[In the subjoined list, as well as in those which will be subsequently given, it is hardly necessary to say that nothing further will be attempted than to furnish the student with a brief and limited selection from the numerous works and memoirs relating to the animals belonging to each sub-kingdom. It has also not appeared needful to cite the names of well-known manuals and text-books of zoological science, save where these contain special information.]

General Works

1. "Die Klassen und Ordnungen des Thier-Reichs," vol. i. Amorphozoa.

Bronn.

2. "Manual of the Protozoa." Greene.

3. "Micrographic Dictionary." Griffiths and Henfrey.

4. "The Microscope and its Revelations." 5th ed., 1875. Carpenter.

5. "Life-Histories of Animals." Packard.

6. "Recent Researches among some of the more Simple Sarcode Organisms." 'Journ. Linn. Soc.,' vol. xiii., 1877. Allman.

Gregarinida.

7. "Icones Histiologicae," vol. i. p. 7. Kolliker.

8. "Ueber die Natur der Gregarinen." ' Midler's Archiv fur Anatomie,'

1848. Stein.

9. "On a new Species of Gregarina to be called Gregarina gigantea."

'Quart. Journ. Microscop. Science,' vol. x., 1870. Van Beneden.

Monera.

10. "Monographic der Moneren." 'Jenaische Zeitschrift fur Medecin und Naturwiss.,' vol. iv., 1868. (Translated in 'Quart. Journ. Microscop. Science,' 1869.) Haeckel.

11. "Beitrage zur Kenntniss der Moneren." Schultze's ' Archiv fur Mikroscopische Anat.,' vol. i., 1865. Cienkowski.

* "Fossil Infusoria" are often spoken of as forming more or less extensive deposits in the earth's crust, but the organisms so named are really Diatoms and Polycystina.

Amoebea.

12. "Etudes sur les Infusoires et les Rhizopodes," vol. i. p. 413. Claparede and Lachmann.

13. "Ueber die Einzelligkeit der Amoeben." 'Zeitschrift fur Wiss.

Zoologie,' 1855. Auerbach.

14. "On some Fresh-water Rhizopods." 'Quart. Journ. Microscop.

Science,' 1869-71. Archer.

15. "Fresh-water Rhizopods." ' Annals of Nat. Hist.,' ser. 3, vol. xiii., 1864. Carter.

16. "Amoeba villosa," etc. 'Annals of Nat. Hist.,' ser. 3, vol. xi., 1863.

Wallich.

17. "Ueber Rhizopoden und denselben nahestehende Organismen." 'Archiv fur Mikr. Anat.,' vol. x., suppl. 1874. Hertwig and Lesser.

18. "Rhizopoden-Studien." ' Archiv fur Mikr. Anat.,' vol. xi., 1875. F. Eilhard Schultze.Foraminifera.

19. "Introduction to the Study of the Foraminifera" ('Ray Society'), 1862. Carpenter.

20. "Ueber den Organismus der Polythalamien." 1854. Schultze.

21. "On the Recent Foraminifera of Great Britain" ('Ray Society'), 1858. Williamson.

22. "Researches on the Foraminifera." 'Phil. Trans.,' 1856-57. Car' penter.

23. "Handbuch der Palaeontologie," vol. i. pp. 61-114, 1876. Zittel.

24. "Carboniferous and Permian Foraminifera" (with a general Introduction). 'Monographs of the Palaeontographical Society,' 1876. H. B. Brady.

25. "Mikrogeologie." Ehrenberg.

26. "Foraminiferes Fossiles du Bassin Tertiaire de Vienne." D'Orbigny.

27. "Ueber den Kern der Foraminiferen.' 'Archiv fur Mikr. Anat.,'

1876. F. Eilhard Schultze.

28. "Reticularian Rhizopoda of the Challenger Expedition." 'Quart.

Journ. Micr. Science,' vol. xix., 1879. H. B. Brady.

Radiolaria.

29. "Ueber die Thalassicollen, Polycystinen, und Acanthometren des Mittelmeeres." ' Abhandl. d. K. Akad. Berlin,' 1858 (also m ' Quart. Journ. Microscop. Science,' 1859). J. Muller.

30. "Die Radiolarien," 1862. Haeckel.

31. "Mikrogeologie." Ehrenberg.

32. "Fortsetzung der Mikrogeologischen Studien," etc. ' Abhandl. d.

K. Akad. Berlin,' 1875. Ehrenberg.

33. "On Thalassicolla." ' Annals of Nat. Hist.,' 1851. Huxley.

34. "Actinophrys sol." 'Quart. Journ. Microscop. Science,' 1853.

Kolliker.

35. "Heliozoa." 'Quart. Journ. Microscop. Science,' 1876, 1877.

Archer.

36. "Recent Researches on the Radiolarians." 'Journ. Linn. Soc.,' vol.

xiv., 1878. St George Mivart.

37. "Ueber Radiolarien, etc, des sussen Wassers." 'Archiv fur Mikr.

Anat.,' 1869. Greeff.

Spongida.

38. "Observations and Experiments on the Structure and Functions of the Sponges." ' Edin. Phil. Journ.,' vols. xiii., xiv.; and Edin. New Phil. Journ.,' vol. i., 1825-27. Grant.

39. "Anatomy and Physiology of the Spongiadae." 'Phil. Trans.,'

1859. Bowerbank.

40. "British Spongiadae" ('Ray Society'). Bowerbank.

41. "History of British Sponges and Lithophytes." Johnston. 1842.

42. "Die Spongien des Adriatischen Meeres," 1862-66. Oscar Schmidt.

43. "Grundziige einer Spongien-Fauna des Atlantischen Gebietes," 1870. Oscar Schmidt.

44. "Die Kalk-Schwamme." Haeckel. 1872.

45. "Anatomy and Classification of Sponges." ' Annals of Nat. Hist.,'

1875. Carter.

46. "Vitreous Sponges," 'Annals Nat. Hist.,' 1868. Wyville Thomson.

47. "Classification of Sponges." ' Proc. Zool. Soc.,' 1867., Gray.

48. "Development of the Marine Sponges." 'Annals Nat. Hist.,'

1874. Carter.

49. "Development of the Calcispongiae." 'Annals Nat. Hist.,' 1875.

(Translation.) Metschnikoff.

50. "The Spongiae ciliatae as Infusoria flagellata." 'Annals Nat. Hist.,'

1868. James-Clark.

51. "The Depths of the Sea," 1873. Wyville Thomson.

52. "On Holtenia." 'Phil. Trans.,' 1870. Wyville Thomson.

53. "On Cliona." 'Annals. Nat. Hist.,' 1849. Albany Hancock.

54. "Ventriculitidae of the Chalk." 'Annals Nat. Hist.,' 1847, 1848. Toulmin Smith.

55. "Untersuchungen liber Hexactinelliden." 'Zeitschr. fur Wiss. Zool.,'

vol. xxv., 1877. W. Marshall.

56. "Handbuch der Palaeontologie," vol. i., part 2, 1879. Zittel.

57. "Beitrage zur Systematik fossiler Spongien." 'Neues Jahrb. fur Min. Geol. und Paleont.,' 1877, 1878. Zittel.

58. "On Haeckel's Group of the ' Physemaria,' and on the Affinities of the Sponges." ' Ann. Nat. Hist.,' ser. 5, vol. i., 1878. Saville Kent.

59. "On the genus Haliphysema." 'Ann. Nat. Hist.,' ser. 5, vol. i., 1878. A. M. Norman.

Infusoria.

60. "Die Infusionsthierchen als volkommene Organismen," 1838. Ehrenberg.

61. "Infusoires," 1841. Dujardin.

62. "Der Organismus der Infusionsthiere," 1867. Stein.

63. "Etudes sur les Infusoires et les Rhizopodes." 'Mem. de l'lnstitut National Genevois,' 1858-61. Lachmann and Claparede.

64. "Recherches sur les organes generateurs et la reproduction des Infusoires." 'Comptes Rendus,' 1858. Balbiani.

65. "Untersuchungen uber den Bau und die Naturgeschichte der Vorticellen." ' Archiv fur Naturg.,' 1870. Greeff.

66. "Zur Morphologie der Infusorien." 'Jenaische Zeitschrift,' vol. vii., 1873. Haeckel.

67. "Ueber einige neue pelagische Infusorien." 'Jenaische Zeitschrift,'

vol. vii., 1873. Haeckel.

68. "History of Infusoria." Pritchard.

69. "Recent Progress in our Knowledge of the Ciliate Infusoria."

'Proc. Linn. Soc.,' 1875. Allman.

70. "Flagellate Infusoria." ' Annals Nat. Hist.,' 1868. James-Clark.

71. "Beitrage zur Kenntniss der Monaden." 'Archiv fur Mikr. Anat.,'

1865. Cienkowski.

72. "Researches on the Life-History of the Monads." ' Monthly Micr.

Journ.,' vols, x.xiii., 1873-75. Dallinger and Drysdale.