Gephyrea.

1. "History of British Starfishes and other Animals of the Class Echinodermata." Edward Forbes. 1841.

2. "Memoire sur l'Echiure." Quatrefages. 'Annales Sci. Nat.' 1847.

3. "Ueber Thalassema." Krohn. 'Arch, fur Anat. und Physiologic' 1842.

4. "Observationes anatomicae de vermibus quibusdam maritimis."

Muller. 1852.

5. "Larven von Phascolosoma." Selenka. 'Zeitschrift Wiss. Zool.' 1875.

6. "Beitrage zur anatomischen und systematischen Kenntniss der Sipunculiden." Keferstein. 'Zeitschr. fur Wiss. Zool.' 1865.

Annelida.

7. "Monographic de la Famille des Hirudines." Moquin-Tandon. 1846.

8. "De lumbrici terrestris historia naturali, nec non anatomia." Morren. 1829.

9. "Observations on the Organisation of Oligochaetous Annelides."

Ray Lankester. ' Annals of Nat. Hist.' 1871.

10. "Structure of Tubifex." W. C. M'Intosh. 'Trans. Roy. Soc.

'Edin.' 1870-71.

11. Article "Annelides," in Todd's ' Encyclopaedia of Anatomy and Physiology.' Milne-Edwards. 1835.

12. Article "Annelida," in 'Encyclopaedia Britannica,' 9th ed. vol. ii.

W. C. M'Intosh. 1875.

13. " Systeme des Annelides." Savigny. 1820.

14. "Classification des Annelides," etc. Audouin and Milne-Edwards.

'Annales Sci. Nat.' 1832-33.

15. "Etudes sur les types inferieures de l'embranchement des Anneles."

Quatrefages. 'Annales Sci. Nat.' 1848-54.

16. "Histoire Naturelle des Anneles." Quatrefages. 1865.

17. "Zur Anatomie und Physiologie der Kiemenwurmer." Grube. 1838.

18. "Die Familien der Anneliden." Grube. 'Archiv fur Naturgeschichte.' 1850.

19. "Recherches anatomiques sur les Annelides." Claparede. 1861.

20. "Recherches anatomiques sur les Oligochetes." Claparede. 1862.

21. "Structure des Annelides sedentaires." Claparede. 1873.

22. "Die Borstenwurmer." Ehlers. 1864 and 1868.

23. "Nordiske Haf's Annulater." Malmgren. 1866.

24. "Annulata polychaeta Spitzbergiae," etc. Malmgren. 1867.

25. "Catalogue of the British Non-parasitical Worms in the collection of the British Museum." Johnston. 1865-67.

26. "Les Annelides Chetopodes du Golfe de Naples." Claparede. 1868.

Supplement, 1870.

27. "On the Young Stages of a few Annelides." Alexander Agassiz.

'Ann. Lyceum Nat. Hist.' New York. 1866.

28. "Christiania-Fjords Fauna. Anneliden." O. Sars. 1873.

29. "Life-Histories of Animals." Packard. 1876.

30. "Gronland's Annulata dorsibranchiata." Oersted. 'Danske Selsk.

Skriften.' 1843.

Chaetognatha.

31. "Species of Sagitta." Busk. 'Quart. Journ. Microscop. Science.' 1856.

32. "Ueber die Entwickelung der Sagitta." Gegenbaur. 1857.

33. "On a New Species of Sagitta from the South Pacific." Saville Kent. 'Annals Nat. Hist.' 1870.