The protoplasm has the form of a sticky network, which shows amoeboid motion, and takes up foreign bodies. A similar organism, known by the name of Bathybius Haeckelii, was supposed by several authorities to cover the bottom of the deep sea with a living network of protoplasm. It has been recently determined to be a colloid precipitate of Calcium sulphate, thrown down from the sea-water by the action of Alcohol on the specimens of sea-bottom in which it was found.

Two remarkable Protozoan parasites recently discovered may be mentioned here. One has been found in the sputum of whooping-cough. It has the form of a nucleated cell rounded at one end, drawn out into a point at the other. The rounded end may emit fine pseudopodia. It appears to feed on the leucocytes of the sputum, and passes into a resting phase in which it is so curved that the two ends touch or nearly touch each other. The other parasite, Schizogenes, inhabits the coelome of certain Ostracoda and Cladocera. It is composed of a homogeneous protoplasm and is non-nucleated. In size and shape it is very variable. The smallest individuals are rounded discs. Its mode of reproduction is peculiar. A split occurs in the protoplasm which slowly cuts off a portion.

Heliozoon-like genera. Nudearia, Cienkowski, A. M. A. i. 1865, p. 225-6, = Heterophrys varians, F. E. Schulze, ibid. x. 1874, p. 386, = Heliophrys variabilis, Greeff, ibid. xi. 1875, p. 28; cf. Leidy, 'Freshwater Rhizopoda of N. America,' U. S. Geological Survey of the Territories, Washington, 1879, p. 243. Myxastrum radians, Haeckel, J. Z. iv. 1868, p. 91; M. Liguricum, Gruber, Nova Acta, xlvi.

1884, p. 505. Archerina, E. Ray Lankester, Q. J. M. xxv. 1885. Monobia, Schneider, A. Z. Expt. vii. 1878. Myxodyctium, Haeckel, op. cit. p. 99.

Monadineae. Zopf, Encyclopaedic der Naturwissenschaften, Breslau, 'Hand-buch der Botanik,' iii. pt. 2, 1884 1.

M. zoosporeae: Zopf, op. cit. pp. 115-31. Pseudospora maligna, Protomonas atnyli, Diplophysalis stagnalis, D. Nitellarum, Gymnococcus Fockei, Aphelidium deformans. Zopf, 'Zur Morphologie und Biologie der niederen Pilzthiere,' Leipzig, 1885. Colpodella pugnax, Cienkowski, A. M. A. i. 1865, p. 214. Protomonas amyli, Cienkowski, op. cit. p. 213; P. Huxleyi, Haeckel, J. Z. vi. 1871, p. 29; P. Spirogyrae, Fisch, Z. W. Z. xlii. 1885, p. 119. Diplophysalis (= Pseudospora) Nitellarum, Cienkowski, op. cit. p. 213; D. (=\ P.) Volvocis, Id. ibid. p. 214. Pseudosporidium, Brass, Biol. Studien, i. 1883-4, p. 70. Protomyxa, Haeckel, J. Z. iv. 1868, p. 71. Plasmodiophora, Woronin, Pringsheim's Jahrbiicher, xi. p. 548. Tetramyxa, Goebel, Flora, No. 23, 1884.

* M. azoosporeae. Zopf, op. cit. pp. 99-115. Vampyrella Spirogyrae, V. variabilis, V. pendula, Leptophrys vorax, Zopf. 'Zur Morphologie,' etc, supra. Spiro-phora (= Amoeba) radiosa, Auerbach, Z. W. Z. vii. 1855-6, p. 400; Biitschli, Z. W. Z. xxx. 1878, p. 271; = Dactylosphaerium vitreum(?), Hertwig and Lesser, A. M. A. x. 1874, Suppl. p. 55. Haplococcus, Zopf, Biol. Centralblatt. iii. 1883-4, p. 673. Vampyrella Spirogyrae, Cienkowski, A. M. A. i. 1865, p. 218; Hertwig and Lesser, op. cit. p. 61; Leidy, op. cit. supra, p. 253; V. pendula, Cienkowski, op. cit. p. 221; V. variabilis, V.pedata, Klein, Botan. Centralblatt. xi. pp. 189, 204-8, 257-9; V. polyblasta, Sorokin, Grundzilge der Mycologie, p. 495; V, Gomphone-matis, Haeckel, J. Z. vi. 1871, p. 23. Leptophrys= Vampyrella vorax, Cienkowski, op. cit. p. 223; Id. ibid. xii. 1876, p. 24; L. cinerea, L. elegans, Hertwig and Lesser, op. cit. p. 57; cf. Archer, Q. J. M. xvii. 1877, p. 345. Bursulla, Sorokin, A. Sc. N. Botan. (6), iii. 1876, p. 40.

Amoeboid genera. Boderia, Strethill Wright, Journal of Anat. and Physiol. i. 1867, p. 335. Gymnophrys, Cienkowski, A. M. A. xii. 1876, p. 31; cf. Archer.

1 All or nearly all the genera and species are described in this work, some indeed only in it. To certain genera and species references are given which may prove useful to those to whom Zopf's work is inaccessible.

Q. J. M. xvii. 1877, p. 348. Biomyxa, Leidy, op. cit. supra, p. 281; Gruber, Nova Acta, xlvi. p. 503. Protamoeba, Haeckel, J. Z. iv. 1868, p. 104; vi. 1871, p. 32; Gruber, op. cit. p. 483; Korotneff, A. Z. Expt. viii. 1879-80, p. 467 j Meresch-kowski, A. M. A. xvi. 1879, p. 214 (? does his species = Polymastix sol of Gruber, op. cit. p. 508; it is much smaller); Trinchesi, Mem. Accad. Bologna (4), v. 1884. Gloidium, Sorokin, M. J. iv. 1878. Protogenes, Haeckel, Z. W. Z. xv. 1865, p. 360; Trinchesi, op. cit. Arachnula, Cienkowski, A. M. A. xii. 1876, p. 27; cf. Archer, Q, J. M. xvii. p. 347. Monopodium, Mereschkowski, Z. A. iii. 1880, p. 139. Aletium, Trinchesi, op. cit. and Rendic. Accad. Sc. 1st. Bologna, 1880-1, p. 134. Protobathybius, Bessels, J. Z. ix. 1875, P. 277,note I• Bathybius, Huxley, Q. J. M. viii. 1868; Haeckel, J. Z. v. 1870, p. 499; Gumbel, Neues Jahrbuch fur Min. Geol. Palaeont. 1870, p. 753; Murray, P. R. S. xxiv. 1876, p. 530; Buchanan, ibid. p. 605; cf. Wyville Thomson, 'Depths of the Sea,' 1873, p. 411; Haeckel, Kosmos, i.

Parasite of whooping-cough, Deichler, Z. W. Z. xliii. 1886. Schizogenes, Moniez, Journal de l'Anat. et Physiol. (Robin), xxii. 1886.