DIPLOFHUYS ARCHEEI. 145 



LEIDY Freshw. Rhiz. N. Amer. (1879), pp. 256-258. 

 BUETSCHLI in Bronn's Thien-eichs, I, 1 (1880), pi. iv, . 2 a, b. 

 HITCHCOCK Synops. Freshw. Rhiz. (1881), p. 47. 

 TARANEK in Sitzb. bohm. Ges. Wiss. 1881, pp. 224, 235. 

 LANKESTER in Encycl. Brit., ed. 9, XIX (1885), p. 845, ff. ix, 1 ; in 



Zool. Art. contrib. Encycl. Brit. (1891), p. 16, f. ix, 1. 

 BLOCHMANN Mikr. Thierw. Siisswass. (1886), p. 15, pi. i,'f . 36 ; ed. 2 



(1895), p. 20, pi. ii, f. 29. 



LTJDWIG in Leunis' Synops. Thierk., ed. 3, II (1886), p. 1169, f. 1153. 

 PENARD in Jahrb. nassau. Ver. Naturk. XLII (1889), p. 144 ; op. cit. 



XLIII (1890), p. 72 ; in Mem. Soc. Geneve, XXXI, ii, i (1890), p. 



189, pi. xi, ff. 37-63; Faune Rhiz. Leman (1902), pp. 540-543, 2 



figs. ; Sarcodines grands Lacs (1905), pp. 108-117 ; Sarcodines in 



Cat. Invert. Suisse (1905), p. 114. 

 LORD in Trans. Manch. Micr. Soc. 1891 (1892), p. 56. 

 ZOPF Beitr. nieder. Organism. (1892), p. 46. 

 CERTES in Bull. Soc. zool. France, XVIII (1893), p. 114. 

 SCHEWIAKOFF in Mem. Acad. St. Petersb. (7) XLI (1893), vin, p. 98. 

 ZACHARIAS in Forschb. Plon, I (1893), p. 3 ; op. cit. II (1894), p. 57 ; 



V (1897), p. 113 ; in Zool. Anzeig. XXII (1899), pp. 50, 51 ; in Biol. 



Centralbl. XIX (1899), p. 144. 



DELAGE & HEROUARD Traite Zool. concrete, I (1896), p. 116, f. 163. 

 FRANCE in Res. Erforsch. Balatons. II, i (1897), p. 11. 

 SCHAUDINN in Deutsch-Ost- Africa, IV, xvn (1897), p. 11. 

 EYFERTH Einfach. Lebensf., ed. 3 (1900), p. 271. 

 GODET in Bull. Soc. Neuchatel, XXVIII (1901), p. 78. 

 WEST in Jrn. Linn. Soc., Zool. XXVIII (1901), p. 332 ; op. cit. XXIX 



(1903), p. 116. 



SCHARFF in Irish Natur. XI (1902), p. 26. 

 HOOGENRAAD in Tijds. Nederl. Dierk. Ver. (2) X (1908), pp. 417-419, 



424 ; in Ann. Biol. lacustre, III (1908), p. 256. 

 BROWN in Naturalist, 1909, p. 108 ; in Brit. Assoc. Handb. Sheffield 



(1910), p. 501 ; in Ann. Scott. Nat. Hist. 1911, p. 229. 

 DADAY in Deutsch-Ost-Africa, IV, xxm (1910), p. 11. 

 HOPKINSON in Irish Natur. (1910), pp. 3, 4. 

 HARTOG in Encycl. Brit., ed. 11, XXIII (1911), p. 248, f. 7 (1). 

 WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV (1911), 



p. 59. 

 WAILES in Jrn. Linn. Soc., Zool. XXXII (1913), p. 209. 



Habit colonial or solitary ; body spherical, invested 

 with a delicate hyaline membrane provided with two 

 apertures situated at or near two opposite poles ; 

 plasma colourless, transparent, finely granular, filling 

 the envelope except near the two apertures; nucleus 

 single, containing a single nucleole ; several pulsating 

 vesicles usually present; one large, or two or three 

 small, coloured, oil-like globules always present; 

 pseudopodia extremely attenuate, radiating, straight 

 or dichotomously branched, emanating from each aper- 

 ture ; reproduction by fission or tetrad division. 



vin. 10 



