DIPLOPHltYS AECHEEI. l-i5 



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

 BuETSCHLi in Bronn's Thien-eichs, 1, 1 (1880), pL iv, f. 2 a, b. 

 Hitchcock Synops. Preshw. RMz. (1881), p. 47. 

 Tabanbk in Sitzb. bobm. Ges. Wiss. 1881, pp. 224, 235. 

 Lankestbe in Encycl. Brit., ed. 9, XIX (1885), p. 845, fE. 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. Thiert., ed. 3, II (1886), p. 1169, f. 1153. 

 Penaed in Jahrb. nassau. Yer. Naturk. XLII (1889), p. 144 ; op. cit. 



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



189, pi. xi, fe. 37-63 ; Faune Rhiz. Leman (1902), pp. 540-643, 2 



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



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

 liOBD in Trans. Manoh. Micr. Soc. 1891 (1892), p. 56. 

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

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

 ScHEWiAKorF in Mem. Acad. St. Petersb. (7) XLI (1893), vili, p. 98. 

 Zachabias in Forscbb. 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. 



Oentralbl. XIX (1899), p. 144. 

 Dblage & Heboitaed Traite Zool. concrete, I (1896), p. 116, f. 163. 

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

 ScHArDiSTN in Deutsch-Ost- Africa, IV, xvii (1897), p. 11. 

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

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

 VP'BST in Jm. Linn. Soc, Zool. XXVIII (1901), p. 332 ; op. cit. XXIX 



(1903), p. 116. 

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

 HoosENEAAD in Tljds. Nederl. Dierk. Ver. (2) X (1908), pp. 417-419, 



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

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



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

 Badat in Deutsch-Ost- Africa, IV, xxiii (1910), p. 11. 

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

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

 Wailbs & Penaed in Proc. R. Irish Acad. XXXI, Lxv (1911), 



p. 59. 

 Wailbs in Jm. 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. 



VIII. 10 



