56 BRITISH FRESHWATER JEIHIZOPODA. 



Plon, I (1893), p. 3; and oj). cit. II (1894), p. 57; 

 ZscHOKKE in Verb. nat. Ges. Basel, XI, 1 (1895), p. 59 

 etc.; Daday in Termesz. Fiizetek, XX (1897), p. 153; 

 and Of. cit. XXI (1898), Suppl. pp. 5, 9; France in Ees. 

 wiss. Brforsch. Balatons. II \\S91), 1, pp. 3, 8 ; Fbenzel 

 in Bibl. Zool. IV, 12 (1897), p. 148, t. ix, f. 7; Fdhe- 

 MANN in Rev. Suisse Zool. IV (1897), p. 494 etc. ; Schau- 

 DiNN in Deutsch-Ost- Africa, IV, 2 (1897), 19, p. 9; 

 ScouEFiELD in Pr. Zool. Soc. 1897, p. 787; Andee in 

 Jaliresb. nat. Ges. Graubiind. XLI (1898), p. 57 etc. ; 

 Steneoos in Acta Soc. Fauna Fenn. XVII (1898), 1, pp. 35, 

 81; AvEEiNTZEV in Trudui S.-Peterb. Obshch. XXX, 1 

 (1900), p. 209 ; o-p. cit. XXXVI (1906), 2, p. 216 ; in Ber. 

 Siisswass. nat. Ges. Sb. Petersb. I (1901), p. 212; and in 

 Zool. Anzeig. XXXI (1907), pp. 244, 309 ; Byfeeth Natur- 

 gescb. mikr. Siisswass. ed. 3 (1900), p. 268 ; Godet in Bull. 

 Soc. Neuchatel, XXVIII (1900), p. 77; Lagerheim in Forh. 

 Geol.Poren. Stockholm, XXIII, 6 (1901), p. 510 etc. ; and 

 02>. cit. XXIV (1902), p. 246 etc. ; G. S. West in Jrn. Linn. 

 Soc, Zool. XXVIII (1901), p. 317; and in Ann. Scott. Nat. 

 Hist. 1905, p. 89; Beaedsley in Tr. Amer. Micr. Soc. 

 XXIII (1902), p. 57 ; KoFOiD in Bull. Illinois State Lab. 

 VI, 2 (1903), p. 526; Zykoff in Bull. Soc. Nat. Moscou, 

 XVII (1903), p. 16 ; FoEEL Le Leman, III (1904), p. 138 ; 

 CusHMAN in Ainer. Natur. XL (1906), p. 172; Edmonston 

 in Pr. Davenport Acad. Sci.XI (1906), p. 14, t. iii, f. 14; 

 ScHORLEE & Thallwitz in Ann. Biol. Lacustre, I, 2 (1906), 

 p. 260; ScHouTEDEN in Ann. Biol. Lacustre, I, 3 (1906), pp . 

 340, 348; Thiebaqd in Zool. Anzeig. XXIX (1906), p. 796; 

 MnERAY in Ann. Scott. Nat. Hist. (1907), p. 94 ; Le Roox 

 in Ann. Biol. Lacustre, II, 1 (1907), p. 264; Zschokke in 

 Arcli. Hydrobiol. II (1907), 1, p. 4; Schneider in Arch. 

 Biontol. II, 1 (1908), p. 58. 



Difflugia marsiqnformis Butschli in Bronn's Thier-Eeichs, 

 I, 1 (1880), t. iii, ff. 2, 3; Penard in Jahrb. nassau. Ver. 

 Natiirk. XLIII (1890), p. 70; and in Rev. Suisse Zool. 

 XXXI (1890), 2, p. 143, t. iv, tt'. 30-33; Lagerheim in 

 Forh. Geol. Foren. Stockholm, XXIII (1901), p. 512. 



Difflugia [Arcella) constricta Certes in Mission scient. Cap. 

 Horn, VI, 3 (1889), p. 13. 



Difflugia platystoma Penard in Rev. Suisse Zool. XXXI 

 '(1890), 2, p. 143, t. iv, ff. 35-37. 



Test very variable in size and form, distinguished 

 from other species by its antero-inferior mouth, the 



