44 BRITISH FRESHWATER HHIZOPODA. 



the form of its crown and aperture, D. amphoralis 

 seems to be clearly entitled to specific rank. It 

 cannot be called Difflugia amphora, that name having 

 been used by Ehrenberg in 1871. In mentioning only 

 Penard's D. amphora, which is not a variety of D. 

 urceolata, but a distinct and well-marked species, Mr. 

 Cash has apparently overlooked at least one form of 

 Leidy's variety of that name with which D. amplwralis 

 appears to be identical.] 



18. Difflugia lobostoma Leidy.* 



(Plate XXI, figs. 14-17 ; and figs. 58, 59, and 61 

 in text.) 



Difflugia tricuspis CAETEE ? in Ann. Nat. Hist. (2) XVIII 

 (1856), pp. 221, 247, t. vii, f. 80; EHRENBEEG in Abh. 

 Akad. wiss. Berlin, 1871 (1872), p. 264. 



Difflugia oblonga FEESENIDS in Abth. Senkenb. nat. Ges. II 

 (1857), p. 225, t. xii, ff. 43^5; EYPEETH Naturgesch. 

 mikr. Siisswass. ed. 2 (1885), p. 51, t. iii, f. 34. 



Difflugia lobostoma LEIDY (pars) in Pr. Acad. Philad. 1874, 

 p. 79; op. cit. 1877 (1878), p. 307; 1881, p. 10; and 

 Fresh w. Rhiz. N. Amer. (1879), p. 112, t. xv, ff. 1-14, 

 20-24 ; t. xvi, ff. 25-29 ; HITCHCOCK Synops. Freshw. 

 Khiz. (1881), p. 14; TAEANEKHI Sitzber. bohm. Ges. Wiss. 

 1881 (1882), p. 227; DE TAKE in Rep. N. York State 

 Mus. XXXV (1884), p. 166; FIELDE in Pr. Acad. Philad. 

 1887, p. 122; CEETES Prot. in Mission Scient. Cap. Horn, 

 VI (1889), 3, 13; PENAED in Jahrb. nassau. Ver. Naturk. 

 XLIII (1890), p. 70 ; in Mem. Soc. Geneve, XXXI (1890), 

 2, p. 147, t. iv, ff. 72-90, 96 ; in Arch. Sci. nat. (4) VII 

 (1899), p. 253 etc. ; in Rev. Suisse Zool. VIII, 3 (1900), 

 p. 485; and Faune Rhiz. Leman (1902), p. 276, ff. 1-7 

 (p. 277) ; VEEWOEN in Zeits. wiss. Zool. L, 2 (1890), p. 444, 

 t. xviii, and text-ff. a-c; RHUMBLEE in Zeits. wiss. Zool. 

 LII, 4 (1891), p. 547; op. cit. LXI, 1 (1895), p. 44; and 

 in Biol. Centralbl. XVIII (1898), p. 36, f. 2; CASH in Tr. 

 Manch. Micr. Soc. 1891 (1892), p. 48; LEVANDER in 

 Arch. Ver. Mecklenb. XLVII (1892), p. 114; in Acta Soc. 

 Fauna Fenn. XII (1894), 2, p. 16, t. i, ff. 10-13; op. cit. 

 XIX (1900), 2, p. 52; XX (1901), 5, p. 11 etc. ; 6, p. 5; 

 8, p. 8 etc.; and in Zool. Anzeig. XVII (1894), p. 209; 

 * [Difflugia tricuspis Carter : CASH, MS.J 



