48 BRITISH FRESHWATER RHIZOPODA. 



observation when he described 1). proteiformis. Ehren- 

 berg, however, makes no allusion to the characteristic 

 mouth of the latter. . . . The name of D. protei- 

 formis is exceedingly indefinite in its application. It 

 was originally applied by Lamarck, without discrimi- 

 nation, to all the forms figured and described by 

 Leclerc as characteristic of the genus Dijjlugia" 



[Leidy, in proposing for this species the name 

 Diffliigia lobostoma, considered it to be the same as 

 Carter's D. tricuspis from Bombay, but he rightly 

 deemed that name to be inappropriate for a form having 

 an aperture with a varying number of cusps or lobes. 

 If, however, Carter's figures are correct, his species 



FIG. 64. Dijflugia tricuspis Carter. After Carter, loc. cit. x about 280. 



differs in general outline from that which we know as 

 lobostoma, as well as in the form of the aperture and 

 its size in relation to the diameter of the test, so that 

 its reference to that species is very doubtful, and 

 although the name tricuspis was adopted by Mr. Cash, 

 it seems better to use the one by which the species has 

 been universally known for the last thirty-five years. 

 By Averintzev D. tricuspis is referred, with a query, 

 to the next species.] 



19. Difflugia gramen Penard. 

 (Plate XXII, figs. 1 and 2 ; and fig. 64 in text.) 



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



(1856), p. 247, t. vii, f. 80. 



Difflugia lobostoma LEIDY (pars) Freshw. Rhiz. N. Amer. 

 .p. 112, t. xv, f. 15; ?ff. 23, 24. 



