DIFFLUGIA GRAMEN. 49 



Difflugia gramen Penaed Faune Rliiz. Leman (1902), p. 281, 

 ff. 1-6 (p. 282); AvERiNTZEvin Trudui S.-Peterb. Obshcli. 

 XXXVI (1906), 2, p. 186; Schouteden in Ann. Biol. 

 Lacustre, I, 3 (1906), pp. 341, 345. 



Test resembling that of the preceding species but 

 smaller, and differing from it also in the character of 

 the mouth, which is 3-lobed, the lobes irregular 

 and their extremities quadrangular ; the whole 

 external surface rough with sand-grains ; in face view 

 round, in side view roundly ovate, without neck. 

 Nucleus single ; pseudopodia normal. 



Dimensions : Average length 70 /a ; breadth 55-60 ju,. 



In the ooze of ponds. Frequent in Cheshire. Nant 

 Francon, N. Wales (/. Hopkinson). Loch Ness, Scot- 

 land {D. J. Scourfield). 



This species, which Leidy included imder B. lobo- 

 stoma, differs from what we have regarded as the 

 typical form of that species in the contour of the 

 mouth ; the test also is much smaller, and is generally 

 rough with adhering sand- grains. It is variable in 

 size. Examples are sometimes met with which are 

 semi-opaque, of a purplish-grey colour, and covered 

 with irregular scales, or thin, apparently siliceous, 

 particles, and few sand-grains. Some of these ap- 

 proach nearly to T). limnetica Levander in size, but 

 we have not been able to discover anything like a neck 

 in any examples that we have met with. 



[Penard figures this species with curved as well as 

 with rectangular lobes to the aperture, and Leidy 

 figures a form, which appears to represent it, with a 

 5-lobed aperture (fig. 23, loc. cit.). It may be the case 

 that the number of lobes varies in this species as well 

 as in D. lobostoma and D. corona. ~\ 



20. DiflBugia corona Wallich. 



(Plate XXII, figs. 3-7 ; and fig. 65 in text.) 



Difjluqla vroteiformis sub-sp. globtolaris var. corona Wallicu 



in Ann. Nat. Hist. (3) XIII (1864), p. 241. 

 VOL. II. "i 



