102 BRITISH FRESHWATER RHIZOPODA. 



all apparently of siliceous substance. It rarely happens 

 that the plates are all circular, 'or all oval ; more fre- 

 quently they are mixed, without order or proportion, 

 and their edges are well defined. 



Examples are occasionally met with which approxi- 

 mate on the one side to N. collar-is and on the other to 

 N. flabellulum, but an acquaintance with the varied 

 peculiarities of these species will usually dispel any 

 difficulty which may be felt in differentiating them. 



Individuals met with in places which are liable to 

 get dried up are generally poor and misshapen. 



91 



FIG. 91. Test of Nebela tincta. Dunham, Cheshire, x 280. 

 FIG. 92. " Difflugia proteiformis " Perty : ? = test of Nebela tincta. 

 After Perty, loc. cit. x 'sOO. 



3. Nebela lageniformis Penard. 

 (Plate XXV, figs. 12-14.) 



Nebela sp. LEIDY Freshw. Rhiz. N. Amer. (1879), p. 160, t. 



xxiv, ff. 18, 19. 

 Nebela lageniformis PENARD in Mem. Soc. Geneve, XXXI 



(1890), 2, p. 158, t. vi, ff. 50-61 ; in Jahrb. nassau. Ver. 



Naturk. XLIII (1890), p. 71 ; Faune Rhiz. Leman (1902), 



p. 355, ff. 1-4 (p. 356) ; in Arch. Protist. II (1903), p. 



259; in Pr. R. Soc. Edinb. XXV (1905), 8, pp. 594, 596; 



and in Jrn. R. Micr. Soc. 1907, p. 278; LEVANDER in 



Acta Soc. Fauna Fenn. XII (1894), 2, p. 20 ; and op. cit. 



XX (1901), 8, p. 9 ; SCHAUDINN in Deutsch-Ost- Africa, 



IV, 2 (1897), 19, p. 10; AVERINTZEV in Trudui S.-Peterb. 



Obshch. XXXVI (1906), 2, p. 246; and in Ann. Biol. 



Lacustre, II, 1 (1907), p. 166; SCHOUTEDEN in Ann. Biol. 



