66 BRITISH FRESHWATER RHIZOPODA. 



ENGLAND. Lancashire (Brown). 



IRELAND. Clare Island, Mayo ; Inishbofin, Gralway. 



Greatly resembling Heleopera petricola var. ame- 

 thyxtea Penard in appearance, this species is dis- 

 tinguished from that variety by its usually larger 

 size and small elliptical aperture ; the test is also 

 characterized by more or less numerous opaque white 

 plates of various shapes incorporated in it. Owing 

 to its opacity little can be distinguished of the animal 

 itself, which is seldom found and then usually in a 

 state of encystment. Although rare it is widely 

 distributed and has been recorded from the Continent 

 of Europe, North and South America, and the 

 Seychelles. 



D. PSEUDONEBELINIE. 



1. Cochliopodium obscurum Penard. 

 (Plate LXII, fig. 14; PL LXIII, figs. 8 and 9.) 



Cochliopodium obscurum 

 PENARD in Mem. Soc. Geneve, XXXI, i, n (1890), p. 135, pi. iii, 



ff. 26-29; in Rev. Suisse Zool. IX (1901), p. 237; Faune Rhiz. 



Leman (1902), pp. 203-206, 6 figs. ; Sarcodines in Cat. Invert. 



Suisse (1905), p. 35. 

 AVERINT/EFF in Trudui S.-Peterb. Obshch. XXXVI. II (1906), 



pp. 140-141. 



SCHOUTEDEN in Ann. Biol. lacustre, I, 3 (1906), pp. 331, 332. 

 WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV( 1911), p. 15. 



Animal covered with a hyaline, elastic membrane, 

 of hemispherical shape when extended with the 

 periphery expanded into a disc-like form, but capable 

 of being closely folded up ; the central portion of the 

 membrane thickly covered with adherent rounded 

 particles ; plasma clear, colourless, granular, usually 

 containing a number of small yellow particles ; nucleus 

 single, containing a single large nucleole ; contractile 

 vesicle large, single ; pseudopodia varying from 

 spatulate to pointed. 



