66 BRITISH FRESHWATER RHIZOPODA. 
Enetanp.—Lanceashire (Brown). 
Iretanp.—Clare Island, Mayo; Inishbofin, Galway. 
Greatly resembling Heleopera petricola var. ame- 
thystea Penard in appearance, this species is dis- 
tinguished from that variety by its usually larger 
size and small elliptical aperture; the test 1s 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. PsEuDONEBELINA. 
1. Cochliopodium obscurum Penard. 
(Plate LXIT, fig. 14; Pl. LXIII, figs. 8 and 9.) 
Cochliopodium obscurum 
PENARD in Mém. Soc. Genéve, XXXI, i, 11 (1890), p. 135, pl. iii, 
ff. 26-29; in Rev. Suisse Zool. IX (1901), p. 2387; Faune Rhiz. 
Léman (1902), pp. 203-206, 6 figs.; Sarcodinés in Cat. Invert. 
Suisse (1905), p. 35. 
AVERINIZEFF in Trudui §.-Peterb. Obshch. XXXVI, 11 (1906), 
pp. 140-141. 
ScHOUTEDEN in Ann. Biol. lacustre, I, 3 (1906), pp. 331, 332. 
WaliLes & PENARD in Proce. R. Irish Acad. XX XI, txv(1911), p. 15. 
Aninhal covered with a hyaline, elastic membrane, 
of hemispherical shape when extended with the 
periphery expanded into a disc-like form, but ¢apable 
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. 
