COCHLIOPODIUM OBSCURUM. 67 
Diameter, when contracted 25-30 p, when expanded 
about 50 p. 
Habitat.—Aquatic vegetation. 
Tretanp.—Clare Island, Mayo (Penard). 
The particles covering the central portion of the 
membrane are so closely set that the plasma is quite 
hidden from view ; although their general appearance 
is quite dark, Penard found that isolated particles 
were bright and colourless or of a pale yellow. 
The pseudopodia are somewhat similar to those of 
C. lilimbosum. From other members of the genus 
C. obscurum is distinguished by the numerous adherent 
particles on the test. It should however be remem- 
bered that the genus includes species of very diverse 
characteristics. 
2. Cochliopodium granulatum Penard. 
(Plate LXIII, figs. 10 and 11, and figs. 174 and 175 
in. text.) 
Cochliopodium granulatum 
PENARD in Mém. Soc. Genéve, XX XI (1890), pp. 134-135, pl. iii, 
ff. 23-25; in: Arch. Sci. Nat. (3) XXVI (1891), pp. 138-139; 
in Rev. Suisse Zool. VII (1899), pp. 22-23, pl. ii, ff. 4-5; op. ctt. 
IX, p. 138; Fanne Rhiz. Léman (1902), pp. 194-196, 6 figs. ; 
Sarcodinés Grands Lacs (1905), pp. 11-13, 2 figs.; Sarcodinés in 
Cat. Invert. Suisse (1905), p. 34. 
AVERINTZEFF in Trudui §.-Peterb. Obshch. XX XI, 11 (1906), pp. 139- 
140. 
ScHOUTEDEN in Ann. Biol. lacustre, I (1906), pp. 331, 332. 
Brown in Jrn. Linn. Soc., Zool. XXXII (1911), pp. 77-78, pl. ix, 
ff. 1, 2. 
Test of medium size, not compressed, of variable 
form, hyaline or yellowish in colour, consisting of a 
thin flexible membrane usually sparsely covered with 
extraneous grains; aperture terminal, flexible; plasma 
usually filling the test, grey in colour, granular, con- 
taining numerous vacuoles with sometimes ingested 
diatom-frustules; nucleus single, spherical’ or sub- 
spherical, granular, containing numerous small nucle- 
oles, placed posteriorly; contractile vacuoles one or 
