COCHLIOPODIUM OBSOURUM. 67 



Diameter, when contracted 25-30 /A, when expanded 

 about 50 JJL. 



Habitat. Aquatic vegetation. 

 IRELAND. 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. hilimbosum. From other members of the genus 

 G. obsciirum 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 LXIIL figs. 10 and 11, and figs. 174 and 175 



in text.) 



Cochliopodium granulatum 

 PENARD in Mem. Soc. Geneve, XXXI (1890), pp. 134-135, pi. iii, 



ff. 23-25; in Arch. Sci. Nat. (3) XXVI (1891), pp. 138-139; 



in Rev. Suisse Zool. VII (1899), pp. 22-23, pi. ii, ff. 4-5; op. cit. 



IX, p. 138; Fanne Rhiz. Leman (1902), pp. 194-196, 6 figs.; 



Sarcodines Grands Lacs (1905), pp. 11-13, 2 figs. ; Sarcodines in 



Cat. Invert. Suisse (1905), p. 34. 

 AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXI, n (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, pi. 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 



