DIPLOCHLAMYS. 31 



vesting the animal and provided with an elastic 

 aperture ; the outer envelope consisting of loosely- 

 aggregated particles of silicious, earthy, or vegetable 

 materials, the aperture large, partially or completely 

 closed by the inner membrane ; plasma clear, granular, 

 containing various inclusions consisting usually of 

 food-particles, excretory granules, and occasionally 

 crystals ; nuclei varying in number from one to one 

 hundred or more ; contractile vesicles usually present ; 

 pseudopodia few, short, digitate or pointed. Multi- 

 plication takes place by division. 



'For a detailed account of this genus, Penard 

 ('Archiv. f. Protist,,' 1909) should be consulted ; five 

 species are described, three of which have been 

 recorded from Great Britain. U. fragilix Penard and 

 D. grnberi Penard have not, up till now, been recorded. 



SYNOPSIS or THE BRITISH SPECIKS. 



Test cup-shaped, dark grey in colour; nuclei varying from 

 one to twenty in number. (1) D. leidyi. 



Test approximately hemispherical, about 45 /i in diameter; 

 nucleus single, 7'5-10 ft in diameter. (2) D. timida. 



Test approximately hemispherical, about 100 ju in diameter ; 

 nuclei usually over 100 in number and 3'5 // in diameter. 



(3) D. vestita. 



1. Diplochlamys leidyi Greeff. 

 (D. fragilis, Plate LX, fig. 5.) 



Diplochlamys leidyi 



GREEFF in Sitz'b. Ges. nat. Marburg, III (1888), pp. 104-106. 

 AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXVI, n (1906), 



p. 165. 



SCHOUTEDEN in Ann. Biol. lacustre, I, 3 (1906), p. 338. 

 PENARD in Arch. Protist. XVII, 2 (1909), pp. 270-272, 274, 275; in 



Brit. Antarct. Exped. I, Biology, 6 (1911), pp. 220, 232. 

 WAILES & PENARD in Proc. E. Irish Acad. XXXI, LXV (1911), 



pp. 9, 16. 



Test hemispherical or cup-shaped, dark grey in 

 colour, the exterior covered with fine silicious grains 

 and earthy particles ; the inner membrane clearly 



