BHTNCHOGROMIA NIGKICANS, 143 



Bhynnhogromia nigricans 



Rhtjmblee in Arch. Pi-otist. Ill (1903), p. 213, f. 32. 

 Pbnabd Sarcodines in Oat. Invert. Suisse (1905), p. 122. 

 Atbeintzefp in Trudui S.-Peterb. Obshch. XXXYI, ii (1906), p. 329. 

 ScHOTiTEDEN in Ann. BioL laoustre, I (1906), pp. 375, 376. 



Test large, elongated, flexible, covered with a thick 

 layer of small extraneous particles ; transverse section 

 circular ; aperture terminal ; plasma completely filling 

 the test, clear, granular, containing numerous inclusions ; 

 nucleus usually single (occasionally two or three), con- 

 taining niimerous nucleoles ; pseudopodia numerous, 

 anastomosing, arising from a peduncle. 



Length 220 ju- or more, sometimes attaining 400 jx. 



Habitat. — Submerged mosses and lakes. 



Scotland. — Loch Ness, Inverness-shire ; depth 

 300-400 feet (Penard). 



This species is distinguished from Bhynchogromia 

 linearis Penard by its more robust form and the char- 

 acter of the test ; from B. squamosa Penard by the 

 characters of the nucleus and of the test. The peduncle 

 is obscure and difiicult to distinguish. As first des- 

 cribed by Penard the test was of a blackish colour, but 

 specimens found subsequently had a brownish tinge ; 

 no information is available as to the exact colour of 

 the individuals, four in number, found in Loch Ness ; 

 they were observed in a living state. 



Family 4. Amphistomina. 



Test spherical or oval, consisting of a chitinous 

 membrane either smooth or encrusted with adherent 

 particles, furnished with two apertures situated at 

 opposite poles; nucleus single, placed centrally; pseudo- 

 podia filose, radiating, straight or branched, but not 

 anastomosing. 



The genus Diplophrys, although placed in the same 

 family, beyond possessing two apertures in the test, 

 has no aflBnity with the genus Amphitrema. 



