74 BRITISH I'EESHWATEJi RHIZOPODA. 



Test yellow, or rarely colourless, translucent,- com- 

 posed of non-imbricated discs usually arranged in 

 diagonal rows on a thin chitinous pellicle ; transverse 

 section circular; aperture circular, placed obliquely, 

 with a curved neck; plasma grey, partly filling the 

 test, containing many granules and food-particles; 

 nucleus large, granular, containing numerous nucleoles 

 and placed posteriorly; one large and one smaller 

 contractile vesicle usually present; pseudopodia fili- 

 form, attenuate, long, straight or curved. 



Fia. 140. — Portions of tests of Cyphoderia ampulla, x 2000. i>, with 



section. 



m 



Fig. 141. — Portions of tests of the same. * 2000. 



Length 61-190 fi (usually 100-140 ja) ; diameter 33- 

 72 IX ; aperture 10-22 ju,. 



Habitat. — Wet mosses, sphagnum, and aquatic 

 vegetation. 



England. — Cumberland (Brown) ; Westmorland 

 (West, Brown); Lancashire {Gash) ; N. and W. York- 

 shire ; Isle of Man ; Cheshire {Cash) ; Derbyshire 

 (Brown); Warwickshire (Boltuii); Bedfordshire; Essex 

 (Scourfield) ; Surrey [West). 



Wales. — North Wales ! (Gash). Snowdon, Carnar- 

 vonshire, 3000 feet (West). 



Scotland. — Shetlands and Orkneys! (West); St. 



