82 BRITISH FRESHWATER RHIZOPODA. 



Test with hemispherical or slightly flattened fundus, 

 circular in transverse section ; formed of imbricated 

 bi-convex discs arranged in diagonal rows; plasma and 

 pseudopodia as in the type. 



FIG. 149. Portion of a test of Cyphoderia trochus var. amphoralis. 



x 2000. 



Length 87-153 /x; diameter 38-52 /A ; aperture 

 12-20 p. 



Habitat. Sphagnum, mosses, and aquatic vegeta- 

 tion. 



FIG. 150. Portion of a test of Cyphoderia trochus var. amphoralis. 

 x 2000. a, portion of surface ; b, optical section of same ; c, 

 transverse section. 



ENGLAND. Westmorland ; Isle of Man ; Yorkshire ; 

 Derbyshire (Brown) ; Bedfordshire ; Hampshire ; Isle 

 of Wight. 



WALES. Llyn Crafnant, Carnarvonshire (Hopk.). 



SCOTLAND. Shetlands ; Loch Ness, Inverness-shire 

 (Penard) ; Skye. 



IRELAND. Mayo and the islands off Clew Bay; 

 Wicklow; Kerry. 



