68 BU1TISH FEKSHWATER RH1ZOPODA. 



instead of five ; plasma similar to that of the type but 

 without chromatophores. 



Length 33-42 p.; diameter 21-25/>t; aperture 5-7'S/i,. 



Habitat. Submerged vegetation. 



IEELAND. Glen ties and near Lough Machugh, Done- 

 gal, and Recess, Gralway (West). 



The above are the only recorded occurrences of this 

 form. Judging from the test alone it should be re- 

 garded as a variety only, but if the absence of chroma- 

 tophores should prove to be a constant feature, it might 

 entail such modifications of the methods of nutrition 

 and reproduction as to entitle it to specific rank. 



The aperture of the test is shown circular and not 

 oval as in the type. 



Genus 37. CYPHODERIA Schlumberger, 1845. 



Difflugia (pars) EHRENBERG Ber. Akad. Berlin, 1840, p. 199. 

 CypJtoderia SCHLUMBERGER Ann. Sci. nat. (3) VII (1845), 



p. 254. 

 Lagynis SCHULTZE Organism. Polythalm. (1854) p. 56. 



Test retort-shaped, curved, yellow to colourless, 

 devoid of adherent extraneous matter, formed either 

 of a thin chitinous pellicle covered with discs, or of 

 imbricated scales ; transverse section circular or tri- 

 gonal ; aperture terminal, oblique, usually circular ; 

 plasma grey, granular, partly filling the test, con- 

 taining numerous inclusions; nucleus large, placed 

 posteriorly ; contractile vesicles one or two ; pseudo- 

 podia few, long, filose, simple or branched. 



This genus is closely related to Campascus not only 

 in general appearance but in the characters of the 

 nucleus, the plasma, and the included bodies ; in both 

 genera the nucleus is large, granular, and includes 

 small, bright nucleoles with a hyaline investment; 

 the plasma is greyish, and includes, in addition to the 



