28 



BRITISH FRESHWATER RHIZOPODA. 



amended, the author having found that the individuals 

 from which his previous observations had been drawn 

 assumed the hemispherical form owing to their ill 

 health due to the conditions under which they had 

 been examined. Another species, P. obtecta (Gruber) 

 Penard, awaits further investigation. 



1. Parmulina cyathus Penard. 

 (Plate LXI, figs. 5 and 6, and figs. ] 68 and 169 in text.) 



Parmulina cyathus 

 PENARD Faune Rhiz. Leman (1902), pp. 207-208, 6 figs ; Sarcodines 



in Cat, Invert. Suisse (1905), p. 37 ; in Arch. Protist. XVII (1909), 



p. 286. 

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



pp. 9, 18. 



HEINIS in Mem. Soc. Neuchatel, Y (1914), pp. 678, 691, 695, 696. 

 EDMONDSON in Ward & Whittle's Fresh-water Biology (1918), 



p. 221, f. 285. 



168 



169 



FIGS. 168 AND 169. Parmulina cyathus. Fig. 168, side view. 

 Fig. 169, oral view, x 750. (After Penard.) 



650. 



Test 



small, composed of a thick, homogeneous, 

 chitinous, flexible membrane ; ovoid in face view, 

 semicircular in side view ; transverse section ovoid 

 with incurved lip ; the outer surface thickly covered 

 with extraneous particles ; aperture appearing as a 

 long parallel slit when the test is folded together, but 

 elliptical or circular when the test is expanded ; 

 plasma Amoeba-like, colourless, granular, containing 

 food-particles and excretory granules ; nucleus single, 

 containing a single nucleole ; one or more contractile 

 vesicles usually present ; pseudopodia not observed. 



