bo 
CO 
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, fies. 5 and 6, and figs. 168 and 169 in text.) 
Parmulina eyathus 
PreNARD Faune Rhiz. Léman (1902), pp. 207-208, 6 figs; Sarcodinés 
in Cat. Invert. Suisse (1905), p. 37; in Arch. Protist. X VII (1909), 
p- 286. 
Waites & PENARD in Proc. R. Ivish Acad. XX XI, txv (1911), 
pp. 9, 18. 
HEInIis in Mém. Soc. Neuchatel, V (1914), pp. 678, 691, 695, 696. 
Epmonpson in Ward & Whittle’s Fresh-water Biology (1918), 
p. 221, f. 285. 
Figs. 168 anp 169.—Parmulina cyathus. Fig. 168, side view. x 650. 
Fig. 169, oral view. x 750. (After Penard.) 
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 sht when the test is folded together, but 
elliptical or circular when the test is ‘expanded ; 
plasma Amoeba-hke, colourless, granular, containing 
food-particles and excretory granules ; nucleus single, 
containing a single nucleoie ; one or more contractile 
vesicles usually present ; pseudopodia not observed, 
