36 BRITISH FRESHWATER RHIZOPODA. 
Encianp.—Isle of Man; N. Yorkshire; Cambridge- 
shire; Bedfordshire; Shropshire; Buckinghamshire ; 
Somersetshire ; Devonshire. 
Wates.—Anglesey. 
Scortanp.—Orkney Islands; Dumfries. 
IreLanp.—Inishbofin, Galway; Clare Isl., Achill Isl., 
and Caher Isl., Mayo; Kerry. 
The hemispherical test, with the large, slightly- 
invaginated aperture, serve to identify this species 
with ease. The. internal prolongation of the mem- 
brane around the aperture towards the crown, usually 
present in members of this genus, is entirely wanting. 
Although not uncommon, only a few individuals 
have been observed in a living state and none with 
their pseudopodia ‘extended. 
§ B. Dirrivernz. 
1. Difflugia oblonga var. tenuis Penard. 
(Plate LXI, fig. 8.) 
Diflugia pyrifermis var. tenuis 
PrenaRD in Mém. Soc. Genéve, XXXI, i, 1 (1890), p. 138, pl. iii, 
ff. 47-49. 
Difflugia oblonga var. tenwis 
Waites & PENARD in Proc. R. Irish Acad. XXXI, txv (1911), 
pp. 16, 34. 
Test similar to that of the type in form, but smaller 
and usually transparent ; fundus frequently angular; 
plasma and pseudopodia normal. 
Length 40-60 «4; diameter 20-35 p. 
Halitat.—Aquatic vegetation. 
IreLanp.—Achill Island and Louisburgh, Mayo 
(Penard). 
Penard (1890) describes the occurrence, on the 
fundus of the tests of this variety, of small rod-like 
parasites, but they appear to have been merely 
accidental. 
