328 MR. G. S. WEST ON SOME BRITISH 
41. EvetypHa mucronata, Leidy, in Proc. Acad. Nat. Sev. 
Philad. 1878, p. 172; Freshw. Rhiz. N. Amer. 1879, p. 219, 
t. xxxvi. ff, 11-14. 
A rare species, which I have only met with amongst Sphagnum 
at Hawkshead, Lancashire. 
One specimen was noticed in which there were two spines, one 
at the extreme apex, and the other some little distance below it. 
Length of shell (without spine) 123 »; breadth 60 p. 
42. HuetyeuHa BracataTa, Letdy, in Proc. Acad. Nat. Sev. 
Philad. 1878, p. 172; Freshw. Rhiz. N. Amer. 1879, p. 200, 
t. xxxvil. ff. 5-10. 
Capel Curig, N. Wales. Small lakes H. of Recess, W. Ireland. 
Length of shell about 120; breadth about 32 p. 
This is another rare species of the genus, which I have only 
obtained twice, and in both instances from submerged Sphagnum. 
It was described by Leidy from New Jersey. 
Gen. Pracocysta, Lezdy. 
43. Pracocysta spinosa, Leidy, Freshw. Rhiz. N. Amer. 1879, 
p- 221, t. xxxviiii—Euglypha spinosa, Carter, in Ann. Mag. Nat. 
Hist. 1865, xv. p. 290, t. xii. f.18; Archer, in Qu. Jour. Micr. 
Sct. 1872, xii. p. 90. 
Somewhatrare. Length of shell 120-127 »; breadth 96-100 p; 
breadth of mouth 50-54 »; thickness about 38 p. 
Scarce in a bog near Bowness, Westmoreland. Hawkshead, 
Lancashire. Llyn Llydaw, Snowdon, N. Wales: dead shells not 
uncommon, but no living avimals seen. It is recorded as occur- 
ring in N. Wales in Qu. Jour. Micr. Sci. 1876, xvi. p, 287, but 
described as “ very rare indeed.” 
The form of the shell and the wide mouth with perfectly smooth 
edges are characters sufficient to distinguish this genus from 
Huglypha. 
Gen. SpHENODERIA, Schlumberger. 
44, SPHENODERIA LENTA, Schlumberger, in Ann. Sct. Nat. 1845, 
p- 256; Leidy, Freshw. Rhiz. N. Amer. 1879, p. 229, t. xxxiv. 
ff. 25-41.—Euglypha globosa, Carter, in Ann. Mag. Nat. Hist. 
1865, xv. p. 290, t. xi. f. 14; Hertwig & Lesser, in Archiv fur 
mikr. Anat. 1874, x. Suppl]. p. 129, t. iui. £. 7. 
Generally distributed throughout the British Islands. The 
