324 MR. G. S. WEST ON SOME BRITISH 
Widely distributed, but rarely abundant. Not uncommon 
amongst Sphagnum in peaty pools and bogs; also amongst 
mosses on wet rocks. 
I have noticed a small form of this animal in which the oral 
end of the shell is produced into a neck of considerable length. 
The chitiuous plates composing the shell are also polygonal in 
form and more numerous. Length of shell 63-68 »; breadth of 
shell 28-33 u ; breadth of neck 10-141. Bowness, Westmoreland, 
and Moel Siabod, N. Wales. 
35. QUADRULA IRREGULARIS, Archer, in Qu. Jour. Mier. Sei. 
xvii. 1877, p. 113.—Q. monensis, Cash, in Trans. Manchester 
Micr. Soc. 1891, p. 50, t. 11. ff. 14-16. 
Among mosses in a mountain-stream, Penyghent, W. Yorkshire. 
Length of shell 35 »; breadth of shell 36 u; breadth of mouth 
13 1; thickness 23 p. (Pl. 29. figs. 19, 20.) 
Not more than two or three specimens of this interesting 
species were observed, but the shell is so characteristic and 
its aspect so different from that of Q. symmetrica, that it is 
impossible to confuse them. The plates composing the shell (or 
test) were comparatively regular in outline and arrangement, 
being approximately square and more or less arranged in oblique 
series. It agrees very well with Archer’s description in being 
“smaller than Q. symmetrica, quite without any neck, the ‘mouth’ 
being where a small chord seems, as it were, cut off the globular, 
or perhaps somewhat compressed test, nor are there any ‘lips’ 
nor even any evident thickened margin.” Archer states that the 
plates composing the test are arranged in longitudinal rows, but 
in the few specimens observed the rows of plates were slightly 
oblique. He also says: ‘‘ mouth subcircular in outline,” whereas 
the mouth of the Yorkshire specimens was almost narrowly 
elliptical. This fact is immaterial, however, if the usual allow- 
ance be made for the variation which is so striking a feature of 
the testaceous Rhizopods. The specimens observed were un- 
doubtedly identical with Q. monensis, and, moreover, they also 
agreed with Cash’s description in possessing an elliptical mouth 
and obliquely disposed plates. But as I am firmly convinced 
that Q. monensis is the same species of Rhizopod as that named 
Q. irreqularis by Archer nineteen years previously, the latter 
name takes precedence. 
