PULMONATA. 91 
No. 39. Limnawa tTumipA. Ff. #. Hdwards. Tab. XIII, fig. 6 a—4é. 
L. testa ovato-acutd, ventricosd, sexies vel septies circumvolutd ; spird elevatd, apice 
acuminato ; anfractibus convexis, ultimo tumido: apertura ovata, ampla, bessem totius teste 
in longitudinem fere equanti ; margine columellari reflexo ; plicd parum tortuosd, eminenti, 
rotundatd, in medio sub-callosd. 
An ovate, ventricose shell, with an elevated, pointed, rather subulate, spire ; 
volutions six or seven, the early ones increasing in size slowly, the last two more 
rapidly; the upper parts forming the sides of the spire are rather flattened, as in 
L. pyramidalis; the body whorl large and tumid. The aperture is ovate, and in 
length nearly equal to two thirds of the whole shell; the anterior margin, where it 
joins the columella, is slightly reflected; the columella itself is not much twisted, and 
the fold is prominent, round, and thickened towards the middle. 
This species may be distinguished from Z. gzbdosula, by the round columellar fold 
and longer spire; and from Z. fusiformis, by the more convex volutions, the tumid 
body whorl, the longer aperture, and the nearly straight fold. 
Size—Axis, 1 inch and 8-10ths nearly; diameter, 11-10ths of an inch. 
Locality—Headon Hill. 
No. 40. Limn#A COLUMELLARIS. J. Sowerby. Tab. XIII, fig. 9 a—Z. 
LiMNEA COLUMELLARIS, Sow. 1826. Min. Con., vol. vi, p. 53, t. 528, fig. 2. 
= = ? Lyell and Mur. 1829. Sur les depéts lacustres, &c., du Cantal. 
L. testa ovato-ventricosd, sub-turritd, quinquies vel sexies circunwvolutd ; spira brevi, 
apice acuto; apertura ovali, dilatatd, bessem totius teste in longitudinem Jere equanti; 
plica columellari rotundatd, callosd, valde contortd, pro-eminenti. 
I am indebted to Mr. Sowerby for the use of the original specimen described by 
him of this species. It is a ventricose, oval shell, with a short pointed spire, and 
formed of five or six very convex whorls, rather depressed at the suture, whence the 
shell presents a subturreted appearance; the aperture is large, effuse, and nearly as long 
as two thirds of the whole shell; the thick, callous-like fold is round, very prominent, 
and much twisted. 
If it were not for the convexity of the whorls and the size of the aperture, I should 
be inclined to consider this shell to be only a variety of LZ. fusiformis; and that the 
unusual contortion of the fold, a character to which individuals of that species occa- 
sionally approach very nearly, is accidental. But in this species, the pyramidal shape, 
which always distinguishes the spire of Z. fusiformis, is altogether wanting. From 
L. tumida, which it resembles in the size of the aperture, it is also separated by the 
