.. at the upper side of the w 
* 
PS Sabie - Shell coni 
282 New Species of Massachusetts Shells. 
_trifidus, Totten, (Am. Journ. Sc. XX VI, 368,) but this 
generic name is appropriated to a genus of naked 
Mollusca. 
In size and form this shell resembles the A. trifidus, — 
- but differs from. it in the convex whorls, granulous. sur | ? 
face, and revolving lines which are all very distinct and 
less numerous, while in the A. trifidus two or three only 
are distinct, and the others are nearly obsolete, —in the 
aperture, which is not angular superiorly, and is more 
effuse and less rounded inferiorly. It is more nearly 
allied to Turbo spiralis, Montague, Test. Brit. p. 323, 
but differs in the number of volutions and in the presence 
-of the revolving lines around the rugose surface. In the 
figure the Turbo spiralis i is broader in the middle of its 
length, but this species is broader below the middle ; the 
aperture is also shorter. 
I take pleasure in — the sjicifi name suggested 
by Dr. Gould. 
. P. testa parvulà, cook , decigh; epidermide fuscá, nitidà ; anfrac- 
tibus sex, convexis; suturà impress, die uiis Sgt Me 
suprà a, infra rotundata ; ; labro tenui j 
flexa, ha ud plicatà 
> rather elóngate, at: 
perforate ; spire truncated; @pidermis brown, shining, 
not membranous, not separable from the shell ; sors 
about six, not reckoning those which are lost at the 
apex, with minute stris of growth; suture strongly im- 
pressed, often double ; son es with a revolving line 
aperture about two-fifths 
