109 Couthouy's New Species of Mollusca 
Hab. vicinity of Cape Ann. 
My own Collection. 
Cabinet of Bost. Soc. Nat. History. 
Description. Shell small, subulate, imperforate, 
polished; color a pale bluish-white; spire moderately 
acute ; whorls seven to nine, very slightly convex, mark- 
ed with twelve or fifteen, minute, regular, revolving striz, 
which are continued to the apex, diminishing in number 
as they approach it; sutures linear and rather deeply 
impressed ; aperture ovate; base very slightly effuse; 
outer lip sharp, smooth, without any sinus or groove at 
its junction with the body-whorl ; columella arcuated in 
its whole extent ; internal color milk white ; operculum? 
OssEenvaTIONS. I have seen but three specimens of 
this shell, which were all obtained from the stomachs of : 
fishes caught within a few miles of Cape Ann. For some 
time I was ata loss in what known genus to place it, 
until Brown's work, on the Conchology of the British 
Islands, fell into my hands, when an examination of his 
genus Pyramis decided the question. He has represented 
on pl. 50 and 51, seventy-one species, of which, though 
there are one or two somewhat resembling the shell under 
consideration, none can be mistaken for it unless it be 
perhaps his P. levis, pl. 50, figs. 51, 52. But had he 
been describing our species, he would hardly have select- 
ed a designation so inapplicable as levis for a shell covered 
with minute striations. I am not aware that any shell 
resembling this, has ever been discovered before, upon 
our own coasts. 
