92 Couthouy’s New Species of Mollusca 
JAMINIA EXIGUA. 
Plate II. fig. 7. 
arvulà, conia, albido-pellucida ; anfractibus convexis; 
suturis impressis; aperturá ovali; basi effusi; columella reflexá, uni- 
plicatà; epidermide Mii mci 
Long. seven fortieths, diam. of basis three fortieths, 
of an inch. 
Habitat Boston Harbor. 
My own Collection and that of the Society. 
Description. Shell conical, rather elongated, im- 
perforate; apex a little obtuse, diaphanous; color a 
bluish white, under a brownish membranous epidermis ; 
volutions five to $ix, convex, the inferior one somewhat 
ventricose, and constituting about half the entire length 
of the shell; sutures strongly impressed, a single, faint, 
revolving line, is sometimes visible just below them ; in- 
cremental strie microscopic, numerous, and regular, im- 
perceptible until the epidermis is removed; aperture 
regularly oval; base somewhat effuse; outer lip sharp, 
smooth, without sinus at the juncture, and rendered 
slightly angular superiorly, by a depression of the upper 
portion of the body-whorl; columella white, shining, . 
reflected in such a manner as occasionally to give the 
shell the aspect of being sub-perforate, furnished with 
a single, prominent oblique tooth or fold near its middle ; 
operculum corneous. 
Oxsservations. Found at Chelsea, near the ferry 
landing, adhering to the decaying wood and fucus. It 
has considerable resemblance to Acteon trifidus, ToT- 
TEN, which evidently belongs to the same genus. In- 
deed one of the species figured by Brown, (J. pullus, 
