* 
322 Marine Shells of Massachusetts. 
JAMINIA PRODUCTA. 
Plate III. Fig. 8. 
J. testå parvà, albidå, cylindraced ; epidermide fuscá, nitidá, eroså ; 
anfractibus octo ; suturà impress ; spirà productà, truncatá ; apertura 
sub-ovatå, suprà contractà, infra latè rotundatà ; columella uniplicatà, 
Shell small, moderately thick, ashy white beneath 
the epidermis, conico-cylindric, with fine irregular 
strie of growth; epidermis brown, smooth, closely 
adhering, eroded chiefly in the incremental strie; 
whorls eight or eight and a-half, ‘slightly convex; 
suture very distinct, impressed ; spire about three- 
fourths of the length of the shell, or slightly more, 
truncated at tip; last whorl about one-third of the 
bulk of the spire ; on two or three of the last whorls 
may sometimes be seen an indistinct impressed re- 
volving line, just below the suture, and also more 
rarely on the middle and lower part of the whorls ; 
aperture with its plane at an angle of about 16° with 
the length of the shell, sub-ovate, contracted above, 
broadly rounded below ; labrum rather thin, regular- 
ly arched, but more so in the lower half; columella 
with a single, rather obtuse plait; labium with a 
slight lamina, which is often obsolete ; no wmbili- 
cus ; operculum very small, thin, horny, nearly trans- 
parent, sub-triangular, apex on one side. 
Length, .25 inch ; greatest breadth, .07 inch. Of 
the operculum ; length, .033 inch ; breadth, .025 inch. 
Cabinets of Bost. Soc. Nat. Hist. ; of Middlebury 
College; of Dr. A. A. Gould, of Boston; of Prof: 
Hitchcock, of Amherst ; and my own. 
Habitat. A cove on the east side of Fairhaven- 
