[From the Proceedings of the Boston Society of Natural History, January 17, 1872.] 



Descriptions of New Species of Marine MoUusks from the Coast 



of Florida. 



BY ROBERT E. C. STEARNS. 



MargineUa [Glabella) opalina, Steams, /o-'*-/ 



Shell ovate, solid ; light to dark amber, some specimens showing obscure band?, 

 more or less intense, of same color ; subtransparent, smooth, polished ; spire ele- 

 vated, apex rounded ; whorls four, suture distinct ; aperture rather more than 

 half the length of the shell ; outer lip thickened, internally crenated, and strongly 

 notched above ; columella with four well developed plaits. 



Largest specimen measured long. .21, lat. .1 inch ; 



Smallest specimen measured long. .17, lat. .09 inch. 



Habitat : Rocky Point, Tampa Bay, west coast of Florida, where several 

 specimens were collected by Col. E. Jewettand myself; this beautiful little shell 

 was found by us upon the under side of bunches of oyster shells, near low water 

 mark. I know of no other species with which it might be confounded. 



MargineUa {Glabella) aureocincta, Stearns, p. 21- 



Shell small, solid, ovate-conic ; spire elevated, rounded at the apex ; whorls, 

 five, suture indistinct, being hidden by the enamel ; aperture narrow, linear, about 

 half the length of the shell ; outer lip thickened, its internal edge moderately 

 notched above and crenated below ; surface smooth, polished, white, with two 

 revolving amber-colored bands ; columella with four prominent plications. 



Measurement : long. .16, lat. .07 inch. 



Habitat : Long Key, on the west coast of Florida, where I obtained the single 

 (living) specimen described. An exceedingly beautiful shell, resembling in its 

 general features, color excepted, my G. opalina, but less robust, with a more acute 

 spire ; the internal crenations of the outer lip less prominent ; the columellar plaits 

 less conspicuous, closer and more oblique. The color of the bands will quite 

 likely be found to vary in different individuals ; in my solitary specimen the 

 bands are a light, clear amber, golden when seen through the intensified light of 

 a magnifier, suggesting the gilded striping on French porcelain. 



Drillia ostrearum, Stearns. ^ .^i. 



Shell small, elongated, slender ; spire elevated, sub-acute ; whorls, seven or 

 eight, concavely angulated above, and moderately convex below ; longitudinally 

 sculptured with (16-20) rounded ribs, inconspicuous on the angle, most prom- 

 inent upon the extreme convexity of the whorls, decreasing and becoming obso- 

 lete anteriorly ; intersections of sculpture nodulous ; suture marked with a thread- 



