some New Species of Marine Shells. 287 
Lrrromma Lunara. Pl. XXIV. Fig. 3. Proceed. Bost. 
Soc. Nat. Hist., l c. 
A . 
nea; spirå elevatå, conicá, acutå ; suturis inconspicuis ; q ’ 
planis, costis transversis magnis, crebris; anfractu ultimo angulato, usque 
ad basim costato; aperturà obliqué ellipticà ; labio acuto, undulato; colu- 
mellà inferné latissimá, planà. . 
L. testå quadrangulari, imperforatà, crasså, costatà, lutescente vel brun- 
Es ui cans è; 
Shell quadrangular, imperforate, thick, costate, yellowish or 
brown ; spire elevated, conical, acute; sutures small, incon- 
spicuoùs; whorls four, flat, with numerous large, transverse 
cost: ; last whorl angled, costate to the base; mouth oblique- 
ly elliptical; outer lip sharp, undulating; columella below 
very broad and flat. Long..07. Lat. .05 poll. 
Hab. Coast of New Jersey, near Cape May. 
Remarks. The general outline of the shell is remarkably 
quadrilateral, almost rhomboidal. The whorls are flat, and 
covered with numerous revolving coste, which are much 
smaller on the base of the last whorl. The outer lip is very 
sharp, and with à waved edge caused by the exterior costs. 
For a short distance inside, there are sulci, corresponding to 
the ribs. "The thickening of the columella commences about 
half Way from the top of the mouth, and continues round the 
base towards the. outer lip, forming a broad, erescent-shaped 
area, which is very remarkable. The substance of the shell 
75 exceedingly thick. The color is mostly brown, turning to 
yellowish where the thinning of the outer lip commences. 
: I met with a number of these pretty little shells among the 
interstices of a stone overrun with Serpule, found at Cape 
May. I was at first tempted to suppose it the young of some 
-Other species; but it has all the characteristics of a mature 
shell, in the thickness of the substance, number of whorls, 
broad columella, &c. I know of no species with which it 
could be confounded. : : : 
