278 MR. CONRAD'S DESCRIPTIONS OF 



M. cyELATURA. PL 38, fig. 3. — Ovate-oblong, turrlted ; volutions six, with longitudinal ribs and unequal 

 promiaent revolving lines, subnodulous where they cross the ribs ; the ribs on the body whorl do not 

 reach the middle : the color ochraceous and brown ; aperture narrow, elliptical; labium with interior 

 brown bands ; superior part of columella somewhat callous. 

 Proceed. Acad. Nat. Sc, Vol. iv., p. 154. 



Inhabits Savannah River. 



M. SYMMETRICA. PI. 38, fig. 5.— Subukte ; whorls nine, slightly convex, with longitudinal slightly curved, 

 narrow ribs, interrupted near the suture by a revolving granulated line ; ribs on the body whorl not 

 extending as far as the middle; margin of labrum profoundly rounded; color ochraceous and black. 

 Proceed. Acad. Nat. Sc, Vol. iv., p. 155. 



Inhabits Savannah River. 



Near the apex, two or three volutions have a fine granulated carinated line. 



M. PERANGULATA. PI. 38, fig. 6. — Subulate ; volutions nine or ten, with an acutely carinated angle on all 

 except the body whorl, which is subcarinated ; on each whorl of the spire is a revolving granulated 

 line above the carina : color olive brown. 



Proceed. Acad. Nat. Sc, Vol. iv. p. 1 5i. 



Inhabits Savannah River. 



M. NEBULOSA. PI. 33, fig. 9. — Elongate-conoidal ; volutions six or seven, with revolving raised lines ; 

 whorls of the spire carinated below the middle, above which they are longitudinally ribbed, and have 

 two or three revolving granulated lines ; granules compressed ; aperture widely elliptical ; color 

 ochraceous, with brownish-black stains. 



Proceed. Acad. Nat. Sc, Vol. iv., p. 155. 



Inhabits Savannah River, 



M. PERCARiNATA. PL 38, fig. 10. — Elongate-conoidal ; volutions of the spire with a carinated line below 

 the middle, and a revolving granulated line above ; body whorl with a granulated revolving line near 

 the suture, and three carinated lines, the superior one largest, the lower one fine ; color dark oliye 

 brown. 



Proceed. Acad. Nat. Sc, Vol. iv., p. 155. 

 Inhabits Savannah River. 



The following new and interesting Shells are from the coasts of Lower California, 

 and Peru, and were presented to the Academy by Dr. Thomas B. Wilson. 



SOLECARDIA, Con. 



Shell bivalve, equivalve ; hinge with two diverging cardinal teeth, and a linear 

 oblique cartilage pit between ; cardinal plate profoundly grooved on each side of the 

 teeth ; muscular impressions two, small, rounded, remote from the margins, 

 particularly from the base ; pallial impression entire. 



