288 PROCEEDINGS OF THE ACADEMY OF 



DENTALTD^E. 

 DENTALIUM. 



D. Carolinens e. Regularly curved, ribs 9 to 11, narrow and laterally 

 flattened. 



Locality. North Carolina. 



Larger, less tapering, and having fewer ribs than D. attenuatum, Say. 

 Longer and tapering more than D. , Emmons, Geol. N. C, fig. 188. 



VERMETID^E. 



VERMETUS, Adams. 



Subquadrate, ribs 3, longitudinal, distant, the lowest one most prominent ; 

 longitudinal lines minute, close, rugose, becoming obsolete near the spire, 

 which is regular, each whorl having two carinated lines revolving in the middle 

 and one joiuing the suture at base ; longitudinal lines none. 



Locality. Neuse River, below Newbern, N. C. 



TROCHIDJE. 

 LEIOTROCHUS, Conrad. 



L. distans. Trochiform ; volutions 4; suture subcanaliculate near the 

 apex ; revolving lines, a few distant, distinct, impressed, the others very fine ; 

 periphery rounded ; base convex-depressed, with six distant impressed revol- 

 ving lines and very fine intermediate lines ; umbilicus narrow, profound ; sub- 

 carinated at base. 



Locality. Calvert Co., Md. ? 



CARINORBIS, Conrad. 

 Suborbicular ; spire small, depressed, or but little prominent ; shell costate, 

 ribs revolving, distant, prominent ; last whorl flattened above ; umbilicus 

 small, and the space beneath it channelled ; peritome continuous. 



C. (Delphinula) lyra, Conrad. C. (Delph.) qaadricostata, Emmons. (Mio- 

 cene.) 



SCR OBICULARIDJE. 



ABRA, Leach. 



A. oval is. Oval, convex, inequilateral, with five close laminar concentric 

 lines ; posterior side short, with a distinct obtuse fold ; end margins rounded ; 

 within highly polished ; cardinal and lateral teeth prominent. 



Locality. Yorktown, Virginia. (Miocene.) 



ASTARTIDJE. 



ASTARTE, Sowerby. 



Astarte distans. Triangular, convex-depressed, with four broad con- 

 centric undulations ; concentric lines unequal ; umbo flattened with small 

 prominent concentric ribs, inner margin minutely crenulated. 

 Locality. Cumberland Co., N. J., near Shiloh. (Miocene.) 

 Very distinct from the nearest allied species, A. undalata Say. 



PARASTARTE, C. 



Elevated, triangular, equilateral, ventricose ; epidermis pale and shining ; 

 hinge of right valve with one thick nearly direct tooth, and deep and rather 

 long channel in the hinge plate anterior to the tooth ; left valve with two 

 equally diverging teeth ; posterior submargin of both valves channelled 

 above. 



Estarte t r i q n e t r a, C, Tampa Bay, is the type of this new genus. 



[June, 



