October, 1843.] 311 



Locality. Wilmington, N. C; Neuse river below Newborn, N. C. 



Resembles somewhat V. punctulata, Val. (Enc. Method, t. 267, p. 4.) of 

 Florida, but has much more prominent, narrow and more remote ribs. In this 

 respect it differs also from V. cortinaria, Rodgers. 



Plicatuia. 



P. densata. Ovate, thick, profoundly and irregularly plicated ; inferior valve 

 ventricose, its ribs acute, with arched spiniform scales ; cardinal teeth large, 

 curved, laterally striated, crenulated on the margins; larger cardinal tooth in each 

 valve slightly bifid, broad ; muscular impressions prominent. Length one inch 

 and an eighth. 



Locality. Cumberland co., New Jersey. 



The valves have about 10 folds, and the lower valve closely resembles a varie- 

 ty of Ostrea virginiana. 



CllEPIDULA. 



C. densata. Oblong, thick and ponderous, profoundly ventricose, with coarse 

 lines of growth; umbo very prominent, somewhat compressed; diaphragm 

 slightly depressed on each side, the margin much contracted, near the middle 

 angulated ; from the angle to the anterior side rectilinear. Length one inch 

 and a quarter. 



Locality. Natural well, Duplin co., N. C. 



Differs from C. costata, Morton, in the profound angular emargination of 

 the diaphragm, in being proportionally narrower, and without ribs or stris. 



STATED MEETING, October 11, 1S43. 

 Vice President Morton in the Chair. 



DONATIONS TO LIBRARY. 



Annales des Mines. Quatrieme Serie. Tome 2d, 5"} e Liv. 

 de 1842. In Exchange. 



Transactions of the Linnean Society of London. Vol. 19, 

 Part 2d ; List of Members for 1843 ; and a portion of the 

 Proceedings of the Society. From the Society. 



A Treatise on some of the Insects of New England, which 

 are injurious to vegetation. By Thaddeus William Harris, 

 M. D. 8vo. Cambridge, 1842. From a friend of Science. 



