74 AMERICAN JOURNAL 



and two rather long lateral very distinct pits, the posterior one 

 very distant from the apex. The pallial sinus is rounded and 

 extends to a direct line between the apex and ventral margin, 

 according to d'Orbigny's fig. 5, and beyond that point in fig. 

 17. The present species approaches fig. 5 most nearly in out- 

 line, but the radiating lines over the whole disk is a distinguish- 

 ing character, and the height of the shell is proportionally less. 



PI. 3, fig. 11, represents the hinge of the right valve. From 

 Haddonfield, N. J. 



JENONA, Conrad. 



Equivalved, without fold ; hinge character ; two compressed, 

 very small, widely diverging teeth in the right valve ; lunule 

 very narrow, lanceolate and marked by a deeply impressed line. 



2E. EUFALENSis, [TelUna.) Journ. Acad. Nat. Sci., vol. iv, 2d 

 series, p. 277, pi. 46, fig. 15. 



M. PAPYRIA, Conrad. 



Description. — Subelliptical, inequilateral, extremely thin in 

 substance, convex, anterior side narrowed ; posterior end ob- 

 liquely truncated ; ventral margin regularly curved ; surface 

 marked by microscopic concentric close lines. Length | inch. 



Locality. — Haddonfield. 



YOLDIA. 



Y. EUFALENSIS, {Nuciila,) Gabb, Journ. Acad. Nat. Sci., 2d 

 series, pi. 69, fig. 35. 



VELEDA, Conrad. 



Equivalved. Hinge character ; left valve with a v-shaped car- 

 dinal tooth under the apex, and three compressed teeth, posterior 

 one elongated and parallel with the dorsal margin, cardinal 

 plate channeled, deeply so anteriorly. 



V. LiNTEA, Conrad. Journ. Acad. Nat. Sci., vol. iv, pi. 46, fig. 

 17. 



This small bivalve externally very closely resembles the genus 

 Protocardia^ except in being concentrically striated posterior to 

 the umbonal slope. I referred it to that genus before I saw the 

 hinge. 



VENILIA, Morton. 



V. ELEVATA, Conrad. PI. 1, fig. 7, 7a. 



Triangular, elevated, profoundly ventricose, with three ele- 



