LAMELLIBEAKCHIATA OF THE LOWER MARLS. 169 



in the want of the flattening of the shell on the shorter end, and in the 

 greater thickness and firmer substance of the shell The shell occurs in the 

 collection of the Academy of Natural Sciences, Philadelphia, labeled, in 

 Conrad's writing, Temesa Eufalensis^ but corresponds to the figure of Tellina 

 Eufalensis given in the Journal of the Academy of Natural Sciences, as 

 above cited, except that it is a right instead of a left valve, and is shghtly 

 imperfect at the anterior end. The shell cannot be mistaken for a species 

 of Tenera, and I find no reference to the genus Temesa. There can be no 

 question, however, in regard to the identity of this specimen with that 

 described as ^nona JSufaulensis, 



Formation and locality, — In the micaceous clays below the Lower Green 

 Marls at Haddonfield, New Jersey. Mr. Conrad's type of the species Tellina 

 Eufaulensis (afterward changed to JEnona Eufaulensis) was from Eufaula, 

 Alabama. There are casts of small sheik of a character similar in form to 

 this among collections from Mr. Schanck's pits near Marlborough, but it is 

 difficult to identify positively such imperfect material. 



JBnona papyria. 

 Plate XXIII, Fig. 4. 

 ^nona papyria Conrad. Am. Jour. Conch., Vol. VI, p. 74. 



Mr. Conrad's description of this species is as follows: ^^Subelhptical, 

 inequilateral, extremely thin in substance, convex, anterior side narrowed ; 

 posterior end obliquely truncated ; ventral margin regularly curved ; surface 

 marked by microscopic concentric lines. Length, | inch." 



A single right valve, marked with the name Tellimera papyria Conrad, 

 exists in the collection of the Academy of Natural Sciences, Philadelphia, 

 which agrees closely with the above description. As I can find no descrip- 

 tion or reference to such a species under that generic name, I am led to 

 suppose this shell was at first considered as a Tellimera^ but subsequently 

 placed and described under JEnona without changing the label. The spec- 

 imen has now lost all the beak and cardinal parts, and I can only give a 

 restored figure of the outside of the valve. It is very much elongated 

 transversely, and of an elliptical form, as well as extremely thin in substance. 



