142 PALEONTOLOGY OF NEW JERSEY. 



difference being very marked. But among them all I find no individual 

 answering in character to that figured by Dr. Romer as above cited, and 

 think it very doubtful if the species really occurs in the New Jersey beds. 



Leiopistha inflata, n. sp. 

 Plate XX, Figs. 4 and 5. 



Shell rather smaller than those of L. protexta Conrad, and very ventri- 

 cose, with exceedingly large and inflated beaks, which are nearly central, 

 very strongly incurved, and in close contact. Length of the shell only 

 about one-fourth or one-fifth longer than high, and the thickness through 

 the valves nearly or quite equaling the height. Anterior end but little 

 shorter than the posterior, and more narrowly rounded. Surface of the 

 casts marked by numerous low, nearly flattened, indistinct radii, which in- 

 crease in fineness anteriorly, and are obsolete on the posterior cardinal 

 slope. 



This species is quite readily distinguished from L, protexta by its shorter 

 and more ventricose form, more strongly inflated beaks, which are larger 

 and much more prominent. The less strongly marked ribs is also a marked 

 feature. It is not sufficiently near any of the other described species to be 

 readily mistaken. It is most nearly allied in form to X. {Papyridea) hella 

 Conrad (J. A. N. S., Phil., 2d ser.. Vol. Ill, p. 326), but that one is described 

 as having prominent angular ribs, which are tuberculated on some parts of 

 the shell which these were not. 



Formation and locality, — In the light-colored calcareous marls of the 

 Lower Green Marls at Holmdel, New Jersey. 



Genus CYMELLA Meek. 



Cymella Meeki. 



Plate XX, Figs. 6 and 7. 



Cymella Meeki Whitf. Palseont. Black Hills, p. 418, PI. XI, Figs. 27 and 28. Ext. p. 



Shell of moderate size, transversely oval or ovate, about once and a half 

 as long as high. Valves strongly convex, with large, somewhat prominent 

 beaks, situated much nearer the anterior end. Shell nearly erect, and a 



