80 PALEONTOLOGY OF NEW JERSEY. 



Inoceramus perovalis. 

 Plate XV, Fig. 6. 

 Inoceramus 2)crovaI is Courart. J. A. N. S., Phil., 2d ser., Vol. II, p. 299, PI. XXVII, Fig. 7. 

 Proc. Acad. Xat. Sci., 1852, p. 200. Gabb. Syuop., p. 129. Meek, Check-list, 

 p. 10. Geol Surv. N. J., 1868, p. 720. 



Shell small, almost regularly oval, the. width and height being nearly 

 as six and seven. Valves nearly equally convex, the right side perhaps a 

 very trifle more convex than the left. Hinge-line comparatively long 

 when the oval form is considered, being a.bout three-fifths as long as the 

 greatest width of the shell and oblique to the axis of the valve. Beak of 

 the right valve sharp, projecting much beyond the line of the hinge, giving 

 a proportionally broad or high hinge area, and on the cast, which is the 

 condition of the type specimen, shows the single strong ligamental depres- 

 sion opposite the apex Surface of the .shell, as indicated on the cast, 

 marked by proportionally distinct concentric lines parallel to the margin 

 of the valves. 



In form this species is very distinct from any other described, and 

 cannot well be confounded with them; the obliquely oval form, only a 

 little deflected from an erect position, is also quite distinctive. The only 

 individual known is the type specimen figured by Mr. Conrad, as above 

 cited, and is entirely a cast with the left valve imperfect. In size, it is less 

 than one inch and three-eighths in height, measuring along the axis of the 

 valve, by a little more than one inch and one-eighth in width. The 

 remarkable height of the hinge area and the impression of a single lig- 

 amental pit is somewhat peculiar, and gives one some doubt as to its true 

 affinities with the ordinary forms of Inoceramus. 



Formation and locality. — Mr. Conrad states in his description that the 

 species is from the Chesapeake and Delaware Canal, crediting it to Mr. 

 Vanuxem. The specimen is borrowed from the collection of the Academy 

 of Natural Sciences, Philadelphia, for this work, and is labeled, apparently 

 in Mr. Conrad's own handNvriting, "New Jersey." 



Inoceramus pro-obliquus, u. sp. 

 rUite XIV, Fig. 17. 



Shell somewhat below the medium size for the genus; subovate in out- 

 line, tlie axis of the shell being directed forward of a right angle to the 



