YIH^ 



Perry Co. See Cat. 000, specimen 11-7 (two.)— F/- F//. 



Platyceras squalodens, Whitfield, Ann. N. Y. Acad. Sci., 

 Vol. 2, 1882. VppeT Helderherg, Villa. 



Platyceras striatum, new species., Simpson, Trans. Amer. 



Phil. Soc. Philadelphia, 

 1889, page 457, fig. 27, 1, 

 dorsal view, fig. 21, front 

 view. Based on Randall's 

 specimen 950-4 C of his 

 collections near Warren, 

 Pa. — Shell subconical ; 

 apex not incurved or bent 



• 



body essentially straight' 

 sides a little curved from the base to the apex ; right and left 

 sides equally developed; width at the base, length of anterior 

 and posterior sides equal. Or the anterior side is a narrow, 

 angular, conspicuous carina extending from the apex to the 

 base ; on the posterior side are three oblique, broad, promi- 

 nent, rounded ridges, with depressions between them, which are 

 wider than the ridges. Aperture oval. The bases of all the 

 specimens observed are attached to the rock so that the form 

 of the peristome cannot be definitely ascertained. Surface 

 marked by comparatively strong, radiating striae, which are 



y 





A.P.S. Tr. 1889. 



