673 



Plat. 



Platyceras multispinosum, Meek. Proc. Acad. Nat. Sci. 



villa. 



Ted, Ohio X. XK- 

 Philada, 1871. Corniferous limestone.— Fal, Ohio, Vol. 1, 

 1873, page 210, plate 20, fig. 7 a, internal cast, showing irregu- 

 larities corresponding to the spines of the exterior, some re- 

 mains of the bases of which are seen in a part of the matrix 

 remaining attached to the left side of the specimen. (This fig- 

 ure is defective, in having the nodes marking the position of 

 spines too much like pits ^ and very much too scattering.) 7 J, 

 profile of another specimen, also a cast of the interior, with a 

 little of the shell near the apex remaining. It is not turned so 

 as to show the greatest length of the shell, which grew larger 

 than F, dumosum, Conrad, more ohlique, more expanding, 

 and more numerously spined, 200 to 100 on the largest speci- 

 mens. Nearer P. echijiatum^ Hall, a Hamilton species. 

 Spines needle like, tubular (as in Productus)^ but not com- 

 municating with inside of shell, except near lip. VIII a. 



Platyceras naticoides, Eth., 1878. VI 



Platyceras newberryi, Hall, 1859. VI 



