32 



Cincinnati Society of Natural History. 



and alation posterior to it are not the characters possessed by 

 any of the described species in that genus. 



At the present, we think we are not justified in proposing a 

 new generic name for it, and prefer to wait until something 

 is known of the cardinal teeth and hinge line. 



Lepidocoleus JAMESI Faber. 



One of the authors, Mr. Faber, desires to correct the defini- 

 tion of Lepidocolens and of Lepidocol&us Jamesi, as it appears 

 in Vol. IX. p. 15, of this Journal, by saying that a transverse 

 section, instead of being triangular, is somewhat heart-shaped, 

 and the two series of plates are alike. On the dorsal side 

 each row, or series of plates, is rounded at the overlapping 

 apices of the plates, and between the rounded ridges thus 

 formed there is a well-defined furrow or depression. 



Cyrtocerina madisonensis S. A. Miller. 



At the time one of the authors described, for the Eighteenth 

 Indiana Report (Adv. sheets Eighteenth Rep. Geo. Sur. Ind., 

 p. 64), a fossil under the name of Tryblidium madisonense, the 

 internal part of it was not disclosed by the specimens at 

 hand, while the external shell was remarkably well-preserved 

 and looked like that of a Gastropod, and the form was that of 

 a rather high Tryblidium. There was nothing in the shape 

 or external appearance that would create the slightest sus- 

 picion that it belonged to the Cephalopoda. After that time 

 specimens were collected showing a short, very rapidly taper- 

 ing siphuncle, terminating on the concave side, below the 

 apex and occupying the same position as the siphuncle in 

 Cyrtocerina. Prof. Geo. C. Hubbard was the first to find that 

 it was a chambered shell and possessed a siphuncle, and an 

 examination of his specimens by the author led him to the 

 conclusion that it is a true Cyrtocerina. The chambers are 

 short, though longer than the) 7 are in Cyrtocerina typica, and 

 the shell expands somewhat more rapidly than it does in 

 that species. 



