Newell.] 



484 



[Jan. 18, 



the peculiarly curved compartments placed nearly parallel to the 

 long axis of the shell. 



It includes two groups : one with annulated shells, the other 

 with smooth banded or striated shells. 1 



Ascocekas Newberryi Billings. 

 Ascoceras Newberryi Billings, Pal. Foss., i, p. 163. 



To this species is referred a small poorly preserved specimen 

 without shell and with one faint marking indicating a suture. The 

 upper part is broken so that the aperture is not shown. In gen- 

 eral outline this short and ventricose cast resembles the figure and 

 description given by Billings of the type from the Middle Silurian 

 of Anticosti. 



Locality. — Delphi, Ind. 



Ascoceras Indianensis n. sp. 



\J 



Dorsal. 



Lateral. 



Ventral. 



Shell very small, nearly straight, slender, transverse section 

 broadly oval ; greatest diameter one-third the distance from the 

 apex to the most remote portion of last septum. 



The side on which is the living chamber — the ventral side — is 

 convex and the dorsal side is slightly concave giving the shell the 

 appearance of being slightly curved toward the dorsal side. 



In the horizontal section, through the middle of the fossil, the 

 dorsi-ventral diameter is 94- mm. ; lateral diameter at the same 



iProc. B. S. N. H., XXII, 1883, p. 279. 



