I'Jw Fauna of llic Maxz'illc Limestone. 



411 



189o. Naittiliis {Teiiinotheilus) s[ieciabilis. Whittield, Geol. Surv. Ohio, 

 Vol. VII, p. 480, pi. 10, fig. 2-2. 

 Maxville limestone : Near Rushville, Ohio. 



Description. — -"Shell of medium to large size, composed 

 of several volutions, which increase rapidly in size, and are 

 (transversely) elliptical in a transverse section; the diameter 

 from side to side being about one-third greater than the dorso- 

 ventral diameter at the same point ; the lateral edges being 

 obtusely angular, and the dorsal [ventral] portion of the sec- 





Fig. 33. — Endolohus spcctabilis. Lateral view. (After Whitfield.) 



tion larger and more convex than the inner part, strongly con- 

 vex and subangular on the back. Inner surface of the volution 

 strongly impressed by the one preceding, which it embraces to 

 near the point of greatest diameter. Umbilicus very broad and 

 deep, exposing each of the inner volutions to just beyond the 

 point of greatest transverse diameter, the umbilical surface of 

 the volutions being moderately convex but quite abrupt. The 



