100 



NORTH AMERICAN INDEX FOSSILS. 



noded; venter broadly convex; sides flat; sutures with strong, 

 lateral lobe. 



Upper Coal Measures of Kansas City, Missouri. 



XLIIL Tainoceras Hyatt. 

 Like Metacoccras, but with a double row of nodes on the side 



I 



F(G. 1324. Tainoceras cavatum, X Yz' (After Hyatt, Texas Survey, 11.) 



and a row of similar or fainter nodes on each side of the ventral, 

 flat or concave space in the adult. Siphuncle above center ; sutures 



Fig. 1325. Tainoceras occidentale, young, adult and section, X %' (After Hyatt. 

 Texas Survey.) 



