336 



GEOLOGICAL SURVEY OF TEXAS. 



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v, \ 



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Fig. 34. 



Metacoceras dubium, n. s. 

 Loc. Kansas. 

 Coll. R. Hay. 

 Figs. 34, 35, natural size. 



There are no lines of abdomi- 

 nal tubercles, only low, broad, 

 longitudinal swellings on either 

 side of the depressed central zone 

 of the abdomen, and the nodes 

 on the sides are large and promi- 

 nent, as in other species of this 

 genus. The sides, however, are 

 narrow and slightly concave, and 

 internally a ridge is formed on 



Fig. 35. 



account of the suddenness with which they incline to the umbilicus at 

 the dorsal shoulders, and inside of this there are two broad, smooth, only 



