96 



NORTH AMERICAN INDEX FOSSILS. 



Whorls broader than in preceding and with flatter venter, and 

 stouter, more distant nodes ; also septa more distant. 



Coal Measures of Ohio, Indiana, Illinois, Missouri and Texas. 



115. T. latus (Meek and Worthen). (Fig. 1319.) 



Carbonic. 



Fig. 1319. 



Teninocheilus latus, two views of a fragment, X , 

 Worthen, 111. Geol., V.) 



(After Meek and 



Broad and strongly depressed whorls, with strong, rounded and 

 compressed ventrolateral spines, and two ridges dividing the venter 

 into thirds, and bounding a flat or slightly concave median area 

 marked by strongly reflected growth lines. 



Coal Measures of Ilhnois, Kansas, etc. 



116. T. winslowi (Meek and Worthen). (Fig. 1320, a, b.) 



Carbonic-Permic. 

 Differs from the preceding in its stronger, generally less flat- 



