CEPHALOPODA— ORTHOCHOANITES. 



95 



XL. Temnocheilus McCoy. 



Discoidal nautilicone of trapezoidal section throughout, with a 

 persistent row of spines on each ventrolateral angle. Easily dis- 

 tinguishable from the preceding genus by the vertical instead of 

 lateral compression of the whorls. Devonic-Carbonic. 



113. T. coxanus (M. and W.). (Fig. 1317.) Mississippic-Carbonic. 



b 



Fig. 1317. Temnocheilus coxanus. (After Meek and Worthen, Geol. III., V.) 



Distinguished by its rounded venter, rather faint, ventrolateral 

 angles with broad, low nodes, and by strong, revolving striae of 

 the shell. 



St. Louis of Indiana and Illinois; Carbonic ( ?) of Texas. 



114. T. forbesianus (McChesney). (Fig. 1318.) Carbonic. 



Fig. 1318. Temnocheilus forbesianus. (Ind. Survey.) 



