CEPHALOPODA— ORTHOCHOANITES. 



97 



tened spines, and in the absence of the bounding ridges of the 

 median concave area of the venter. 



Coal Measures of IlHnois, Indiana, Missouri; Permic of Texas 



Fig. 1320. a, b, Temnocheilus zuinsiowi, X /^ 5 <^> '^j Endolobus missouriensis, 

 X /^ ; <?> E. speciabilisy X ^- (^-^> I^^cl. Survey ; <?, after Whitfield.) 



XLI. Endolobus Meek and Worthen. 



Differs from Temnocheilus in its strongly arched venter, and 

 in having the row of tubercles nearer the umbilical margin. Mis- 

 sissippic-Carbonic. 



117. E.spectabilis Meek and Worthen. (Fig. 1320, ^.) Mississippic. 

 Lateral nodes somewhat elongate, distant, almost one to every 



camera. (Type of genus.) 



Chester of Illinois and Missouri ; Maxville limestone of Ohio. 



118. E. ortoni (Whitfield). (Fig. 1321,0.) Carbonic. 

 Nodes more rounded, blunt and more closely crowded than in 



preceding, becoming obsolete towards the aperture. 

 Coal Measures of Ohio. 



