CEPHALOPODA— AMMONOIDEA. 



215 



d 

 Fig. 1489. 



Metengonoceras dumblii, two views and section, 

 larged. (After Hyatt.) 



376. S. pleurisepta (Conrad). (Fig. 1490.) Cretacic. 



Last portion of adult whorl rounded; sides with two rows of 



tubercles, the outer becoming obsolete in old age ; first five saddles 



divided, the depth of the division decreasing; lobes broad, rounded, 



p t H'l *«" ! '" " »*H 



Fig. 1490. Sphenodiscus pleurisepta, side and end view and sectional view, X ^> 

 and suture enlarged. (After Hyatt. ) 



with six or more notches or marginals in the first three laterals 

 which increase in size ; remainder smaller, with smaller notches. 

 Eagle Ford beds of Texas and Mississippi. 



