CEPHALOPODA— AMMONOIDEA. 



169 



for the genus, sometimes increased by intercalation ; umbilicus 

 moderate. 



Kimeridgean of Santa Rosa and Vereda del Quernado, Mexico. 



CXXIV. EuRYNOTiCERAS Canavari. 



Like Haploceras but with coarse folds mostly on venter and 

 becoming less marked or obsolete on the sides ; suture with strongly 

 incised saddles, similar to, but more deeply incised than in the 

 Jurassic Haploceras. Jurassic. 



282. E. zitteli Burckhardt. (Fig. 1416, &). Jurassic. 



Ribs rounded, bifurcating a short distance below the venter, 

 strongly bent forward on the middle of the side and continuing, 

 though faint, to the small umbilicus. 



Portlandian of Mazapil district, Mexico. 



CXXV. PuzoziA Bayle. 



Varying from slightly involute to forms with small umbilicus ; 

 section rounded or elongate, with rounded venter; surface orna- 

 mentation varying from fine lines to ribs, which have a sigmoid 



Fig, 141 7. Puzozia breweri,y^y->^. (After Gabb.) 



