192 NORTH A Ad ERIC AN INDEX FOSSILS. 



branches, the latter separated by median, ventral channel; suture 

 complex; lateral saddles narrow and deeply cut, the first often 

 trifid; dorsal series with two pairs of complex zygous lobes and 

 saddles, separated by complex, narrow, antisiphonal lobe. Juras- 

 sic-Cretacic. 



331. H. vancouverensis (Meek). Cretacic. 



Section of whorls triangular; umbilical angles abrupt; ventral 



nodes narrow, elongate, close; median depression moderate; 



Fig. 1450. Olcostephanus traski, FiG. 1451- Stoliczkaia remondii^ 



suture. (After Gabb.) suture. (After Gabb.) 



ribs faint, narrow, alternating, the longer tubercled near umbilicus. 

 Nanaimo group of Vancouver. 



CXLVII. Stoliczkaia Neumayr. 



Like Hoplites, but the ribs enlarging outwards, and passing con- 

 tinuously across the rounded venter. Comanchic. 



332. S. texana (Cragin). Comanchic. 

 Ribs simple or subnodose at ventral margin, less strongly widen- 

 ing than in preceding, and with broader interspaces; suture very 

 simple. 



Washita of Texas. 



333. S. dispar (d'Orbigny). Comanchic. 

 Small tubercles on margin of venter; ribs unequally longer and 



shorter, nodular on venter of body whorl and dividing on sides; 

 body chamber irregularly evolute. 

 Horsetown of California ; Comanchic of Texas ; Gault of India, etc. 



334. S. remondii (Gabb). (Fig. 1451.) Comanchic. 

 The ribs become coarse towards the venter which they cross con- 



