174 



NORTH AMERICAN INDEX FOSSILS. 



abruptly inflected ; ribs distant, narrow, obsolete towards umbilicus. 

 Nanaimo of Vancouver. 



I 



Fig. 1423. Fachydiscus otacodcnsis, X Yz' 

 (After Whiteaves, Mes. Foss., I.) 



Fig. 1424. Fachydiscus ota- 

 codensis, section, X ^' (After 

 Whiteaves. ) 



292. P. suciaensis (Meek). (Figs. 1425, 1426.) Cretacic. 

 Similar to the preceding, but with broader and lower whorls, 



which are more deeply impressed and less abruptly inflected at the 

 umbilicus ; ribs sharp, alternating in length. 



Nanaimo of Vancouver and northwestern United States. 



293. P. newberryanus Meek. Cretacic. 

 Large, more compressed than P. suciaensis; rather coarsely 



ribbed with an occasional large rib ; in the young a row of umbilical 

 nodes occur from which the ribs often bifurcate; lobes and saddles 

 much less divided than in P. suciaensis ; siphonal lobe with three 

 principal branches on each side, instead of four as in that species, 

 these being again divided at their summits into two or three 

 branches. 



Nanaimo of Vancouver; Chico of California. 



294. P. complexus Hall and Meek. Cretacic. 

 Rather small, subglobose, with broadly rounded venter and large 



