CEPHALOPODA— CYRTOCHOANITES. 



113 



Of moderate size; non-umbilicate ; strongly compressed laterally, 

 with very deep, narrow, lateral lobes. 

 Shark River Eocenic of New Jersey. 



Suborder Cyrtohoanites Hyatt. 

 LVI. LoxocERAS McCoy. 

 Smooth orthoceracones of circular or elliptical section ; siphuncle 

 highly nummuloidal in later stages, centren or near center; septa 

 single, camerse mostly empty. Ordovicic-Carbonic. 

 146. L. moniliforme (Hall). (Fig. 1346.) Ordovicic. 



Of circular section and moderate rate of enlargement; septa 



Fig. 1346. Loxoceras 77ioniliforme . (After 

 Ruedemann, Bull. 90, N. Y. State Mus. ) 



Fig. 1347. Loxoceras luxum, 

 X%' (After Hall.) 



shallow; siphuncle large, propiocentren, strongly nummuloidal 

 and empty; surface with growth lines only. 



Chazy of Lake Champlain region. 

 147. L. luxum (Hall). (Fig. 1347.) Devonic. 



More rapidly tapering than preceding, with deeper septa ; siphun- 

 cle central; organic deposits occur on septa around siphuncle and 

 on ventral walls. 



Schoharie of New York. 



LVn. N^DYCERAS Hyatt. 

 Gyroceracones and trochoceracones with whorls of subtriangular 

 section, nummuloidal siphuncle near the venter, sutures with pro- 



