CEPHALOPODA— AMMONOIDEA. 147 



XCI. Waagenoceras Gemmellaro. 



Compact, smooth, round whorled, with moderately narrow um- 

 biHcus and complex, ammonitic sutures, of numerous, phylloid 

 lobes and saddles, all digitate. A true Palaeozoic ammonite. 



Permic of Texas and Sicily. 



228. W. cumminsi White. (Fig. 1^00, d,e.) Permic. 

 Subglobose, somewhat compressed laterally; deep and narrow 



umbilicus showing only small part of inner whorls; cross section 

 helmet-shaped; surface with lines of growth and occasional fine 

 spirals ; siphonal saddle narrow ; three lateral and three auxiliary 

 lobes besides the divided ventral one, all complicated as shown in 

 figure. 



Wichita of Texas. 



229. W. hilli Smith. (Fig. 1400,/.) Permic. 

 More compressed laterally than preceding, with narrower um- 

 bilicus and higher whorls, which are, however, less deeply embrac- 

 ing; five sinuous constrictions on last whorl, which bend sharply 

 backward on abdomen; septa more complex than in preceding, as 

 shown in figure. 



Double mountain beds of Texas. 



Prolecanitida. 



XCII. Prodromites Smith and Weller. 



Laterally compressed, discoidal and involute, with deeply embrac- 

 ing whorls, narrow umbilicus, high, hollow abdominal keel and 

 complex ceratitic sutures, with numerous rounded saddles and 

 notched lobes; ventral lobe long and undivided. Mississippic. 



230. P. gorbyi (Miller). (Fig. 1398, a, 6.) Mississippic. 

 Narrowly compressed, with very narrow umbilicus and narrow 



abdomen, which, when the high, hollow keel is broken away, is 

 flat, with angular sides. 



Kinderhook (Chouteau limestone) of Missouri; Oolitic lime- 

 stone of Burlington Iowa, and Rockford Goniatite bed of Indiana. 



XCIII. Prolecanites Mojsisovics. 



Evolute, compressed goniatites, with wide umbilicus, slightly 

 embracing whorls, and lanceolate septa ; external lobe undivided, the 



