WAAUENOCERAS. 139 



The shell is sniooth, except tor the ti-iinsverse striae of growth and the 

 periodic constrictions on sulcations. This (renns was first described by 

 Gemmellaro" from the Permian of Sicily, and has been found elsewhere 

 only in Texas; it seems to be lacking in the Productus limestone of the 

 Salt Range of India, and in the Hnngarites beds of the Upper Permian of 

 Armenia. (_)n this account some writers have been inclined to regard 

 Waayenoceras as a southern genus. But the evidence brought forward in 

 this paper shows that it probably developed in the American region from 

 the gastrioceran stock of the Glyphioceratida>, in the genetic series Gastrio- 

 ceras, Paralet/ocrras, Schisfocerds, Slnonanlifcs, Waaqenoceras. 



The phylliform septa, the globose whorls, and the constrictions all show 

 that the genus could not have been derived from the Popanoceratida^, in 

 which the sejita are never phylliform, and the whorls usually laterally com- 

 pressed. Shumardites, described in this paper, shows an approach to Waagen- 

 oceras, in the form of the whorls, the constrictions, and the beginning- of 

 phylliform digitation of the septa, and through this genus the family history 

 can readily be traced back to Gastrioceras. 



Waagenoceeas ciMMiNsi White. 

 PI. XX 11, tigs. 4-8. 



1889. I^ychitrx cummrns/\ C. A. White, Am. Nat.. Vol. XXIII. p. 117, PI. I. 



tigs. 4-8. 

 1891. Waa(/enocerax ciniiiuin.-^i, V. A. White, Bull. l'. 8. (leol. Survey No. 77, 



p. 2(1, PI. I, tigs. -1-8. 

 19(11. PdjtiiiKictrdK {Hyatt ites) cuinirii)hsi^ F. Freeh, Die Dyas, p. 512, tigs. 8 and 4. 



Shell subglobose somewhat compressed laterally, with broadly rounded 

 venter. Umbilicus rather deej) and narrow, with small portion of the inner 

 whorls showing. Cross section of whorl helmet-shaped, with greatest 

 breadth at one-third of the height from the umbilical shoulder's. Shell 

 nearly smooth, with tine ci'oss stria^, and fine spiral lines occasionally 

 visible. Septa complex, the numerous lobes and saddles being all digitate; 

 the siphonal lobe is deeply divided !)}• a rather narrow siphonal saddle, the 

 lateral lobes are three in number, and in addition to these there are three 

 auxiliaries. 



« Fauna cale. Fiisulina, p. 9. 



