GASTROPODA— SCALARIIDJE—SOLARIIDJE. 7 1 1 



Varices about 9 (7 to 1 1) to a whorl, sharp and slightly oblique ; 

 interspaces smooth. 



St. Mary's and Choptank formations of Maryland. 

 354. S. (Sthenorhytes) pachypleura Conrad. (Fig. 1024, &) 



Miocenic. 



Short and thick, with large body whorl. Varices thick, sub- 



FlG. 1023. Scalaria sillmani. 

 (After Whitfield.) 



Fig. 1024. a, Scalaria sayana ; b, S* 

 (Sthenorhytes) pachypleura. (Md. Surv. } 



spinose above ; body whorl with a cingulum or discontinuous 

 spiral in the interspaces ; mouth nearly circular, lips expanded. 

 St. Mary's, Choptank, and Calvert formations of Maryland, etc. 



Family Solariid^e Chenu. 

 CVI. Solarium Lam. 

 Depressed-conical to flat and deeply umbilicated shells with 

 strong peripheral angulation in the most specialized species ; nuclear 

 whorls heterostrophic ; surface smooth or with spirals, etc. ; aper- 

 ture quadrilateral ; umbilicus with notched margins or spiral ; 

 operculum horny. Jurassic-Recent. 

 355. S. ? planorbis Roem. (Fig. 1025.) Comanchia 



Fig. 1025. Solarium planorbis. (After Roemer. ) 



Depressed, spire flat or sunken ; whorls dorsoventrally com- 

 pressed, slightly embracing ; surface smooth except for a line of 

 notches along the umbilical edge. 



Edwards limestone of Texas, etc. 



