GASTROPODA— NA TICIDJE. 



717 



braced somewhat sunken whorls and large body whorl, with long 

 aperture narrowing upwards. 

 Malone formation, Texas. 



373. N. (Lunatia) pedernalis Roemer. 

 (Fig. 1037.) Comanchic. 

 Very large, whorls embracing to a 



little above the middle, last one ven- 

 tricose, somewhat separated. 



Glen Rose, Comanche Peak of 

 Texas, etc. 



374. N. (Lunatia) halli Gabb. (Fig. 

 1038.) Cretacic. 

 Spire elevated, height about one 



and one half times the diameter; 

 suture of internal molds deep; urn- FiQ ^ Lunatia{Tylostoma) 

 bilicus large; aperture acute above, pedernalis, x l A ? (After Hill.) 

 acutely rounded below. 



Ripleyan formation of New Jersey, Alabama, Mississippi. 



Lunatia halli. (After Whitfield.) 



Cretacic. 



375. N. (Lunatia) avellana Gabb. (Fig. 1039.) 

 Subglobose, embracing to above the ambitus, with 



impressed suture, moderate spire, large, minutely 

 umbilicated body whorl ; inner lip slightly callous, 

 aperture acute above. 



Horsetown of California, etc. 



376. N. (Lunatia) shumardiana Gabb. (Fig. 1040.) 



Cretacic-Eocenic. Fig. 1039. 



Body whorl more convex than in preceding ; base Lunatia avel - 

 y , . ,. 1 lana - ( After 



more extended at aperture ; inner lip more strongly Gabb \ 



callous ; umbilicus small. 



