GASTROPODA— NA TICID7E. 



7*5 



Miocenic of Maryland. 



366. C. pileolum (Lea). (Fig. 1032, c-e.) Miocenic. 

 With strong plications, often extending to beak ; cup free at 



periphery in adult. 



St. Mary's of Maryland, Virginia, etc. 



367. C. auricula Gmelin. Pliocenic- Recent. 

 Depressed, with fine radiating, frequently dichotomous lines on 



upper surface. 



Waccamaw beds of South Carolina ; Caloosahatchie beds of 

 Florida. Living west coast of Florida to northern Brazil, 25 to 

 100 fathoms. 



Family Naticid^e Forbes. 

 CXI. Sigaretus Lam. 

 Broad-spired naticoid shell with rapidly enlarging 

 whorls, distended aperture with horny operculum, 

 and spiral surface sculpture. Tertiary-Recent. 



368. S. bilix (Conr.). (Fig. 1033.) Eocenic. 



Rotund ; umbilicus large ; spirals crowded and in 



° ' r Fig. 1033. 



pairs. Sigaretus bilix. 



Chickasawan and Claibornian of Alabama. (After Harris.) 



369. S. fragilis (Conr.). (Fig. 1034.) Miocenic. 



Fig. 1034. Sigaretus fragilis. (Md. Surv. ) 



Larger than preceding (22 mm. high), aperture about four fifths 

 of length of shell ; inner lip less prominent, umbilicus small, 

 spirals uniform, crowded. 



Miocenic of Atlantic coast. 



CXII. Vanikoropsis Meek. 

 Practically non-umbilicated shells of naticoid form ; inner 

 lip thin, smooth, adhering to columella ; surface with spirals and 

 oblique rib-like folds. 



