PART II. NATICIN^E. 345 



SuB-FAM. 1. N A TIC IN .E. Sea Snails. 

 Shell globose ; * inner lip smooth, not depressed, 



Natica Lam. Operculum shelly ; shell globose ; 

 ventricose ; umbilicus open, with a central gibbous 

 ridge, or prominence. 



N. lineata. Mart. 186. f. millepunctata. lb. 186. f. 

 1864, 1865. 1862, 1863. 



Naticella Guild. Operculum horny ; shell globose, 

 but generally depressed ; umbilicus nearly filled up 

 with a vitreous deposition of the inner lip ; spire ob- 

 tuse. 



? N. aurantia. Mart. 189. f. 1934, 1935. 



Globularia Sw.f Shell not depressed, but the aperture 

 very effuse ; base of the body- whorl 

 with a thickened belt; apex of the 

 spire acute ; recent and fossil, (fig. 



sigaretina Lam. Coq. Foss. 13. f, 1. 



patula. lb. f. 2. 



depressa. lb. f. 3. 



acuminata. lb. f. 4. spirata. Coq. Foss. 13, f. 7. 



fluctuata. Griff. Cuv. 1. f, 4, crossitana. lb. f. 8. 



Mamillaria Sw. Shell oval, heavy ; spire very small, 

 pointed ; inner lip considerably thickened at the top, 

 and filling up a large umbilicus, placed near the base 

 of the aperture ; aperture effuse. 



M. lactea Sw. Mart. 189. tumida Sw. lb. 189. f. 1928 

 f. 1922, 1923. —1931. 



Sigaretus Auct. Oval, flattened, ear- shaped ; inner 

 lip almost wanting ; umbilicus none. 



T. concavus. Lam. Hist. Nat. vi. 2. p. 208. 



* The arrangement of this group, from ignorance of the animals of the 

 major part, is purely artificial, being founde <nily on the shells, 

 t Gtobuhts Sow. : altered, th.: the specific uames may not be changed. 



