

PART II. NATICIN^. 345 



SuB-FAM. 1. NATICINiE. 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. 



Glohularia Sw.-j- 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, 



106.) 



sigaretina Lajn. 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 cnly on the shells. 

 t Globulus Sow. : altered, th:. the specific names may not be changed. 



