14 NATICA. 



forate ; outer lip simple, beveled, inner lip closely folded upon and 

 adhering to the columella and body-whorl, very little thickened, 

 smooth ; surface with distinct revolving lines and furrows, 

 developing on the body-whorl strong oblique grooves parallel to 

 the grow'th lines, V. Tiiomeyana, Meek and Worthen. Creta- 

 ceous ; Upper Missouri River (S. and S. Conch., t. Ixiv, f, 87). 



Section Naticodon, Ryckholt. 



Shell like Vanikoro, but inner lip usuall}- thickened, and 

 always provided with some kind of a tooth , columella either 

 slightly hollowed out or solid ; surface smooth, or ornamented 

 with various spiral or transverse stria?. V. spirata, Sowb. 

 Carboniferous, Europe (S. and S. Conch., t. Ixiv, f. 76). 



This group forms a counecting-link between Vaynhoro and Neri- 

 topsis ; the former having the columellar lip smooth, the latter 

 insinuated in the middle, or provided with two strong teeth, 

 while Naticodon has onlj^ one tooth ; as regards the thickness of 

 the shell, this transition seems equally to hold good. 



Section Natiria, de Koninck, 1881. 



Shell globose, spire short, suture profound, axis perforated ; 

 surface longitudinally plicate, with intermediate parallel striaj, 

 and slight spiral striae ; columellar margin slightly thickened ; 

 aperture nearly circular, peristome continuous. Carboniferous- 

 Trias. V. lirata^ Phillips. 



Subfamily Naticinse. 



Genus NATICA, Adanson, 1757. 



Subgenus Natica (sensu stricto). 



N. mtllepunctata, Lam. PI. 2, figs. 22, 23, 24, 25. 



Yellowish white, closel}'- laainted with small light chestnut 

 spots, umbilical region and interior of aperture light brown ; 

 umbilicus with a central entering ridge. Length, l'5-2 inches. 



Mediterranean Sea. 



Linnaeus classed this among the varieties of his N. canrena. 

 It is a variable species in its color markings, thus acquiring 

 several synonyms. Among those of the typical color-variety are 

 N. punctata^ Karsten, and N. stercus-muscarum^ Gmel. (juvenile). 

 Monterosato has named a var. minor. 



