14 NATICA. 



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

 adhering to the columella and bod} T -whorl, very little thickened, 

 smooth ; surface with distinct revolving lines and furrows, 

 developing on the body-whorl strong oblique grooves parallel to 

 the growth lines. F. Tuomeyana, 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 usually 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 striae. F. spirata, Sowb. 

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



This group forms a connecting-link between Vanikoro 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 only 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 stria 1 , 

 and slight spiral striee ; columellar margin slightly thickened ; 

 aperture nearly circular, peristome continuous. Carboniferous- 

 Trias. F. lirata, Phillips. 



Subfamily Naticinse-. 







Genus NATICA, Adanson, 1757. 

 Subgenus NATICA (sensu stricto). 



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



Yellowish white, closely painted 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. 



