NATICIDvE. Y 



Velainia, Munier-Chalmas, 1884, is a synonym. 



Section MAMILLA, Schum., 1817. 



Shell oval conic, rather thin, the whorls oblique, rapidly 

 enlarging ; white or fasciated with brown ; mouth oblong, inner 

 lip narrow, reflected, usually brown or blackish; umbilicus not 

 funiculated. A 7 , maura, Lam. 



The synonyms are Naticaria, Swainson, 1840, and Btima 

 (Chemn.), H. and A. Adams, 1853. 



Subgenus AMPULLINA, Lam. jfate Def ranee, 1821. 



Umbilicus without funiculum, sometimes open, sometimes 

 closed by a callosity ; columellar margin usually convex, the 

 umbilical region limited by a spiral ridge. 



Globularia, Swainson, is a synonym. 



Only one living species belongs in this group ; the rest are 

 tertiary fossils. 



Section AMPULLINA (sensu stricto). 



Spire short, aperture large. N. sigaretina, Lam. Eocene, 

 Paris (Struct, and Syst. Conch., t. Ixiv, f. 66). 



Ampullinopsis, Conrad, may perhaps be placed here. Globu- 

 laria, Swains., is also a synonym. 



Section AMAURELLINA, Bayle, 1885. 



Spire scalariform, elongated, sharp ; umbilicus with u narrow 

 false funiculum. N. spirata, Lam. 



Section MEGATYLOTUS, Fischer, 1885. 



Callosity of the umbilical region very large, limited by a 

 semicircular groove, distant from the columella. N. rrassatina, 

 Lam. Lower Miocene. 



Section CERNINA, Gray, 1840. 



Subglobose, polished, bright colored ; -aperture large; umbili- 

 cal region entirely covered by a convex callosity, not limited by 

 a groove ; columellar margin convex. N. fluctuata, Sowb., the 

 sole living species of this subgenus. 



Anomphala, Jonas, is a synonym. 



Subgenus EUSPIRA, Agassiz, 1837. 



Spire more or less elevated, suture canaliculated ; whorls few, 

 angulated or carinated ; umbilical fissure little marked or hidden. 

 N. canaliculate,, Morris and Lye., Oolite, England. (Struct, and 

 Syst. Conch., t. Ixiv, f. 84). 



