58 LIMACINID.E. 



Species of Tiedemannia. 

 Neapolitana, Delle Ghiaje. punctata, Quoy and Gaim. 



Fam. LIMACINID^. 



Animal elongate, spiral ; the head indistinct ; mouth at 

 the union of the two fins and intermediate lobe, with two 

 small labial swellings ; two fin-like expansions, elongate, 

 rounded, and united at their base by an intermediate lobe 

 bearing an operculum. Mantle large, open in front, form- 

 ing a large gill cavity ; gills internal ; vent on right side of 

 mantle. 



Shell spiral, transparent. 



Operculum distinct, spiral, vitreous, of few whorls. 



These animals have been confounded by M. D'Orbigny 

 with the genus Atlanta, among the nucleobranchiate Gas- 

 teropods, which, however, have a compressed foot with 

 a sucker on the hinder edge, a distinct head, and no lateral 

 fins. The Steira of Eschscholtz, which he referred to this 

 family, is a badly observed and badly figured Atlanta ; 

 the Cirropteron of Sars is, according to the observations 

 of Allman, the larva of Buccinum undatum ; and the Belle- 

 rophina of Forbes is the shell of the larva of various 

 Gasteropods. 



Genus LIMACINA, Cuvier. 



Shell subglobose, subdiscoidal, sinistral ; spire slightly 

 raised; the last whorl with an obscure keel; axis umbili- 

 cated, keeled on the edge. 



Operculum — ? 



A%w. Spiratella, Blainv. 



