NATICID^. 13 



The Yelutinas resemble the pulmoniferous genus Otina, but 

 are strictly marine. Sometimes they are met with far out at 

 sea, but usually live among stones near low-tide. Boreal. V. 

 Isevigata, Pennant. 



? Catinella, Stache, is a synon3'm. 



Section Limneria, H. and A. Adams, 1853. 



Spire more elevated, peristome not continuous, columella 

 subcanaliculate. V. undata, Brown. 



Mo7-villia, Gray, 185Y, is a S3'non3-m. 



Section Yelutella, Gray, 1847. 



Shell in most jxart covered by the mantle, ver}- thin, flexible, 

 with short spire ; peristome continuous, thickened. V. Jlexilis, 

 Montg. 



Section Leptonotis, Conrad, 1866. 



Margin of the aperture remarkabl}^ expanded, surpassing the 

 spire. V. expansa, AVhitfield. Eocene. Alabama. 



The shell is minute, and may be embryonic. 



SciEVOGYRA, Whitfield, 1877. Struc. and Syst. Conch., iii, 350. 

 Lyosoma, White, 1883. Struc. and Syst. Conch., iii, 350. 



These two fossil groups, of doubtful relationships, maj- 

 possiblj^ be members of the Naticidae. 



Subfamily III. Vanikoridse. 

 Genus VANIKORO, Quoy and Gaimard, 1832. 



Shell subglobose, external, white, with a velvety epidermis, 

 surface striate, costate or decussate, umbilicated, without a trace 

 of callus in the umbilicus ; spire not produced ; aperture semi- 

 lunar, outer lip simple. 



Animal described in the subfamil}-. Operculum thin, corneous, 

 with apical nucleus, not spiral (PI. 1, figs. 16, 17). 



A few species are found about corals in warm seas ; fossil, 

 commences with secondarj' strata. 



About equally well-known under the later and perhaps more 

 acceptable name of Narica, Recluz, 1841. Leucotis, Swainson, 

 1840, and 3Ierria, Gray, 1842, are also synonyms. 



Section Vanikoropsis, Meek, 1876. 



Shell subglobose, thick, body-whorl large, spire low ; imper- 



