HELICID^. 57 



that I believe these groups have but slight value ; au opinion in 

 which Dr. Hartman now coincides, 



Peltella, Web. and Yan Ben., 1836. 



Syn. — Pectella, Peltellina, Gray, 1847, Gaeotis, Shuttlew., 

 1854. 



Distr. — Brazil, Porto Rico. P. palliolum, Per. (ci, 43). 



Animal limaciform, rounded above, flat below, sides widely 

 expanded ; tentacles simple ; mantle small, oval, posterior, con- 

 cealing a shell ; no longitudinal furrows above the margin of the 

 foot, and no caudal mucous pore ; distinct locomotive disk ? 

 external respirator};" and anal orifices on the right anterior margin 

 of the mantle ; orifice of combined genital organs behind and 

 • below right peduncle. 



Shell internal, sigaretiform, rudimentary, small, flat, oblong, 

 subspiral, nucleus infero-posterior. 



Jaw ribbed. Lingual ribbon with peculiar long, narrow teeth, 

 centrals, laterals and marginals bluntly tricuspid. 



Prom Ferussac's figure 4 it appears probable that the shell 

 may be more properly described as external, but covered by an 

 accessory process of the mantle. 



The South American forms are said to be most frequently 

 found partly buried in damp earth in the woods of Brazil ; the 

 West Indian species crawl at night and in the morning on the 

 trunks and foliage of Bananas or Plantains. 



Pellicula, Fischer, 1855. 



Distr. — 3 sp. West Indies. P. depressa, Rang (c, 3^). 

 Guadaloupe. 



Shell like Philine. Last whorl and aperture embracing nearly 

 the whole shell, the spire being minute and inconspicuous ; 

 inferior tentacles rudimentar3\ 



Animal not able to retire within its shell, which occupies the 

 middle of the back. Jaw like Amphibulima. 



Binneya, J. G. Cooper. 



Syn. — Xanthonyx, Or. and Fisch. 



Distr. — 3 sp. Mexico, and islands of the southern coast of 

 California. B. notabilis, Cooper (xcii, 73), 



Animal sublimaciform, blunt before, tapering behind ; tentacles 

 simple ; mantle subcentral, covered by a shell, with an anterior 

 expansion ; no longitudinal furrows above the margin of the 

 foot, and no caudal mucous pore ; a distinct locomotive disk ; 

 external respiratory and anal orifices on the right posterior 

 margin of the mantle, imder the peristome of the shell; orifice 

 of combined genital system behind and below the right eye- 

 peduncle. Shell external, paucispiral, auriform, not enclosing 

 5 . 



