HELICIDA. 57 
that I believe these groups have but slight value; an opinion in 
which Dr. Hartman now coincides. 
PeELTELLA, Web. and Van Ben., 1836. 
Syn.—Pectella, Peltellina, Gray, 1847, Gzeotis, Shuttlew., 
1854. 
Distr.—Brazil, Porto Rico. P. palliolum, Fer. (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 respiratory 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. 
From 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—38 sp. West Indies. P. depressa, Rang (c, 39). 
Guadaloupe. 
Sheil like Philine. Last whorl and aperture embracing nearly 
the whole shell, the spire being minute and inconspicuous; 
inferior tentacles rudimentary. 
Animal not able to retire within its shell, which occupies the 
middle of the back. Jaw like Amphibulima. 
BinneyA, J. G. Cooper. 
Syn.—Xanthonyx, Cr. and Fisch. 
Distr.—3 sp. Mexico, and islands of the southern coast of 
California. 2B. notabilis, Cooper (xcii, 73). 
Animalsublimaciform, 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, under the peristome of the shell; orifice 
of combined genital system behind and below the right eye- 
peduncle. Shell external, paucispiral, auriform, not enclosing 
5 
