58 ORTHALICIDA. 
the animal. Jaw ribbed. Lingual membrane with tricuspid 
central teeth, bicuspid laterals, and quadrate marginals. 
The animal has the peculiarity during estivation of forming a 
testaceous covering extending from the peristome over the 
parts not protected by the shell. 
The body is not attached its whole length to the foot, the 
viscera forming a turbinate spiral mass, partially protected by 
the shell. 
AMPHIBULIMA, Blainv., 1825. 
Distr.—8 sp. West Indies. A. patula, Brug. (c, 37). 
Shell oval, ventricose, rugose, membranaceous, paucispiral ; 
spire small; last whorl very large, angular; aperture very large, 
rounded-oval ; peristome acute. 
Animal capable of withdrawing into its shell. Jaw plieate, 
the plice angulated at the centre; central tooth very long, 
middle cusp of the lateral teeth swollen; marginals short, 
tricuspidate. 
RHODONYX, Fischer, 1873. (Mastogyra, Ancey, 1881.) A. 
rubescens, Desh. Guadeloupe. Shell resembling Succinea. 
SIMPULOPSIS, Beck, 1837. Shell semioval, very thin, membran- 
aceous, paucispiral, the last whorl ventricose; aperture very 
large, oblique, rounded-oval;. columella arcuated; peristome 
simple, sharp. A. rufovirens, Moric (c, 38). 20 sp. Brazil, 
West Indies. 
Platysuccinea, Ancey, 1881. Shell approaching Succinea, S. 
Portoricensis, Shuttl. 
Famity ORTHALICID 4”. 
Shell bulimiform, thin, ventricose. Jaw with a triangular 
median portion, and on either side oblique imbricating plates, 
free in front and adhering behind (xiii, 58). Central and lateral 
teeth quadrangular at base, with broad central and rudimentary 
lateral cusps; marginal teeth bicuspidate. Living upon trees, 
and secreting during the dry season a thick coriaceous epiphragm. 
OrtTHALICUS, Beck, 1837. 
Distr.—32 sp. Tropical America. O. Bensoni, Reeve 
(xeviii, 37). 
Shell imperforate, oval, conic; whorls seven or eight, the last 
longer than the spire; aperture rounded-oval; columella nearly 
straight, but little thickened ; peristome simple; lips united by 
a thin callus. 
Sultana, Shuttl., 1856. Inflated, apex pitted. O. Dennisoni, 
Reeve. 
Zebra, Shuttl., 1856. Narrower, apex smooth. O. undata, 
Brug. (xeviii, 38). 
