58 ORTHALTCID^. 



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 plicate, 

 the plicae 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. 

 ruheacena, Desli. Guadeloupe. Shell resembling Succinea. 



siMPULOPSis, Beck, 1837. Shell semioval, very thin, membran- 

 aceous, paucispiral, tlie last whorl ventricose; aperture very 

 large, oblique, rounded-oval ; columella arcuated ; peristome 

 simple, sharp. A. rufovirens, Moric (c, 38 \ 20 sp. Brazil, 

 West Indies. 



Flatysuccinea, Ancey, 1881. Shell approaching Succinea. S, 

 Portoricensis, Shuttl. 



Family ORTHALICIDJE. 



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 j. 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. 



Orthalicus, Beck, 1837. 



Distr. — 32 sp. Tropical America. 0. Bensoni, Reeve 

 (xcviii, 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. 0. Dennisoni, 

 Reeve. 



Zebra, Shuttl., 1856. Narrower, apex smooth. 0. undata, 

 Brug. (xcviii, 38). 



