20 OLEACINID^. 



flattened ; columella twisted, obliquely truncate ; aperture nar- 

 row, semioval ; lips simple, submarginate within. 



Section GLANDINA (Schum.), H. and A. Adams, 1855. 

 (Euglandina, Crosse and Fischer, 1870.) Shell oblong-oval, 

 fusiform, corneous, epidermis thin, shining ; spire more or less 

 elevated, of 6 or 8 whorls; columella thin, arcuated, truncated 

 at base ; aperture rather narrow, longitudinal ; lip simple, sharp. 



Animal much longer than the shell, when extended ; oculiferous 

 tentacles deflected at the tips, beyond the eyes ; inferior tentacles 

 much shorter, also deflected; lips elongated, tentacular. Pre- 

 daceous. The largest species of the family belong to this group, 

 the shells sometimes attaining a length of over 3 inches. 

 Tropical America ; a few species in the Southern United States. 



Section POIRETIA, Fischer, 1883. Animal with feebly 

 developed labial palpi ; shell like Glandina. Europe. 



Section SELASIELLA, Strebel, 1878. Shell very small, glassy, 

 vertically striated ; columella truncated ; labial palpi wanting. 

 Stomach simple, as in Streptostyla (it is double in Glandina). 

 3 species. Mexico. 



Genus STREPTOSTYLA, Shuttleworth, 1852. 



Shell oval-oblong, subcylindrical, last whorl proportionally 

 very large ; aperture elongated, narrow behind ; outer lip simple, 

 inflected in the middle ; columella with a thickened spiral plica- 

 tion at the base. 



Animal with but slightly developed tentacles ; labial palpi 

 moderate ; foot short ; *stomach simple. 50 species. 



Tropical America. 



The shells generally resemble Oleacina, but the columella has 

 a basal fold, instead of being simply truncated. 



Section STREPTOSTYLA (typical). Shell longitudinally striated. 



Section CHERSOMITRA (Shuttleworth), Albers, 1860. Shell 

 cylindrical, smooth, shining, usually yellowish; aperture more 

 than half the length of the shell ; outer lip distinctly inflected. 



Subgenus PETENIA, Crosse and Fischer, 1868. 



Shell with lengthened spire, colnmella twisted. 

 Animal with tentacles and buccal lobes as in Glandina ; foot 

 truncated behind, having a mucus-pore at the tail. 



