86 ARIONIDiE. 



Lingual membrane with tricuspid centrals, bicuspid laterals 

 and quadrate mai'ginals. 

 Closely allied to Anadenvis. 



Hemphillia, B1. and Binn., 18*12. 



Distr. — 1 sp. H. glandulosa, B. and B. (xcii, H). Coast of 

 Oregon. 



Animal limaciform, blunt before, swollen at centre, and 

 greatly attenuated behind ; tentacles simple ; mantle subcen- 

 tral, large, oval, concealing all but a rounded large orifice ; an 

 internal shell-plate ; longitudinal furrows above the margin of 

 the foot and caudal mucous pore, over which is a hump-like pro- 

 cess ; no distinct locomotive disk ; external respiratory and 

 anal orifices at the central right margin of the mantle ; orifice 

 of combined genital system near the right eye-peduncle. 



Cryptostrakon, W. Gr. Binn., 18Y9. 



Distr. — G. Gabbi, Binne3^ Costa Rica. 



Animal limaciform, subcylindrical, attenuated behind; ten- 

 tacles simple ; mantle slightly anterior, thin, small, concealing 

 the shell; no longitudinal furrows above the margin of the foot, 

 and no caudal mucous pore; distinct locomotive disk? exter- 

 nal respiratory and anal orifices on the right central margin of 

 the mantle ; orifice of genital organs ? 



Shell internal, sigaretiform, rudimentary, large as mantle, 

 membranous, subspiral, with postero-lateral nucleus. 



Jaw ribbed. Lingual membrane with tricuspid central teeth, 

 bicuspid laterals, and quadrate marginals. 



Cystopelta, Tate, 1881. 



Distr. — C. Petterdi, Tate. Tasmania. 



Body attached for half its length to the back of the foot ; 

 mantle very large, enveloping the whole animal in repose, but 

 from beneath which the head and the tip of the tail alone are 

 visible from above, when the animal is ci'awling; tentacles four ; 

 tail with a mucous pore at the tip ; mandible like that of Arion ; 

 liii -ual teeth resembling those of Testacella. No shell. 



Damayantia, Issel, 1814. 



Distr. — D. dilecta^ Issel. Borneo. 



Animal without shell ; mantle forming a rounded prominence 

 in the front half of the bodj'^ ; a mucous pore at the hinder end 

 of the foot. No jaw observed. 



Othelosoma, Gray, 

 Insufficiently described, resembling more the leech of Ceylon 



