86 ARIONIDA, 
Lingual membrane with tricuspid centrals, bicuspid laterals 
and quadrate marginals. 
Closely allied to Anadenus. 
Hempuitiia, Bl. and Binn., 1872. 
Distr.—1\ sp. H. glandulosa, B. and B. (xcii, 74). 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 distinet 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. 
CryprostrRakon, W. G. Binn., 1879. 
Distr.—C. Gabbi, Binney. 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. Petterdt,: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 crawling; tentacles four ; 
tail with a mucous pore at the tip; mandible like that of Arion; 
linzual teeth resembling those of Testacella. No shell. 
DamayaAntTIA, Issel, 1874. 
Distr.—D. dilecta, Issel. Borneo. 
Animal without shell; mantle forming a rounded prominence 
in the front half of the body; a mucous pore at the hinder end 
of the foot. No jaw observed. 
OTHELOSOMA, Gray. 
Insufliciently described, resembling more the leech of Ceylon 
