LIMACIDA. 81 
margin of mantle (see von Martens’ figure of P. papillaris) ; 
orifice of combined genital system ? 
Shell-plate internal, rudimentary, flat, with a side nucleus. 
Jaw smooth, with a median projection. 
Lingual membrane with tricuspid centrals, bicuspid laterals, 
and aculeate, bifid marginals. 
Urocycius, Gray, 1864. 
Disir.— Mozambique, Prince’s Isle, etc. U. Kirkii, Gray 
(ci, 60). 
Aninal limaciform, subcylindrical, blunt before, tapering 
behind ; tentacles simple; mantle small, anterior, with a poste- 
rior opening, and concealing an internal shell-plate ; longitudinal 
furrows above the margin of the foot and caudal mucous pore; a 
distinct locomotive disk; external respiratory and anal orifices 
on the right slightly anterior margin of the mantle; orifice of 
combined generative organs behind and below right eye-peduncle. 
Shell-plate internal. 
Jaws smooth, without median projection. 
Lingual membrane with tricuspid centrals, bicuspid laterals, 
aculeate and bifid marginals. 
Nearly allied to Parmarion; seems only to differ by the 
position of the respiratory orifice, and the want of the horn- 
shaped process to the caudal pore. 
DENDROLIMAX, Heynem., 1868. 
Distr.—Prince’s Island. D. Heynemanni, Dohrn. 
Animal limaciform, subcylindrical, blunt before, tapering 
behind, tentacles simple; mantle small, anterior, concealing an 
internal shell-plate, perforated posteriorly; longitudinal furrows 
above the margin of the foot ? a caudal mucous pore, with over- 
hanging, horn-shaped process; distinct locomotive disk: anal 
and respiratory orifices at anterior right edge of mantle; orifice 
of combined genital system behind and below right eye- 
peduncle. 
Shell-plate internal, suboval, slightly convex, small, with 
posterior nucleus and concentric lines of growth. 
Jaw smooth, with median projection. 
Lingual membrane with peculiarly shaped teeth, centrals tri- 
cuspid, laterals bicuspid, marginals aculeate, bicuspid. 
The horn-shaped process only seems to distinguish it from 
Urocyclus, the position of the respiratory orifice from Parma- 
rion. 
Dentition peculiar. 
Dr. Fischer considers this genus a synonym of Urocyclus, 
Gray. 
