LIMACID^. 81 



margin of mantle (see von Martens' figure of P. ^japi7Zaris) ; 

 orifice of combined genital system ? 



Shell-plate internal, rudimentary, flat, with a side nucleus. 



Jaw smooth, with a median projection. 



Lingual membrane Avith tricuspid centrals, bicuspid laterals, 

 and aculeate, bifid marginals. 



Urocyclus, Gray, 1864. 



Distr. — Mozambique, Prince's Isle, etc. U. Kirkii, Grav 

 (ci, 60). 



Animal 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 slightl}^ 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 onl^^ 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. B. Heynemamii, Dohrn. 



Animal limaciform, subc^dindrical, 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. 



