80 LIMACID^. 



lava with which these islands are covered ; they are herbivorous, 

 and during the rainy season, especially in the night, they quit 

 their retreats and commit great havoc in the gardens. The 

 peasants destroy them by thousands, but, notwithstanding this 

 persecution, their numbers do not appear to diminish. 



Phosphorax, Webb and Bertholet, 1838. 



Distr. — P. noctiluce7is, W. and B. (ci, 61). Teneriffe. 



Animal limaciform, swollen at middle ; tentacles simple ; 

 mantle large, anterior, with a posterior, small, phosphorescent 

 disk, and concealing a shell-plate ; no longitudinal furrows above 

 the margin of foot and no caudal mucous pore shown in the plate ; 

 distinct locomotive disk ? external anal and respiratory orifices 

 on right anterior margin of mantle ;• generative orifice ? Internal 

 shell-plate thick, oval, testaceous. Jaw ? Lingual membrane ? 

 Teneriflfe. A doubtful genus, so little do we know of it. It is 

 impossible to ascertain its systematic position. 



Mariaella, Grray, 1855. 



Syns. — Tennentia, Humbert, 1862. Clypeicella, Yal. 



Distr. — 5 sp. Philippines, Seychelles Is. M. Dussumieri, 

 Gray (xcii, 78). 



Body limaciform, subcylindrical, attenuated behind; tentacles 

 simple ; mantle large, anterior, concealing the shell; longitudinal 

 furrows above the margin of the foot, meeting over a linear 

 caudal mvicous pore; distinct locomotive disk; external respira- 

 tory and anal orifice on the right central margin of mantle ; 

 oi'ifice of combined genital system behind and below the right 

 eye-peduncle. 



Shell internal, small, rudimentary, convex above, flat below, 

 apex on right ))Osteiior side, recurved. 



Jaw smooth, with median projection. Lingual membrane with 

 tricuspid centrals and laterals, and aculeate, bifid marginals, in 

 the typical species ; others vn,Yy. 



The swollen central portion of the animal seems the first 

 approach to a turbinate mass of viscera, separated from the 

 foot. 



Parmarion, Fischer. 



Syn. — Girasia, Gray (in part), 1855. 



Distr. — 10 sp. Java, India. P. papillaris, Humb. (ci,58,59). 



Animal limaciform, subcjdindrical, tapering behind ; tentacles 

 simple : mantle large, anterior, enclosing an internal shell-plate, 

 which is partially exposed b}^ a posterior opening ; distinct loco- 

 motive disk? longitudinal furrows above the margin of the foot 

 and caudal mucous pore, over which is a horn-shaped process ; 

 external, anal and respiratory orifices on the posterior right 



