80 LIMACIDA. 
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. 
PuHospHorax, Webb and Bertholet, 1838. 
Distr.—P. noctilucens, 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? 
Teneriffe. A doubtful genus, so little do we know of it. It is 
impossible to ascertain its systematic position. 
MARIAELLA, Gray, 1855. 
Syns.—Tennentia, Humbert, 1862. Clypeicella, Val. 
Distr.—5 sp. Philippines, Seychelles Is. J. 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 mucous pore; distinct locomotive disk ; external respira- 
tory and anal orifice on the right central margin of mantle ; 
orifice of combined genital system behind and below the right 
eye-peduncle. 
Shell internal, small, rudimentary, convex above, flat below, 
apex on right posterior side, recurved. 
Jaw smooth, with median projection. Lingual membrane with 
tricuspid centrals and laterals, and aculeate, bifid marginals, in 
the typical species ; others vary. 
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, subcylindrical, tapering behind ; tentacles 
simple: mantle large, anterior, enclosing an internal shell-plate, 
which is partially exposed by 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 
