82 LIMACID. 
OopeLtta, Morch, 1867. 
Distr._Java, Ceylon, Cape of Good Hope, Guinea. O. nigro- 
punctata, Morch. 
Body limaciform, subcylindrical, tapering behind ; tentacles 
simple; mantle small, oval, more pointed behind; no longitu- 
dinal furrows above the margins of the foot,and no caudal mucous 
pore; no distinct locomotive disk; external respiratory and 
anal orifices on the right slightly anterior margin of the mantle ; 
orifice of combined generative system behind and under the right 
eye-peduncle. 
No internal shell-plate. 
Jaw smooth, with a median projection. 
Lingual membrane with tricuspid centrals, bicuspid laterals, 
quadrate marginals. 
The two following genera, together with Selenites, Fischer 
(Helix concava, Say), constitute the family Selenitid, Fischer, 
characterized by the dentition of Testacella united to the jaw of 
Limax. The elements thus united appear to me to be other- 
wise too incongruous. If such characters are suflicient for the 
formation of families, then Cystopelta, Tate, would require a 
new family also, having the teeth of Testacellidze with the ribbed 
jaw of Arion; and so we might multiply families ad infinitum. 
PuiutontA, Stabile, 1864. 
Syn.—Viquesnelia, Morelet (not Deshayes). 
Dist.—P. Atlantica, Morelet. Azores. 
Body compressed behind, carinated, rugose ; mantle median, 
free in front, with posterior pulmonary orifice; posterior 
extremity subtruncated, without mucous pore ; jaw without ribs 
or median rostriform projection ; teeth like Testacella. Internal 
shell-plate oblong, Ancyliform, with a rudimentary spire. 
The shell of this genus was considered by Morelet and Drouet 
a recent representative of the genus Viquesnelia, Desh., 1857 ; 
a name given to certain fossils of the nummulitic beds of Rou- 
melia. The identification is, however, imaginary. 
TRIGONOCHLAMYS, Bottger, 1881. 
Dist.— T. imitatrix, Bittg. Caucasus. 
Animal limaciform, with two dorsal and two lateral grooves, 
directed from the mantle towards the head; mantle behind the 
middle of the body very small, attached all around, granular ; 
anal and respiratory orifices behind the right margin of the 
mantie ; tail short, compressed, carinated, without mucous pore ; 
jaw similar to that of Parmacella, radula to Testacella. No 
internal shell ? 
