116 PARAPLYSIA. 
Shell white, concave within, subquadrate. Length 27 millim., width 
22. Animal about 80 long. (Smith). 
Thursday Island, Torres Straits, 4-5 fms., sandy bottom. 
Aplysia piperata Smiru, Zool. Coll. Alert, p. 89.—GILcuRIstT, 
Ann. Mag. N. H. (6), xv, 1895, p. 403, pl. 18, f. 2, 4. 
Peculiar on account of the position of the posterior tentacles, close 
to the origin of the mantle-lobes. (Smith). The lighter posterior 
end and dark encircling band described by Mr. Smith are perhaps 
due to accidental causes, as another and better preserved specimen 
in the collection shows no traces of these. (Gilchrist). 
P. mounoti Gilchrist. Pl. 21, figs. 13, 14. 
It closely resembles A. piperata in the general structure of the 
body and in coloring. It is, however, well differentiated from it: 
(1) by the absence of the prolongation of the mantle into a long 
excretory siphon posteriorly. (2) The pleuropodia also are some- 
what less developed, lie closer to the body, and evidently do not 
function as swimming-organs—compare the plicated edge of the 
pleuropodia of fig. 12, with that of fig. 13. The difference between 
the pleuropodia in the two species is most marked at their anterior 
end. (8) The coloring differs somewhat, in A. piperata there is a 
uniform sprinkling of black dots all over the animal except on the 
sole of the foot and under the mantle, showing an inclination, 
especially on the head and mantle to run into small radiating lines. 
In A. mouhoti this speckling of dark spots is absent, and there is a 
tendency rather to reticulate marking on pleuropodia and linear 
marking on head and mantle. (Gilchrist). 
Siam (Mouhot). 
Aplysia mouhoti Gricurist, Annals and Mag. Nat. Hist. (6), xv, 
May, 1895, p. 404, pl. 18, f. 1, 3, 5. 
The figures are natural size. 
A species of this genus may perhaps be indicated by the etch- 
ing of a Ceylonese Aplysia from a rude drawing by Templeton, in 
M. E. Gray’s Figs. Moll. Anim., vol. iii, pl. 270, f. 4. 
Subfamily DoLABRIFERIN# Pilsbry. 
Aplysiid in which the pleuropodial lobes are considerably united 
behind, and their forward insertions contiguous, parted only by the 
genital groove. Genital opening in front of the gill; shell calcareous 
