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 SMITH, Zool. Coll. Alert, p. 89. GILCHRIST, 

 Ann. Mag. N. H. (6), xv, 1895, p. 403, pi. 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. MOUHOTI Gilchrist. PI. 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. (3) 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 GILCHRIST, Annals and Mag. Nat. Hist. (6), xv, 

 May, 1895, p. 404, pi. 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, pi. 270, f. 4. 



Subfamily DOLABRIFERIN^E Pilsbry. 



Aplysiidse 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 



