Species o/'Aplysiidgeyz-o/n Jamaica. 219 



I did so, as in alcohol (which was not too strong) it presents 

 a shapeless mass which would defy description. Probably it 

 is for this reason that the creature has not hitherto been 

 described. 



Owing to the absence of a shell and other characters the 

 animal must be referred to the genus Aclesia, Rang, which 

 has been considered peculiar to the East Indian region. 



Aclesia intraptcta, sp. n. 



Length about 4^ inches. Body swollen, subglobose ; foot 

 flattened, posteriorly broad, terminally acute. Neck sub- 

 cylindrical, moderately thick. Anterior pair of tentacles 

 large, branched, antler-like, retractile. Posterior pair large, 

 cylindrical, somewhat tapering, hollow, with open truncate 

 ends, and with two whorls of spine-like soft lateral branches ; 

 these and the other tentacle-like processes on the body are 

 also retractile. On the middle line of the neck, between the 

 pairs of tentacles, is a short but broad branched filament. 

 Epipodia contiguous in the middle line, but with the anterior 

 and posterior parts separating alternately, forming wide 

 cavities, in respiration. The anterior of these cavities serves 

 for inspiration, the posterior for expiration, and the whole 

 respiratory cycle takes about five seconds. Quite a jet of 

 water can be thrown from the posterior orifice. Sides of 

 epipodia and body with many branched processes, some sliort, 

 others long, the largest resembling the anterior cephalic 

 tentacles. On the sides of the epipodia are three longitudinal 

 series of these processes — one dorsal, one subdorsal, one lateral 

 or subpedal. Each row numbers four processes, and the rows 

 are so placed that, as a general rule, the processes of the 

 dorsal row are more posterior than the equivalent ones of the 

 lateral row. Sides of foot with many processes. 



Colour. — Prettily marbled with black and pale grey, 

 dorsal portions of epipodia and sides of neck with most black. 

 Most of the tentacles or processes tinged reddish, the larger 

 ones mottled with white. Inside of epipodia grey with white 

 dots. Sole finely speckled all over grey and white. 



Described from a living specimen. 



The anatomy, so far as examined, agrees in all important 

 points with that of ApJysia. The narrow white fore-gut 

 enlarges rapidly to form the big gizzard, which is pale red in 

 colour. In this gizzard I found four (and a fifth rudimen- 

 tary) little bodies, more or less triangular in outline, about 

 5 millim. diam., colour pale yellowish brown. These, like 

 those described by Prof. Ray Lankester in Aplysia, are no 



