KLIOT : NUDIHRANCHS FROM THE INDO-FACIFlC. 89 



are quite smooth, without any trace of denticulation, and as in 

 Bergh's figures of Elysla faustula [^^^Ma.]. Untcrs.," Semper' s Keisen, 

 Heft iv., plate xxii,, figs. iS-iy). 



Tliis form appears to be Bergh's E. faustiila. It is distinguished 

 from E. gratidifolia by having an oval pericardial prominence and 

 perfectly smooth teeth. The distinction from E. inarginata (Pse.), 

 E. iiigKopundata (Pse.) and E. punctata Kelaart, which are probably 

 all varieties of one species, is not so clear. All have smooth teeth, as 

 far as is known, and a varying coloration. One of Semper's specimens 

 oi E. faustula \^2i^ almost without markings and borders. It would 

 seem that E. faustula is larger and more leaf-like in appearance than 

 E. niarginata, etc., and also has more distinct and more prominent 

 veins. 



C. jAPxiiNIiSE NUDIBRANCHS. 



Melibe pilosa Pease. 



Pease, ''Moll, from Sandwich Islands," Proc. Zool. Soc, vol. 28, 

 i860, p. 33. C.f. Melibe papiliosa, Tapparone-Canefri, "Zool. della 

 Magenta," Mem. d. R. Accad. Torino, 1876, pp. 219-222. Bergh, 

 Zeitschr, Wiss. Zool., 1885, pp. 145-154. 



One specimen seen alive at Misaki. It was about sixty millimetres 

 long, pellucid but mottled everywhere with opaque white and various 

 tints of chocolate and yellowish-brown. Foot whitish. The upper 

 surface, and especially the back between the cerata, is covered with 

 short thread-like appendages which are white and bear thread-like 

 l)ranches. There are also soft irregular tubercles especially on the 

 cerata. On the left side are six fan shaped cerata, convex extern- 

 ally and bearing similar branched thread-like appendages on the 

 margin. On the right side are only three cerata ; there are indica- 

 tions of two having been lost but it does not appear that there were 

 more than five originally. The first pair are very large, the last very 

 small. The tips of the rhinophores are yellow and pcrfoliated ; 

 considering the size of the animal the sheaths are not large or con- 

 spicuous. Tlie hood is of moderate size and in the living animal the 

 opening is ventral. Its edge is surrounded by three to four rows of 

 tentacular processes two to three millimetres long and quite distinct 

 from the thread-like appendages. The foot is pointed at both ends and 

 projects slightly in front. It is very narrow but the animal can adhere 

 strongly. It was not observed to swim but was perhaps moribund 



A rough dissection of the alimentary canal was made while the 

 material was fresh. An unusually short tube leads from the bottom 

 of the funnel-shaped hood into a small stomach. It is almost straight 

 but contracts a little before entering the stomach. The lips and 

 upper portion of this tube are black, the lower part is white and 



