1906.] OF SOUTHERN INDIA AND CEYLON. 679 



Lmguella cinerea appear to have been pi-esented by Kelaart, 

 which is agreeable to the supposition that they represent his 

 Diphyllidia formosa and D. marviorata. 



PiiEUROPHYLLiDiA FORMOSA (Kelaart). (Plate XLII. figs, 11, 12.) 



{Diphyllidia formosa Kelaart, 1. c. II. p. 494 ; Bergh, " Anato- 

 niische Untei-suchung der Pleurophyllidia formosa" Yerh. 

 d. k.-k. zool.-bot. Gesellsch. in Wien, xix. 1869.) 



One large specimen seems to be identical with botli the animal 

 described by Kelaart and that described by Bergh. It is unfor- 

 tunately very badly preserved and the body has become soft and 

 crumbly. It is 62 mm. long and 28 broad. The shape is lingui- 

 form. The colour is yellowish white, but the frontal shield is 

 still faintly I'eddish, and the back bears traces of about 30 longi- 

 tudinal stripes. The rhinophores have also preserved their pink 

 and black coloration. The side-lamell* are almost obliterated, 

 but the branchiae are distinct and set in a deep cleft. There is a 

 longitudinal furrow in the posterior part of the foot. Of the 

 intei-nal organs only the hard buccal parts were sufficiently well 

 preserved to be examined. They appear to be as described by 

 Bergh. The jaws are large, brown, convex externally, 

 bearing on the edges many denticles which can be seen with a 

 hand-lens. The median tooth of the radula is very broad. It 

 bears four denticles on each side of the centi-al cusp, which is 

 itself slightly denticulate. The fii'st lateral is large and beais a 

 few irregular indentations. The next few laterals are smooth ; 

 after that the rest are bifid, except the three or four outermost, 

 which are again smooth. 



One of Kelaart's diuwings represents this species lying half 

 buried in sand with the head and tail exposed. I have seen 

 P. calif ornica behave in the same way, and no doubt the habit is 

 common in the genus. The sides of the mantle are held against 

 the body so as to form a tulie, through which a current of water 

 is sent over the gills and side-lamellye. 



P. formosa is allied to P. ceylanica, which has a smaller radula 

 and the outermost teeth serrulate, and also to P. cygnea and 

 P. natalensis, in which all the teeth are quite smooth. The 

 figure of P. cygnea given by Basedow and Hedley (Trans. Royal 

 Soc. of South Austraha, vol. xxix. 1905, p. 149, pi. x.) is remarkably 

 like Kelaart's drawing, and differs chiefly in representing the 

 frontal veil as colourless, not pink. 



Pleurophyllidia t^eniolata Bergh. 



(Bergh, Bidrag Monogr. Pleurophyllidierne, pp. 42-46. 

 Eliot, " Nudibranchs from the Indo-Pacific," Journ. of 

 Conch, vol. ii. no. 8, Oct. 1905.) 



One specimen of this fine species, which has hitherto been 

 recorded from Mozambique and Maskat. Length if stretched 



