ELIOT: NUDIliRANClIS FROM TIIIC 1 NDOPACIKIC. §7 



Casella atromarginata (Cuv.). 



Bergh, you ru. Mus. Godeffroy, vi., 1874, pp. 102-9 ; see also Eliot, 

 " Nudibranchs of Southern India and Ceylon," Proc. Zool. Soc, 1906, 

 p. 644. 



One fine specimen, closely resembling the animal figured by Bergh 

 (" Mai. Unters.," Semper's Reiseti, heft vi., pi. 2ilii ^g- '^) under tiie 

 name of Cayi?/Ai! philippensis. It would appear that this name was 

 only used provisionally, and tlie animal subsequently recognized as 

 identical with C. atroinarginata^ which is the name used by Bergh in 

 his later works. 



The specimen is somewhat bent, but about 42 mm. long, 27 mm. 

 broad, and 20 mm. high. It is of a stout shape, like some Chroino- 

 doriJs, but with an ample undulated mantle margin. The colour is 

 uniform clear lemon-yellow, but the mantle margin is marked by a 

 line of dark brownish-violet with a white band on either side. The 

 rhinophore sheaths have a black or dark violet border round the edge 

 but there is no border round the foot or branchial pocket. The 

 branchiae are twenty-two in number, set in a double spiral ; both they 

 and the rhinophores are lemon-yellow at the bottom and purplish- 

 brown at the top. The anterior buccal chamber is very large and 

 puckered internally, but the radula is minute, though it consists of 

 many rows, each with many teeth. It is as described by Bergh. 

 There are minute rhachidian thickenings, and the teeth which in spite 

 of their small size are strong and distinct, bear four to five denticles. 

 The labial armature is an incomplete ring, composed of minute bent 

 rods, which sometimes show a slight bifurcation at the apex. 



The species of Casella are very variable, not only in colour, but 

 also in the number of branchiae and the details of the radula. It 

 would seem that the present specimen is a C. atromarginata with a 

 clearer and brighter coloration than that usually recorded. 



Phyllidia elegans Bergh. 



Bergh, " Bidr. Monogr. Phyllidierne," p. 505, ff.. Id., " Mai. 

 Unters.," Semper's Reisen, heft, x., [). 381. 



One beautiful specimen, 72 mm. long, 34 mm. broad. The ground 

 colour is black, and the internal dorsal wall is almost uniformly 

 black, but externally this black colour is largely hidden by yellowish 

 areas, bearing tubercles, as in Bergh's figure (Mai. Unt., in Semper s 

 Reisen, pi. xxv., fig. 6). There is a well-marked l)lack line on the 

 sole, and the expanded margin of either side of the foot bears 

 another on its upper surface, accompanied by a row of dots on its 

 outer side ; these side lines and dots are not visible in the natural 

 position of the animal. The margins of the foot are stiff and bear 



