NUDIBRANCHIATE MOLLUSCA FROM THE EASTEEN SEAS. 137 



such should be the case, this Nudibranch has a wide distribution. As I cauuot, however, 

 myself regard theni as identical, I prefer to give that now described a separate specific 

 designation . 



Genus Fryeria, Gray (1853). 



Fryeria variabilis, Coll., n. sp. (Plate X. figs. 24-28.) 



Length 2f inches ; breadth 1 J inch. Body convex, elongated, thickly tuberculated. 

 Tentacles two, situated f of an inch from the anterior margin of the body, arising from 

 simple sheaths, in which they are retractile ; the sheaths and tentacles black, the latter 

 being also finely laminated. Mai/ tie covering the head and sides of the foot, but leaving 

 tbe posterior point of the foot exposed during progression. 



Colour. — The smooth ground-portion black, but supporting a number of irregularly- 

 scattered roundish tubercles, mostly single, a few double or treble ; the tubercles largest 

 and most loosely scattered over the central dorsal region, smaller and more closely 

 clustered along the sides. The colour of these tubercles was in one specimen pinkish, in 

 others of a pale emerald-green. In all respects, however, they are evidently the same 

 species. Foot smooth, black above where visible. Under surface. — Foot dark grey 

 beneath, blackish at the sides. Head small, with two small black tentacles concealed by 

 the mantle. Underside of the mantle blackish. A row of lamelliform branchige occu- 

 pying the junction of the foot and mantle beneath all round the body, excepting only 

 the head. Anus situated under the mantle on the right side, about f inch from the 

 anterior margin. 



. Several specimens were found under blocks of coral on the reef of Palo Barundum, 

 west coast of Borneo. Animal very sluggish in its movements. 



Family SCYLLJEIVJE, Alder & Hancock (1855). 



Genus Scyll.ea, Linna3us (1758). 



Scyll^a pelagicAj Linn. (Plate X. figs. 29-33.) 



Length 1^ inch (average). Body smooth, opalescent, narrow, compressed, with two 

 broad tentacle-sheaths and two pairs of broad branchial lohes ; the posterior portion 

 raised to a crest, wedge-shaped, and notched like a cock's comb. Dorsal tentacles two, 

 lamellated, in broad and somewhat clavate compressed sheaths, straight in front and 

 finely serrated and crenatcd behind, with smooth and entire broad footstalks, the apex 

 somewhat flattened and depressed. Branchial lobes broad, flat, in two pairs, situated on 

 broad entire peduncles of nearly equal size ; externally smooth, internally having a 

 number of very delicate tree-like tufts irregularly scattered, of varying size, the large 

 below and the smaller above. Scad with a projecting crenated veil. Foot narrow, the 

 edges folding over inwardly, but when the animal crawls on glass a small portion of the 

 foot appears flattened out for the purpose. 



Colour and general appearance. — General colour yellowish brown, darker along the 

 edges of the papillary prominences and the tentacles and their connecting ridges, inter- 





