fcLIOT : KtrnifeRANCHS fROM IHE INOO- PACIFIC. Qt 



Stomach, are a pair of yellowish, collar-shaped, transparent jaws. The 

 consistency is horny hut flexible and at tlie ends almost membranaceous. 

 Each jaw is about i'5o mm. long and o'4 mm. broad. Near the 

 hinges are a few transverse ribs. At the other end the margin is 

 irregular and presents a wavy or roughly scalloped outline. 



The specimen has lost all its cerata but its characters, as far as they 

 can be ascertained, are those of M. fimbriata. 



The jaws are embedded in the walls of the buccal tubes and are not 

 visible when it is opened. Their function must be not to cut but 

 simply to strengthen the prehensile and retentive action of the lips. 



I can discover no jaws in Alder and Hancock's type specimen 

 preserved at Newcastle but it is so decayed and fragmentary that a 

 negative result cannot be regarded as conclusive. 



Doridopsis gemmacea Alder & Hancock. 



Alder & Hancock "Notice of a collection of Nudib. Moll, made in 

 India," 1864; Hancock "Anatomy of Doridopsis," Trans. Linn. Soc, 

 vol. 25, 1865. 



}=-Doridopsis denisoni (Angas) see Bergh " Mai. Unters.," Semper' s 

 Reisen, Heft xv., p. 694. 



Ten specimens seen alive at Misaki. The largest was about fifty 

 millimetres in length but varying in shape and capable of considerable 

 elongation. The ground colour is essentially the same in all specimens, 

 though it varies in tint and intensity from a pale yellowish-brown to a 

 rich chocolate-brown. The margin of the mantle is thin, undulated 

 and mobile; marked by a white line which sometimes sends inwards 

 a few short stripes. The medio-dorsal area is bounded on either side 

 by three large compound tubercles. They are mobile and contractile 

 especially those nearest to the branchise, which seem to pulsate in 

 harmony with the heart. On the back are distributed darker brown 

 areas, bearing one to three bright, metallic, blue spots. In one 

 specimen there are as many as six blue spots on the areas. There are 

 generally three median areas between the branchiae and rhinophores, 

 and six on either side, besides one behind the branchice and one in 

 front of the rhinophores. Between the rhinophores are two tubercles. 

 The dark brown areas are comparatively free from tubercles but the 

 rest of the back is more or less covered with them. Most of them 

 are small and simple but the outermost, which are arranged in a circle 

 round the mantle edge, are larger with faint indications of a composite 

 structure. The rhmophore pockets are slightly raised but quite 

 smooth. The rhinophores consist of very tall, smooth, semitransparent 

 stalks which bear at the tip about twenty-five fine brownish perfolia- 

 tions. The edge of the branchial pocket is smooth, though its sides 

 bear tubercles like the rest of the back. The branchiai are five in 

 number, very ample and delicate, so large that they cannot be com- 



