NUDIBRANCHS OF THE VANCOUVER REGION I95 



Eliot, Notes on some British Nudibranchs, Jour, Mar. Biol. Assoc, 

 Vol. VII, No. 3, 1906, pp. 334-382; Brit. Nudibr. Moll., Pt. VIII, 

 1910, p. 168. 

 Form elongate apd slender; comers of foot produced; rhinophores 



usually smooth and wrinkled but may be perfoliate jaws with several 



rows of denticles. 



CORYPHELLA FUSCA sp. nov. 



Coryphella sp. Bergh, Proc. Ac. Nat. Sci., Philadelphia, Pt. I, 1879, p. 78. 



Body. — The body is elongated and limaciform and passes backwards 

 to a blunt tail . The back is broad and curved and marked off from the 

 almost vertical sides. The sides are sharply marked off from the foot 

 by a flange like expansion of the latter. The numerous cerata are long 

 and cylindrical and arranged in a continuous close set of double or treble 

 groups. The dorsal ones are longest while the lateral ones are quite short 

 papillae; altogether there are between 35 and 50 on each side. They do 

 not commence imtil behind the rhinophores and pass almost to the 

 posterior end leaving only a short tail. The front end is very charac- 

 teristic owing to the presence of three pairs of long processes, the rhino- 

 phores, the oral papillae and a papilla like outgrowth of the front end 

 of the foot and also the peculiar triangular shaped head shield. 



The general body colour is of a transparent grayish white. The cones 

 of the cerata are of a deep brown colour and they are capped with dense 

 opaque white. In some specimens there is a small inconspicuous crescent 

 shaped area of a dull orange colour in the mid dorsal line just behind the 

 rhinophores. A thin opaque white line runs up the posterior border of 

 the rhinophores and another on the oral tentacles, spreading out on the 

 latter in the form of a series of tiny white dots over the distal third of its 

 length. A similar opaque white line runs forward for a short distance 

 from the tip of the tail and then bifurcates to end each side at the leval 

 of the hindermost cerata. 



Dimensions. — ^The largest specimen measured preserved 19 mm. long 

 by 9 mm. wide and 9 mm. high. 



Head. — The head is transformed into a very striking triangular 

 cephalic shield with the apex directed dorsally. This apex is sometimes 

 turned up over the back looking not unlike a blunt median papilla. The 

 base of the triangle is parallel with the front edge of the foot. The mouth 

 appears as a circular opening in a triangular depression on the head shield. 

 About midway up the sides of the triangle come off two quite long oral 

 tentacles which pass upwards and outward,s. 



Foot. — The foot is fairly narrow passing off to a point behind. It has 

 a fairly wide undulating flange along eacli side. The front end is rounded 



