NUDIBRANCHS OF THE VANCOUVER REGION l6l 



quent exposure to light and the state of the animal when killed. This 

 is true of D. sandiegensis for while I have examined a specimen preserved 

 in April 19 12 in which the colours have remained as in the living form, 

 others collected in 1915 are white and like Bergh's specimens without a 

 trace of the spots showing, yet when they were taken they were normally 

 coloured. 



Genus Cadlina (Bergh). 



Cadlina Bergh, Proc. Phila. Acad. Nat. Sci., 1879, p. 114; Bull. Mus. 

 Comp. Zool., Harvard, XXV, p. 168. System der Nudibr, Gastero- 

 poden, 1892, p. 108; Malacol, Unters, XVIII, 1892, p. 100. 

 Dorsal surface as a rule granulate or bearing small tubercles. Rhino- 

 phores short, broad and flat. Foot broad. Labial cuticle armed with a 

 plate or band composed of minute hooks. The rachis of the radula 

 bears a median denticulate tooth; the lateral teeth are hamate and denti- 

 culate. In most species (but not in C. clarae) the verge is armed with 

 rows of minute hooks. Glans penis armed with a series of hooks. 



Cadlina marginata (MacFarland). 



Cadlina marginata MacFarland, Proc. Biol. Soc, Washington, XVIII, 

 1905, p. 43; Bull. Bur. Fisheries, Washington, 1905, p. 125, pi. XXV; 

 Cockerell and Eliot, Jour. Malac, XII, 1905, p. 35. 

 Body. — The body is somewhat flattened and elliptical being slightly 

 more pointed posteriorly. The dorsum is firm and covered with low 

 tubercles fairly regularly arranged. The mantle is thick and wide, ex- 

 tending well beyond the body all round save that the hinder end of the 

 foot may project posteriorly during locomotion. 



Colour. — MacFarland (p. 125) describes the ground colour as 

 "everywhere clear translucent yellowish white" and depicts it on 

 pi. XXV as of quite a deep yellow. All the living specimens I have ex- 

 amined in this region are of a clear translucent white with no trace of 

 yellow. The tips of all the tubercles, the rhinophores and the branchial 

 plumes are of a beautiful pale yellow colour. The characteristic marking 

 from which the species is named is a narrow band of the same pale lemon 

 colour which runs round the entire margin of the mantle and also around 

 the edge of the foot save across the anterior border. In several of the 

 specimens also there was a series of small pale yellow spots along the 

 side, in the substance of the mantle in one case nine in number and in 

 another five on each side. In spite of this there is no doubt from the 



