NUDIBRANCHS OF THE VANCOUVER REGION 167 



rachidian teeth; the median pair being approximately square and the 

 two lateral ones triangular. The pleural teeth are hamate and generally 

 five in number although in one case two rows had six and in another 

 several rows had but four. Outside these again are 8 uncini the inner- 

 most being roughly rectangular and the outermost more pointed and 

 thinner. The lips are guarded by a yellowish brown chitinous cuticle 

 leaving an opening in the shape of an inverted T. This cuticle passes 

 backwards as a deeply curved triangular plate. 



This species resembles in certain respects T. carpenteri (Stearns) 

 as described by MacFarland but differs in a number of points. The 

 colour is white, not yellow, with brown markings and ijn some cases 

 orange red also. The papillae on the veil are not so la^-ge and more 

 numerous. The dorsal processes are 5 in number and of a characteristic 

 shape unUke those figured by MacFarland (1. c. pi. XXVII) in T. carpen- 

 teri. The branchiae are more regular. The papillae on the dorsum are 

 not so large or so numerous. Lastly the radula is different, for although 

 the four rachidian teeth are very similar the lateral teeth are fewer and 

 more constant and the number of rows of teeth is less 20-22 as against 33. 

 The hamate teeth are 5 or rarely 4 or 6 instead of varying from 8-18 and 

 the uncini constantly 8 instead of 9-18 so that the radula is relatively 

 narrower. These various points are sufficient to justify placing it in a 

 new species. In spite of small differences, e.g., the slightly fewer rows of 

 teeth and fewer papillae on the ve;l there does not appear to be a^ny 

 doubt that this animal is the same as that described from California by 

 Cockerell and Eliot (4) as Triopha sp. As these authors point out 

 their specimen was small but 6 mm. long, and probably immature but 

 does not completely correspond with any of the described species. Their 

 description fits a small individual 6.5 mm. long that I have examined. 

 They did not deem it advisable to make it the type of a new species on 

 the material at their disposal but the step is justifiable in view of the 

 further quite mature specimens that have here been examined. I propose 

 therefore to call it Triopha elioti in recognition of the fact that attention 

 was first dilrected to it by Sir C. Eliot, K.C.M.G. 



Habitat.— It is apparently a bottom living form save that one fully 

 grown individual was obtained during the Spring tide of May 191 9 under 

 the stones on the beach of Mudge Island just above the Hmit of the 

 Zostera zone. Specimens have been dredged in from 15-30 fathoms at 

 Fairway Channel near Gabriola Island (Station 4) between Brandon 

 Island and the North end of Departure Bay (Station 18), Pylades Chan- 

 nel (Station 29), near Maude Island, Nawhitti Bar and other points. 



