NUDIBRANCHS OF THE VANCOUVER REGION 1 99 



smooth edges. Teeth simply pectinate without any median cusp or 

 division into two halves. 



Aeolidida papillosa (Linn.) 



Eolis papillosa Alder and Hancock, Brit. Nud. Mill., 1854, Fam. 3, pi. 9. 

 Aeolidia serotina Bergh, Verk. d. k. k. zool. bot. Ges. im Wien, 1874, 



p. 618-620, Taf. IX and X. 

 Aeolidia papillosa (L), var pacifica Bergh Proc. Ac. Nat. Sci. Phila, 1879, 



P- 75-77, Pl- I- 

 Aeolidia papillosa Bergh, Bull. Mus. Comp. Zool., Harvard, XXV, 1894, 



p. 127. 

 Aeolidia papillosa Eliot, Brit. Nud. Mill., 1910, p. 175. 



No attempt has been made to give the full synonymy of this species 

 which is probably that originally named by Linnaeus as the earlier part 

 of it is fully set out in Alder and Hancock, Part VI, 1854. 



Body. — -The body is elongated, ovate, abruptly rounded in front, 

 tapering to a fine point posteriorly and somewhat depressed. The 

 numerous cerata are arranged in from eighteen to twenty lateral row 

 each containing from twelve to eighteen. They reach well in front of the 

 rhinophores and are arranged obliquely, leaving the dorsum free for about 

 the front half but covering it in the posterior half of the body. They 

 extend beyond the foot all round save its hinder tip in crawling. 



Colour. — Con-siderable colour variation has been noted in this species 

 but in the specimen collected the under surface and ventrally situated 

 papillae are of a pale yellowish colour. The dorsum where clear of 

 papillae is dark brownish becoming darker as it passes forward. At the 

 front end is a patch of close set white specks arranged in approximately 

 an equilateral triangle with a notch in the middle of the front ; the two 

 anterior comers are continued as white lines out on to the oral tentacles 

 and the posterior corner continued back between the rhinophores for a 

 short distance. The oral tentacles are white flecked with black dots 

 more profuse at the base than anywhere else while the rhinophores are 

 dark brown almost black up to near the tip where there is first a band 

 of opaque yellowish white and finally a terminal transparent spot which 

 makes them appear to be hollow. The cerata are of a dull brownish 

 grey spotted with white. In some cases towards the posterior end and 

 sides the white spotting is more marked and as already noted the ventral 

 cerata are pale yellowish with some brown-grey colouration. 



Dimensions. — When alive the animal measured 58 mm. long by 17 

 mm. wide by 10 mm. high. The rhinophores were extended to a length 

 of II mm. and the oral tentacles 12 mm. 



