NUDIBRANCHS OF THE VANCOUVER REGION I97 



10-25 fathoms oflf Neck Point, Oyster Harbour, Protection Island, We^t 

 Rocks, Esperanza Inlet, between Brandon Island and the head of 

 Departure Bay, Nanoose Bay and the head of Departure Bay. 



CORYPHELLA TRILINEATA Sp. nov. 



Body. — The body is elongated and typically Aeolidiform and passes 

 back to terminate in a fairly well defined tail. The back is curved and 

 passes roimd into the almost vertical sides. The sides of the body 

 and foot are not separated by so well marked a flange as is the c^se in 

 C. fusca. The papillae are fairly numerous, approximately conical but 

 wider at the distal extremity where they terminate bluntly. They are 

 arranged in groups and the most anterior is behind the level of the 

 rhinophores. They number from 32-34 on each side. The first group 

 of cerata is composed of from 7-9. The remaining somewhat smaller 

 ones about 25 in number are in 3 or 4 very ill defined groups. A triangu- 

 lar head shield similar to that in C. fusca is lacking. 



Colour. — ^The general colour of the body and tail is a pale whitish 

 grey, and this also is true of the cerata which are however very trans- 

 parent. There is a narrow opaque white line running from the tip of the 

 tail forwards up the mid dorsal line to just in front of the rhinophores, 

 here it bifurcates and passes out practically at right angles to the blunt 

 oral tentacles over which it spreads out to form a uniform but less intense 

 covering. A similar narrow white line runs back on the side ©f the body 

 from behind the rhinophores to the tip of the tail. The cores of the 

 cerata are of a bright brick red colour and expand into a knob at the 

 end around which is a ring of darker red. The clavus of the rhinophore 

 is yellowish. 



Dimensions. — When alive the single specimen examined measured 

 6.5 mm. long by 2.5 mm. high and 2 mm. wide. 



Head. — The head is relatively large and sub globular not passing into 

 a dorsal peak at the sides it bears two wide flat almost triangular tentacles 

 not at all like those of C. fusca. 



Foot. — ^The foot is fairly narrow, wider in front and passing off to a 

 sharp point at the tail. 



Rhinophores. — The non-retractile rhinophores have no sheath and are 

 fairly long. They lie inside and in front of the first group of cerata. The 

 clavus occupies more than half the total length and is perfoliate with 

 10-12 very shallow but nevertheless distinct leaves. It terminates in a 

 bluntly rounded end. 



Radula. — ^The very pale yellow radula is narrow and composed of 

 24-26 rows of teeth, three in a row. The median tooth kas a long some- 

 what U shaped base bearing a median spine. At each side are 6 lateral 



