126 Transactions of the Canadian Institute. [vol. ix 



as in last species. Eight vasa deferentia were counted in the right gonad of 

 one individual. 



Several specimens were collected in Hecate Straits by Rev. Mr. 

 Taylor. 



C. pugetiensis (Herdman) from Puget Sound differs from this species 

 in the extent of its musculature, in having fewer longitudinal bars (3 to 4), 

 and in the direction of the dorsal tubercle (backwards). 



C. occulta (Kupffer) of Europe is still nearer this species, but the 

 short descriptions that have been given of it permit of only a few points 

 of difference being given, viz. the shape of the body and the positions of 

 the apertures. These seem unimportant, but it would be best to keep 

 them separate until they can be more closely compared. 



C. sp. 



A small specimen was obtained by Dr. Dawson in 1885 between 

 Cortez and Hernand Islands. It appears to differ from the two preceding 

 species in the extent of the musculature (the circular or transverse fibres 

 covering practically the whole body) and in the condition of the dorsal 

 tubercle (a longitudinal slit). 



C. pacifica sp. n. 



Nearly spherical, 15 mm. long, 13 mm. deep and 10 mm. thick 

 Attached by lower surface and part of right side. Siphons contracted, 

 atrial the longer. Surface overgrown with seaweed &c., the lower half, 

 at least, with radicoid filaments. In addition to siphonal musculature, 

 there are irregularly scattered fine, short fibres over the surface of the 

 body. 



About 40 tentacles, the largest slightly tripinnate. Aperture of 

 dorsal tubercle horseshoe-shaped, directed toward right side, the horns 

 approximated. Dorsal lamina short and narrow, its margin smooth; it 

 extends only a short distance behind oesophageal aperture. Seven folds each 

 side. Bars on both sides of each fold, as many as 1 1 on a fold. Stigmata 

 form the usual infundibula, each stigma extending from >^ to j^ of a 

 circle. No accessory infundibula. 



Intestinal loop narrow, bent into a semicircle. Renal organ and 

 gonads as in C. apoploa, but only 2 vasa deferentia could be seen (right 

 side). 



A single specimen was obtained at Ucluelet at low tide, attached to 

 rock. 



It differs from the preceding species in having bars on both sides of 

 each fold, and from C. pannosa of the East Coast in the direction of the 

 dorsal tubercle. There are other differences in both cases. 



