790 MrSS HELEN I'lXELL OS 



somewliat sickle-sliaped setfe (fig. 5 c). These setre were, iin- 

 fortunately, not examined before being preserved, and as 

 St.-Joseph (24. p. 338) points out, a lengthened immersion in 

 alcohol tends to reduce the curve of the sickle. 



In general structure this species resembles F. capensis Mcintosh 

 (13) fairly closely, but differs in the shnpe of the seta? and 

 nncini : in the latter respect and in some other points it differs, 

 too, from P. diomedece Benedict (1). Thei^e are mnny character- 

 istics distinguishing it from F. superba Moore (19) and other 

 Pacific species that have been described. P. aiypha Bush (3) 

 might possibly be a young specimen of this same species. 



Genus Chitinopoma Levinsen (10), 1883. 



Generic characteristics : — 



1. No thoracic membrane. 



2. Collar seta? with fin -like expansion at base of blade. 



3. Some of the other thoracic seta^ are siclde-shaped. 



4. Abdominal seta^ geniculate. 



5. Uncini with 9 or 10 fine teeth, the anterior one being 



larger and blunter than the others. 



6. Operculum with horny plate. 



6. Chitinopoma greenlandica. (PI. LXXXVIII. figs. 6 a-6 e.) 



Serpula triqueter Fabricius (7), 1780. 

 Hydroides norvegica var. grdnlandica Morch (20), 1863. 

 Hydroides (?) gronlandica Malmgren (14), 1867. 

 Chitinopoma fahricii Levinsen (10), 1883. 



Specific characteristics : — 



1. Bodies elongated, somewhat cylindrical. 



2. About 6 pairs of branchi;>? with ends fi-ee from pinnse. 



3. Operculum enclosing central stalked vesicle. 



Numerous specimens from Departure Bay and neighbourhood, 

 one incomplete one from Victoria. In thick sinuous tubes 

 adherent to shells, stones, etc., and having a very conspicuous 

 dorsal keel generally ending in a spine oveilianging the apertiu-e. 

 One tube was U-shaped with the two ends close together. The 

 largest specimen was about 12 mm. long (fig. 6 «). The whole 

 animal was practically colourless, the pedicle of the operculum 

 and the branchiae sometimes having faint ti-ansverse bands, and 

 the contents of the alimentary canal were in some specimens 

 dark red. 



The branchiae varied very much in number (from 6 to 8 in each 

 lobe) and some were frequently found in a rudimentary state : 

 one specimen had 7 in the right, and only 3 fully-developed 

 functional ones in the left. The operculum was in every case 

 on the left dorsal side, and I have found no trace of a secondary 

 one on the other side. 



