Polyzoa of Queen Charlotte Islands. 29 



quite to the centre of the cell. Not unfrequently short tubes 

 alternate with the longer ones ; and commonly the latter seem 

 to be composed of several short tubules, which originate one 

 from the other, a little below and behind the orifice. In the 

 younger zooecia the tubules are, I believe, on the surface ; but 

 they are soon overgrown by the calcareous crust, and in older 

 states they are completely concealed by it. In highly calci- 

 fied colonies this feature disappears, and the cells present a 

 uniform opake surface. It is difficult to form a conjecture as 

 to the precise import of the tubular system, and the more so 

 as there has been no opportunity thus far of tracing the 

 growth of the cell-wall and the mode in which the tubules 

 originate. 



The numerous oral spines seem to be developed round the 

 primary orifice, and are inclosed by the wall of the secondary 

 orifice, above which they project. 



The primary cell of i¥z(cr(9ne//a spinosissima closely resembles 

 that of M. Peachii. [See note on page 42.] 



Ketepora, Imperato. 

 Retej>ora WaUichiana, Hincks. 



Houston-Stewart Channel, 15-20 fms. 



[Spitzbergen, 20-80 fms., Finmark, Godhaab, 150 fms.] 



This form was first described by Smitt * as a variety of R. 

 notojxichi/s, Busk, a Crag fossil. Some years later the exa- 

 mination of specimens obtained by Dr. Wallich in Davis 

 Straits convinced me that it was a distinct species, and it was 

 accordingly described as such {' Annals ' for Jan. 1877, 

 p. 107), with the name which Mr. Busk had already assigned 

 to it in MS. 



B. WaUichiana, when fully developed, forms intricate 

 convoluted and cliambered masses of considerable size. It is 

 one of the many arctic species which have migrated to the 

 Queen Charlotte Islands. 



Family Celleporidae. 

 Cellepora (part.), Fabricius. 

 CeUepora incrassata, Lamarck. 



Houston-Stewart Channel; Virago Sound, incrusting the 

 stems of Hydrozoa. 



[Finmark, Spitzbergen, Greenland, Banks of Newfound- 

 land.] 



* "Kritisk forteckn. ofver Skandinavien's Hafs-Bryozoer," CEfvers. 

 Kongl. Vetensk. Akad. Forhandl. 18(37, Biliang. 



