Polyzoa of Queen Charlotte Islands. 39 



variety. But in a paper read before the Royal Society of 

 Victoria, October 12, 1882, MacGillivray states that further 

 examination has led him to identify this species with his Mem- 

 hranijjora serrata, which is certainly quite distinct from the 

 North-Pacific form. I shall therefore characterize the latter as 



Me7nhranij)ora pallida^ n. sp. 



Zocecia elongate-oval, front wall wholly membranous, quin- 

 cuncially disposed, margin thin, smooth, usually slightly 

 elevated at the top ; an erect spine on each side above and from 

 six to eight slender pointed spines down each side, which in- 

 cline inward ; generally at the bottom of the cell, on a small 

 quadrate area, an avicularium with an expanded base (occu- 

 pying the area) and a very long, slender, tapering beak, 

 which stretches upward along the margin ; mandible trian- 

 gular below, above setiform. Ooecium (?). 



Zoarium whitish, texture delicate. 



Virago Sound ; spreading luxuriantly over shell. 



Memhranipora exilis, n. sp. 

 [See page 9.] 



On further examination of this species I find that it agrees 

 with M. 7-adicifera, Hincks, in being attached (in some cases 

 at least) by radical tubes given off" from the dorsal surface. 

 It is not closely adnate to the surface on which it grows, as 

 most of the ISlemhraniporce are, but is furnished witli special 

 organs of attachment. The first specimen which came under 

 my notice (and on which my description was based) is grow- 

 ing on Cellaria borecdis, the stem of which it loosely invests j 

 in this case I have not been able to detect any of the dorsal 

 appendages. But on a colony which spreads over a Tuhuli- 

 pora they are present in great numbers, and there can be no 

 doubt that it is anchored by the radical tubes and not adhesive. 

 In both cases the dorsal surface of the cells is convex and 

 rounded, and clearly unfitted for direct attachment. Probably 

 the presence or otherwise of the appendages is dependent on 

 the nature of the habitat. 



I have already (' Annals ' for July 1881, p. 5, under Mem- 

 hranipora radicifera) drawn attention to certain links con- 

 necting the Membraniporidan series with such forms as 

 Bugula and Diachoris. We have another such link in the 

 present species. A Memhrani-pora which, from the nature of 

 its habitat, had ceased to be adherent and had developed 

 radical fibres as a means of attachment, would have made a 

 very decided advance towards the Bugulan type. 



