o 



REPORT ON THE POLYZOA. 31 



time thought. In all the specimens that I have seen the avicularia are well 

 within the peristome, and I have not seen one in which they are erect as in Mr. Busk's 

 figure (6 c). 



Myriozoum tnincatum has the connection from cell to cell through numerous tubes 

 like the pore tubes on the outside of the zoarium. This would seem to be a characteristic 

 of Myriozoum, and diifers so much from the usual growth of Chilostomata, that I have 

 often thought a suborder should be made for it on this account, but finding the same 

 structure in Porina coronata {Haswellia australiense in Challenger Report) militates 

 against that view. 



Hasivellia (?) auriculata, Busk (PI. III. fig. 38). 



Haswellia auriculata, Busk, Zool. Chall. Exp., part xxx. p. 173, pi. xxiv. fig. 10. 

 Porina grandipora. Waters, Quart. Journ. Geol. Soc, vol xliii. p. 59, pi. vii. fig. 23. 



In a specimen from Station 135a, 7^ fathoms, the central portion of the operculum is 

 granulated, and the muscular attachments are lower down and nearer to the centre than 

 in Porina coronata. Near the base at each side there is a round thin spot, no doubt fitting 

 on to a denticle, as explained for the opercular " foramina " of Cellaria. The ovicells are 

 immersed with a thin circular area in front, but I have ndt seen the raised narrow fillet 

 as figured by Mr. Busk, and in the older cells the ovicells would be overlooked if not 

 previously noticed in the younger. I am unable to find any trace of a suboral pore, 

 but no doubt a bridge sometimes forms a " pore." This would seem to be ScMzoporella, 

 but as there is already Schizoporella auriculata, the name will have to be changed. 

 As, however, the operculum with the thin spot varies somewhat from most Schizoporella, 

 I have provisionally retained Busk's generic name. 



Since the above was written, the comparison of some specimens from New Zealand, 

 which Miss Jelly gave me as recent Porina (f) grandipora, shows that although somewhat 

 smaller, and the bridge much more developed than in the Challenger specimens, they are 

 undoubtedly identical. The operculum of the New Zealand specimens, though slightly 

 smaller, has the characters quite similar. 



From washings of the dredge between Fayal and Pico there are numerous fragments 

 of an erect cylindi'ical form, about 1 mm. in diameter, with few zooecia irregularly 

 placed. The surface is smooth and the peristome projects at each side, carrying a raised 

 triangular avicularium. In a slender specimen a bridge is formed over the aperture, and 

 then the zooecial appearance is just the same as in the specimens from New Zealand. In 

 the operculum there is a difference, as the muscular attachments are placed very high, 

 with two dots lower down, and the proximal border forms a very obtuse angle. This 

 form, which may be called var. fayalensis, also occurs off Capri. 



Habitat. — Add, New Zealand. Fossil — Napier (New Zealand). 



