General History of the Marine Polyzoa. 3.S1 



the ])eristome, the i'roiit Hattened, and sunouivded by an arched 

 line, within whieli the surface is minutely pitted. Tiic cells 

 also dilU'r in sljapc in the two species — those of ('. hicornis 

 are very nuieh swollen below and erect ; the walls are smooth 

 and entire. The large spatulate avicularia are not present in 

 h. spinulosa. 



Additional hoc. Off East Moncoeur Island, Bass Straits, 

 38 falh. {busk, 'Chali: Rep.); New Zealand; Port Jack- 

 son, 8 tath. ; Naples ( Waters). 



J bid. (p. 68 Sep.). 



Lunuliles incisa^ sp. n. 



This species seems to belong to the genus Conescharellina, 

 d'Orb. A cpiestion arises as to its specific name. Has well 

 described it in ]S80 as Conescharellina conica; my account 

 ot" it appeared in 1881. So far therefore as time is concerned 

 Haswell's name has precedence. But it has been suggested 

 by ]\lr. Waters that as a Batopora conica and Lunulites conica 

 had been previously published, Haswell's name should be 

 rejected and incisa retained. How far this will hold good 

 can only be settled when the genera of the Selenarian family 

 have been more aecuratelv determined. 



Ibid. ((). 09 Sep.). 



Membranipora rohorata, sp. n. 



In the original account of this species I have left its syste- 

 matic position undetermined, referring it provisionally to 

 Menihranipora. But 1 have no longer any doubt that it is 

 rightly placed in this genus. Its zooecium is strictly con- 

 formed to the Menibraniporidan type ; the mere habit of 

 growth we now know to be absolutely immaterial, whilst the 

 curious modification of the radical fibres (or tubes) is asso- 

 ciated with the most diverse zooecial chai'acters and has no 

 generic signilicance. I am therefore unable to accept Mr. 

 MacGillivray's genus Craspedozoum *, which, so far as the 

 essential ]K>ints in the diagnosis are concerned, is a synonym 

 of Menihranipora, The peculiarity in the radical tubes 

 occurs in Mwroporella, in Menipea^ in Schizoporella (pro- 

 bably), and no doubt elsewhere. This structure is specially 

 liable to modifications correlated with diversities of habitat, 

 and has no significance as an indication of genetic affinity. 



• " Descriptions of new or little-known Polyzoa,'" part ix. fig. 4. 



