General History of the Marine Polyzoa. 331 
the peristome, the front flattened, and surrounded by an arched 
line, within which the surface is minutely pitted. The cells 
also differ in shape in the two species—those of C. bicornis 
are very much swollen below and erect ; the walls are smooth 
and entire. The large spatulate avicularia are not present in 
L. spinulosa. 
Additional Loc. Off Kast Moncceur Island, Bass Straits, 
38 fath. (Busk, ‘Chall. Rep.) ; New Zealand : Port Jack- 
son, 8 fath. ; Naples ( Waters). 
Ibid. (p. 68 sep.). 
Lunulites incisa, sp. n. 
This species seems to belong to the genus Conescharellina, 
d@Orb. <A question arises as to its specific name. Haswell 
deseribed it in 1880 as Conescharellina conica; my account 
of itappeared in 1881. So far therefore as time is concerned 
Haswell’s name has precedence. But it has been suggested 
by Mr. Waters that asa Batoyora conica and Lunulites conica 
had been previously published, Haswell’s name should be 
rejected and dncisa retained. How far this will hold good 
can only be settled when the genera of the Selenarian family 
have been more accurately determined, 
Ibid. (p. 69 sep.). 
Membranipora roborata, sp. 0. 
In the original account of this species I have left its syste- 
matic position undetermined, referring it provisionally to 
Membranipora. But I have no longer any doubt that it is 
rightly placed in this genus. Its zocecium is strictly con- 
formed to the Membraniporidan type; the mere habit of 
growth we now know to be absolutely immaterial, whilst the 
curious moditication of the radical fibres (or tubes) is asso- 
ciated with the most diverse zocecial characters and has no 
generic significance. I am therefore unable to accept Mr, 
MacGillivray’s genus Craspedozoum*, which, so far as the 
essential points in the diagnosis are concerned, is a synonym 
of Membranipora, The peculiarity in the radical tubes 
occurs in Microporella, 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 Polyzea,” part ix. fig. 4, 
