CELLULARINE AND OTHER POLYZOA. 345 
constricted laterally, the arrangement being as in Amasliffia rudis (PI. 17. 
fig. 27), the basal wall correspondingly sinuate. Branches bordered by lateral 
groups of rootlets, as in the allied species, given off from pore-chambers at 
the proximal ends of the marginal zooecia. The terminal walls may or may 
not be provided with blister-like pore-chambers at their insertion into the 
basal wall. 
Victorian specimens, Bracebridge Wilson Coll., in British Museum, 
97.5.1.453,454. 
Waters regards this as a uiiilaminar variety of M. roborata, but I think its 
characters entitle it to specific rank. 
11. Menipea roborata (Bi)icks). (PI. 18. figs. 28-30.) 
Membranipora roborata, Hincks, 1881, A. M. N. H. (5) viii. p. 128, pi. 2. figs. .3, 3n. 
Curtis Id., Bass Straits ; 1892, Ibid. (6) ix. p. 331. 
Fhistra membraniporides, Busk, 1884, p. 54, pi. 32. figs. 7 n, 5. Port Jackson, Bass 
Straits. 
Craspedozoum roboratum, MacGillivray, 1886, p. 181, pi. 1. fig. 4 ; 1889, Prodr. Zool. 
Vict., Dec. xviii. p. 284, pi. 177. fig's. 4, 5, 5 a. Victoria. 
Flahellaris roborata (pars). Waters, 1898, J. L. S. xxvi. pp. 660, 662, 672. 
FlabelUna {Flabellaris) roborata, Levinaen, Vid. Medd. Naturh. Foren. Copenhagen, 
1902, p. 21. 
Menipea roborata {pars), Waters, 1887, A. M. N. H. (5) xx. p. 183. 
Menipea roborata, Levinsen, 1909, pp. 3, 9, 131, 132, 138, pi. 2. figs. 7 a-k {FlabelUna 
on plate). 
Bilaminar, unjointed, pluriserial, with at least 17 rows of zooecia, the 
branches bordered by marginal bundles of rootlets, widening terminally and 
assuming an almost Flustrine appearance. Basal walls of the median zooscia 
only slightly constricted, laterally, near the middle. Spines 1, 1. Crypto- 
cyst less developed than in M. ligulata. Thickening bars of ovicells uniting 
in the form of a Gothic arch and more or less acuminate ; or in a rounded 
curve, without a mucro. Frontal avicularia paired (except on the lateral 
zooecia, where the avicularium is single) close together, the rostrum directed 
obliquely proximally ; two constantly present on the distal side of an ovicell, 
widely separated, their direction reversed. Internal frontal avicularia large, 
directed nearly horizontally, on the basal side of the cryptocyst ; their distal 
end visible at the proximal end of the opesia. Rootlet pore-chambers of the 
marginal zocEcia inconspicuous. Blister-like pore-chambers on the proximal 
side of the insertion of the terminal walls into the basal wall present or 
absent. 
The synonymy shows that there has been much difference of opinion with 
regard to the generic position of the present species ; but I agree with 
Waters and others that it must be placed in Menipea. Hincks (1892) and 
Waters have both expressed the opinion that M. ligulata and M. spicata are 
varieties of this species. That it actually belongs to Menipea is indicated by 
M. spicata, which has the typical unihiminar character of the genus, while 
