CELLULABINE AND OTHER POLYZOA. 339 
"the Craspedozoum group of Menipea. Its reference to Amastigia seems to be 
indicated by its well developed basal heterozooecia and by the complete 
•exclusion of all the zooecia except those of the marginal rows from the basal 
wall. 
12. Amastigia PATERiFORMis (Busk). 
Menipea pateriformis, Busk, 1884, p. 22, pi. 5. figs. 4, 4 a. OS Valparaiso, 2160 
fathoms. 
The type-specimen (Brit. Mus. 87.12.9.101) has not been satisfactorily 
described by Busk. It appears to be allied to A. antarctica, which it 
resembles in the absence of scutum and spines. It agrees with Amastigia in 
possessing basal heterozooecia, which may be regarded as avicularia, although 
the mandible is distally linear and rather long. The rostrum is directed 
obliquely proximally. The colony is apparently unjointed, the branch thick 
and semicylindrical, the marginal zooecia facing obliquely outwards ; a median 
row of zooecia, or two submedian rows, occurring in parts of the colony. 
Rootlets in two lateral groups. Frontal avicularia stout and prominent, the 
mandibles broadly triangular proximally, becoming narrow distally. Ovicells 
large, and distinctly long and narrow. 
2. Menipea, Lamouroux. 
Menipea, Lamouroux, 1812, p. 183. 
Craspedozoum, MacGillivray, 1886, Trans. Proc. R. See. Vict. xxii. p. 131. 
Flabellaris (pars). Waters, 1898, J. Linn. Soc. xxvi. p. 672. 
Flabellina, Levinsen, Vid. Medd. Naturh. Foren. Uopenhag-en, 1902, p. 21. 
Cellularia (pars), Busk, et auctt. 
Zoarium jointed (rarely unjointed) ; the joints, if present, traversing the 
opesia of each of the inner zooecia at a bifurcation (Types 17, 18, PL 17. 
figs. 17, 18). Branches biserial to pluriserial. Scutum wanting. Frontal 
and marginal avicularia present or wanting ; basal heterozooecia found only 
in M. vectifera. In several species a frontal avicularium may grow inwards 
into the body-cavity, instead of occupying the position normal to these 
avicularia. Rootlets associated with a bifurcation originating on the distal 
side of the joint. The rootlets are nearly always in lateral bundles, as in 
Amastigia and Notoplites. 
The genus Menipea, as usually understood, embraces a number of species 
which are apparently not nearly allied. I lay special stress, in re-defining 
the genus, on the fact that (in all the jointed species) the joint traverses 
the opesia of the inner zooecium, in each branch. This may happen in such 
a way that a portion of the opesia lies on each side of the joint (PI. 17. 
fig. 17) ; or the proximal end of the opesia may lie in the region of the 
joint (fig. 18). The relation of the joint to the opesia is implied by Busk 
(1852^, p. 21) when he states that in M. cirrata one of the lower zooecia in the 
internode is more or less aborted. 
