CELLTJLARINE AND OTHER POLTZOA. 343 
'8. Mbnipea flagellifera, Bxislc. 
Menipea flayellifera. Busk, 1884, p. '21, pi. 4. figs. 1-1 h. Kerguelen, Marion Id., 
Straits of Magellan, W. of Falkland Is. 
ScrupocellnriaJiageUifera, Kluge, 1914, p. 615, text-fig. 5. Kerguelen. 
Jnternodes of moderate length. Usually a single external spine. Mar- 
ginal avicularia large. Frontal heterozocecia vibraculoid. 
The frontal heterozocecia of this species are so peculiar as to suggest the 
possibility that it should be placed in a new genus. I refer it to Menipea 
because it has the mode of bifurcation characteristic of the genus, the joints 
traversing the opesia of each inner zocecium. The frontal heterozocecia, 
which are constantly present, have the seta of a vibraculum, but they do not 
possess the rootlet-foramen which is always found in a basal heterozoceoium, 
whether it is an avicularium or a vibraculum. In view of the fact that in 
Amastigia avicularia and vibracula are interchangeable on the basal surface, 
a corresponding plasticity may perhaps be conceded to Menipea. The struc- 
tures in question replace the frontal avicularia of other species ; and, in 
, spite of the presence of a greatly elongated mandible, I think they may be 
regarded as avicularia. 
.9. Menipea spicata {MacGilUvray). (PL 17. fig. 19 ; PI. 18. figs. 32, 
34, 35.) 
■Craspedozoum 'spicatum, MaoGillivray, 1886, p. 133, pi. i. figs. 2, 2 a ; 1889, Prodr. 
Zool. Vict., Dec. xviii. p. 283, pi. 177. figs. 3-3 5. Victoria. 
Unilaminar. Internodes curved frontally, composed of numerous zocecia, 
'biserial at their origin, becoming 4-serial distally. Bifurcation c\'mose, 
owing to the fact that only one of the branches is jointed ; the ultimate 
branches being unilateral cymes and the larger stems being bilateral (fig. 19).. 
While the lateral internodes give off a single branch, those of the larger 
■stems give off two branches, one on each side. The proximal branch comes 
off near the commencement of the internode, and forms the commencement 
of a lateral branch. The distal branch is placed in the line of the niain 
stem, of which it forms a segment, and the distal, unjointed termination of 
the parent-internode diverges from the stem, on the same side of it as the 
proximal branch. The mode of branching of M. spicata does not seem to 
have been previously' noticed, but a similar suppression of one of the joints 
occurs also in the allied genera Notoplites and Tricellaria. The affinity of 
M. spicata to the other species which I place in Menipea is shown by the fact 
that the joint traverses the opesia of an inner zocecium. 
M. spicata has two well-developed spines on the outer side of the marginal 
zocBcia and one on the inner side ; and one spine on each side of the median 
z.ocecia. The cryptocyst is strongly developed on the proximal side of the 
■opesia, and calcareous spines project into the body-cavity from the lateral 
■walls, as in M. roborata. The ordinary frontal avicularia do not occur on all 
25* 
