ZOOPHYTOLOGY. 151 
opening. I have not seen M. Patagonica (Busk), and from 
the figure Iam more doubtful as to its position. All the 
species are distinguished by the presence of one or more 
sessile avicularia on the front of the cells, and by the re- 
markable hollow curved spines attached round the upper lip 
of the cell-mouth by horny joints. 
This group does not seem to “fruit” freely. I do not 
know the ovicell even in our common British species, M, 
ternata (Ellis) ; but fortunately Dr. Harvey’s collection con- 
tains a branch of M. Buskii from Bass’s Strait, bearing 
several; globular, the surface granulated, immersed among 
the cells in the middle of the internode. One can scarcely 
doubt that all these closely allied forms have similar repro- 
ductive organs, and, if so, the ovicells will give an excellent 
generic character. 
M. triseriata (Busk) and M. multiseriata (Busk), which 
have their ovicells galeate and superior, like those of Scru- 
pocellaria, must seek other congeners. é 
I do not consider it necessary to subdivide the genus. 
1. MW. cyathus, n. sp. 
Cells very short and round; two in each internode, one a little above the 
other; cell-mouth large, oyal, oblique; rim slightly thickened, five to six 
spines round the upper and outer margin; the lower three, large, curved, 
hollow, and pod-like, attached by a horny joint to the thickened lip. 
Opercular spine expanded, branched, spreading downwards and outwards 
from the upper and inner lip of the cell-mouth. A large sessile lateral 
avicularium opposite the centre of the cell-aperture. Frequently an ante- 
rior sessile avicularium between the two cells of the internode. Internodes 
distant, a connecting horny tube extending from the apex of a pair of cells, 
upwards and backwards, and slightly dilating as it enters the lower cell of 
the succeeding pair by its anterior aspect. 
There is constantly on the front of the upper of the two cells a ring-like 
marking, usually filled up with a calcareous plate, but frequently giving off 
a horny, tubular tendril. Ata bifurcation of the ccencecium a third cell is 
introduced into the primary internode between the two secondary branches. 
Ovicell unknown. 
A delicate parasitical species, twining its long tendril-like 
branches round zoophytes and red sea-weeds. 
Bass’s Strait; Dr. Harvey. Port Fairy; Mr. Dawson. 
2. M. crystallina, Gray. 
3. M. Fuegensis, Busk. 
4, M. Buskii, n. sp. 
Cells elongated, attenuated downwards, three in each internode. Cell- 
mouth large, oval, oblique, the lower third filled up by a tuberculated calca- 
reous plate; upper lip prolonged, and fringed with from four to five spines, 
attached to the lip by horny joints, and one of them, usually the second 
from the outer edge, very long, curved, and pod-like. There is often an 
additional spine on the upper and inner margin of the cell-mouth. Oper- 
