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PROCEEDINGS OF SOCIETIES. 
large sessile lateral avicularium opposite the centre of the cell-aperture. 
Frequently an anterior sessile avicularium between the two cells of the 
internode. Internodes distant, connecting homy 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, hut frequently 
giving off a horny, tubular tendril. At a bifurcation of the coenoecium 
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). 
Bass’s Strait; abundant; Dr. Harvey. 
3. — M. Fuegensis (Bush). 
A single specimen; Bass’s Strait; Dr. Harvey. 
4.— M. Bushii, n. s. Plate XII., Fig. 1. 
Cells elongated, attenuated downwards, three in each internode. 
Cell-mouth large, oval, oblique, the lower third filled up by a tubercu- 
lated calcareous 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. Operculum spine strong and clavate, stretching upwards 
and outwards from the lower and inner lip of the cell-aperture. Con¬ 
necting horny tube between the internodes double. Ovicell spherical, 
with a richly granular surface, imbedded among the cells, on the cavities 
of two of which it encroaches. 
Van Diemen’s Land; rather abundant, and in fine condition; Dr. 
Harvey. Hew Zealand; abundant; Dr. Joliffe. 
5. — M. tricellata (Bush). 
Bass’s Strait; very common; Dr. Harvey. 
3.—ScitupocELLAiuA (Van Beneden). 
a. —Operculatae. 
1.— S. scrupea (Bush). 
Frequent on Algse and Polyzoa. 
Bass’s Strait; Dr. Harvey. Hew Zealand; Dr. Joliffe. 
2.— S. ornithorhyncus, n. s. 
Cell-mouth rather small, oblique, a tuberculated crescentic plate 
below the lower lip. Upper margin fringed with four to five long 
