468 Rev. T. Hincks on the 
Membranipora protecta,n. sp. (PI. XIX. fig. 3.) 
Zoccia contracted above, expanded below, disposed rather 
irregularly in lines, set closely together, front wall wholly 
membranous; margin thickened, minutely granulous; two 
erect spines (sometimes bifid) at the top; below them on each 
side a single bifid spine, and below these two large, branched, 
antler-like spines, which meet over the aperture; numerous 
avicularia interspersed amongst the cells, placed on a distinct 
area, beak elongate, slanting upwards, traversed by a narrow 
groove, mandible with a triangular base, the upper portion 
long, slender, setiform. Occius (?). 
Loc. Virago Sound ; Cumshewa, on shell. 
Other species, armed with more or less branching spines, 
are :—WM. cornigera, Busk, trom Shetland; M. bellula, Hincks, 
Australia, &c.; M. cervicornis, Busk, Victoria; and M. cer- 
vicornis, Haswell *, Queensland, in which the antler-like pro- 
cesses are described as arising from “one side of the cell.” 
This species is also furnished with a strong vibraculoid spine 
below the area, and seems to be destitute of avicularia. ‘The 
present form is certainly distinct from all the above. 
Membranipora corniculifera, n. sp. (Pl. XX. figs. 4, 4a.) 
Zoecia ovate, much narrowed towards the oral extremity, 
expanded below, distinct; margin rather thick, granulated ; 
area occupying the whole of the front of the cell, with a mem- 
branous covering ; from six to nine tall, stout, erect spines round 
the upper part of the cell ; below them about four on each side, 
bent inward over the area, of which the uppermost pair are 
the stoutest, the rest being extremely slender and acuminate ; 
two or three very long and much attenuated spinous processes 
springing from the wall of the cell at the top, behind the mar- 
ginal spines; oral valve large, filling the narrow neck-like 
extremity of the cell above; on the outer surface of the side 
wall, a little below the top, a minute avicularium (Pl. XX. 
fig. 4a), with a pointed mandible directed outwards. Oe- 
cium small, rounded, smooth, with a horn-like process pro- 
jecting from the centre of the oral margin. 
Loc. Cumshewa, on shell. 
This species is remarkable for its wonderful array of spines. 
The position of the avicularium on the outer surface of the 
cell below the margin is also peculiar. 
* This name cannot of course be retained, having been previously 
employed by Busk. I venture to suggest as a substitute for it M. Has- 
well, in recognition of the services of one of the earnest workers who are 
doing so much for Australian natural history. 
