10 Rev. T. Ilincks on the 



coarse stout membrane of a black colour ; oral valve large ; 

 on each side at the top a pointed avicularium, placed on the 

 margin, depressed at the base, the beak sloping upwards, 

 mandible directed obliquely downwards ; very large avicularia, 

 slightly raised in front, with a broad triangular mandible, 

 which is bent abruptly in the middle, scattered amongst the 

 zooecia. Ocecium yery shallow, just covering the extremity 

 of the cell, smooth, with a raised rib across it a little above 

 the oral margin. Zoarucm of a deep black colour, forming 

 large irregularly spreading crusts. 



Loc. Houston Stewart Channel ; Virago Sound. 



A fine cliaracteristic species, distinguished by its dark colour 

 and its remarkably large zooecia. 



Memlranipora levata, n. sp. (PI. XIX. figs. 6, 6 a.) 



Zooecia small, oval, distinct, quincuncial ; margin very 

 slightly raised, thin, delicately crenate, the whole front closed 

 in by a smooth light-coloured and rather glossy membrane, 

 which lies very much on a level witli the edge of the cell ; 

 above each zooecium, on a somewhat quadrate area, a small 

 nodule with a pointed avicularium on one side of it, the 

 mandible directed transversely upward. Ocecium rounded, 

 smooth, umbonate. 



Loc. Houston Stewart Channel, 15-20 fms ; Cumshewa ; 

 very abundant. 



Membranipora protecta^ n. sp. (PL XIX. fig. 3.) 



Zooecia 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, tlie upper portion 

 long, slender, setiform. Ooeciu?n (?). 



Loc. Virago Sound ; Cumshewa, on shell. 



Other species, armed with more or less branching spines, 

 are : — M. cornigera, Busk, from Shetland ; M. belluJa, Hincks, 

 Australia, &c. ; 3L cervicoi-nis, Busk, Victoria ; and M. cer- 

 vicornis, Haswell *, Queensland, in which the antler-like pro- 



* This name cannot of course be retained, having been previously 

 employed by Busk. I venture to suggest as a substitute for it M. Has- 

 welUi, in recognition of the services of one of the earnest workers who are 

 doin^' so much for Australian natural history. 



