of Victoria and other parts of Australia. 165 



III. Gen. Diachoris, Busk. 



1. D. spinigera, n. s., pi. II., figs. 1. and 2. Cells 

 elongate-oval, entirely open in front ; three or four 

 long straight spines springing from the upper margin, 

 and a series, usually five, of long slender incurved 

 spines arising from the margin on either side; a 

 large pedunculate avicularium situate on one side 

 of the mouth; back of cells smooth ; ovicells — ? 



Wilson's Promontory, a single specimen, Dr. 

 Mueller. 



IX. Fam. Membraniporid/e, Busk. 



I. Gen. Membranipora, Johnst. 



1. M. membranacea, L. Queenscliff, on Alga3 ; War- 



nambool, Mr. Hannaford. 



In the Australian form the cells are much elongated, of 

 nearly uniform width throughout, and truncate at either end. 



2. M. pilosa, L. Queenscliff; Cape Otway, Mr. J. 



Payter ; Wilson's Promontory and Scalers' Cove, 

 Dr. Mueller. 



In all the specimens I have seen the maginal processes are 

 constantly three on each side, and the submarginal vibracu- 

 lum of enormous length, giving the specimen the appearance, 

 to the naked eye, of being clothed with long hairs. 



3. M. umbonata, Busk. Queenscliff; Kangaroo Island, 



Dr. Mueller. 



4. M. mamillaris, n. s., pi. II., fig. 3. Front of cell 



oblong, slightly punctate; margins narrow, raised, 

 smooth ; mouth very narrow, lofty, with thickened 

 margin, and a short, thick, mamilliform process on 

 either side. A single large avicularium on the front 

 of the cell interiorly; mandible triangular, pointed. 

 This species is nearly allied to M. umbonata, from which it 

 may be distinguished by the different form of the avicula- 

 rium. Like the last also, it presents a striking resemblance 

 to a Lepralia in the radiate disposition of the cells. Colour, 

 purple. 



Queenscliff, on sea-weed. 



5. M. cervicornis, Busk. Port Phillip, encrusting a 



species of Sargassum. 



