130 Australian Polyzoa. 



Family HIPPOTHOIDM 



Genus HIPPOTHOA, Lamouroux. 

 H. crassa. 



Cells large, much attenuated downwards, surface not 

 carinate ; opening large, margin thickened, a thick lip-like 

 projection from the lower border. Connecting tubes short. 



On stones and algse. 



This species is closely allied to H. catenularia, from which 

 it differs in the thick projection from the lower margin of 

 the mouth. 



H. distans. 



Cells small, carinate, smooth or longitudinally striated ; 

 mouth small, lower lip entire ; connecting tubes very long, 

 slender and annulated. Ovicell small, projecting from the 

 upper part of a cell. 



On stones and algse. 



This species is at once recognised by the small size of the 

 cells, the entire or slightly projecting lower lip of the small 

 roundish mouth, and the great length of the slender con- 

 necting tubes which are usually many times the length of 

 the cell. The ovicell projects from the upper part of a ter- 

 minal cell, resembling a prolongation upwards, and has a 

 short, obtuse conical process above or in front. , 



Genus ALYSIDOTA, Busk. 



A. ciliata. 



Cells ovate or pyriform ; front smooth ; mouth with four 



to six spines ; a small lunate pore below the month. Ovicell 



adpressed to the cell above, globular, smooth, grooved above. 



A single small specimen on a fragment of Bicellaria. 



Family MEMBRAMPORIDjE. 



Genus MEMBRANIPORA, Johnston. 

 M. Woodsii. 



Cells oblong, arranged in longitudinal and transverse series ; 

 margins raised ; mouth large, arched above, concave below, 

 with a blunt hollow spine on either side. Avicularium at 

 the base of a cell, mandible broadly triangular, with the 

 angles rounded. 



Portland bay, on algse — Rev. J. E. T. Woods. 



In this species, the horizontal rows of cells diverge ob- 

 liquely from a mesial line. It may be distinguished from 



