132 Descriptions of New, 



generic characters, but differing in being unilaminate, and in 

 some other points of specific value. There can be no doubt 

 that these ought to be formed into a distinct genus, to which 

 also, probably, Mr. Busk's Flustra membraniporides (Chal- 

 lenger Polyzoa, p. 54) belongs. He, however, neither 

 figures nor describes the marginal bundle of radical fibres, 

 which, however, may (as in Menipea) not be of generic 

 value. Flustramorpha, if Busk's species are rightly referred 

 to that genus, has a totally different zooecial structure. 



C. ligtblatum, n. sp. - Plate I., fig. 3. 



Zoarium unilaminate ; branches narrow, dichotomously 

 divided. Zooecia multiserial; a small spine at each upper 

 angle. A single avicularium, with a triangular-pointed 

 mandible at the base of each cell. Ocecia rounded above 

 and slightly pointed, with a thickened margin, usually pro- 

 duced into a small point at the summit. 



Port Phillip Heads ; New Zealand, Miss Jelly. 



Differs from C. (Membranipora) roboratum in being uni- 

 laminate, the branches being very much narrower, and con- 

 sequently the rows of zocecia fewer, and in there being only 

 one avicularium at the base of a cell. 



G. spicatum, n. sp. Plate I., fig. 2.' 



Zoarium unilaminar, dichotomously divided, the branches 

 narrow. Zooecia multiserial, rhomboidal; area broadly 

 elliptical, the margin thickened, crenulated, the plate filling 

 in the lower part finely granular ; the central zooecia with 

 a spine on each side above, the marginal with two on 

 the outer angle above, the lower of which is much larger. 

 A sessile avicularium at the base of each zocecium. Ocecia 

 not prominent, nearly quadrate, a thickened band from each 

 side of the opening passing upwards and inwards, meeting 

 in the centre and produced upwards as a long sharp spike. 



Port Phillip Heads, Mr. J. B. Wilson. 



Family Eschamdj:. 



Schizoporella pulcherrima, n. sp. Plate I., fig. 6. 



Zocecia separated by narrow raised lines, broad and nearly 

 flat, surface traversed by faint lines converging from minute 

 pores or depressions at the margin ; mouth very wide, edge 

 thickened, contracted towards the base, and the lower lip 



