Description of New or Little Known Polyzoa. 107 



with the outer angle turned forwards ; aperture large ; a 

 single, long, hollow, articulated spine from the outer angle, 

 and one or two from immediately behind the upper edge. 

 The first cell of the zoarium with a large number (six or 

 sev^en) of spines, and the succeeding two with three or four. 

 •No avicularia. 



A very small species, about an eight of an inch high, 

 growing on sponge. The stem consists of a few lengthened 

 internodes, with intervening round ball-like joints. 



The ap]:)ropriate name was suggested by Mr. Wilson. 



Port Phillip Heads, Mr. J. Bracebridge Wilson ; Port 

 Jackson (a young specimen), Mr. Whitelegge. 



BlFLUSTRA SERICEA, n. sp., PL V, Fig. 1. 



Zoarium encrusting. Zooecia oval or elliptical, with raised 

 finely crenulated borders, within which the aperture is 

 entii'ely membranous. A single sessile avieularium, with a 

 broad triangular mandible, situated on a space above each 

 zooecium or ocecium. Ooecia rounded, with a small, inversely 

 clavate ridge. 



Allied to B. Lacroixii and Membranipora cyclops, Busk, 

 but I believe distinct from both. 



Port Phillip Heads, a single specimen. 



BlFLUSTRA UNCINATA, n. sp., PL Y, Fig. 2. 



Zoarium adnate, hemescharine or bilaminate. Zooecia 

 large, arranged alternately in linear series, separated hj 

 raised margins, aperture elliptical, partly filled in, especially 

 below, by a narrow smooth extension of the raised margins, 

 the edge being smooth or very faintly denticulate ; on each 

 side above is a short, stout, pointed, and somewhat uncinate 

 process, from the thickened margin. 



Allied to B. delicatula and perfragilis, from which it is 

 distinguished by the stout uncinate processes. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 



SCHIZOPORELLA IMPAR, n. sp., PL V, Fig. 3. 



Zooecia elongated, irregularly arranged, separated by 

 distinct raised lines, surface covered with small hollow 

 granulations ; mouth semicircular, or slightly contracted 

 below ; lower lip straight, with a distinct, rather wide, 

 sinus ; peristome above becoming thickened, i^rojecting, and 



