66 Descriptions of New, 



mamilliform processes on each side of the mouth ; a central, 

 vertically elongated pore, in the front of the zooecium; the 

 rest of the surface papillose, with the papilla usually larger 

 in the neighbourhood of the central pore ; posterior surface 

 smooth. 



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



At once distinguished from the other species by the smaller 

 a,nd narrower zooecia. The oral sinus has a slightly raised 

 border. On each side of the mouth are constantly two 

 blunt, hollow processes. It is the only species in which I 

 have seen the branches originate from the sides of zooecia. 



C. imperforata, n. sp. PI. L, fig. 3. 



Zoarium small; branches originating from the upper 

 ■extremity of each of the cells of a geminate pair. Zooecia, 

 except at a bifurcation, single, broadly vase-shaped; a wide 

 gaping avicularium (frequently differing in size and some- 

 times wanting) at each upper angle; mouth rather wide, 

 oral sinus small, and with a tumid border; two mamilliform 

 processes on each side of the mouth ; front papillose, usually 

 a few of the papillae towards the centre larger, and probably 

 when worn forming small pores, but there is no proper 

 central pore. Posterior surface smooth. Ooecia galeate 

 tubercular, either surmounting the terminal zooecium of a 

 branch or one in its continuity; in the former case the upper 

 outline rounded, in the latter a wide, gaping avicularium at 

 «ach upper angle. 



Port Phillip Heads. 



Closely allied to G. aurita, but I think specifically 

 distinct. In C. aurita there is always a distinct, large pore 

 in the front of the zooecium, usually (but not always) sur- 

 rounded by a ring of fenestrse. I have added figures of two 

 forms of G. aurita, wifch only a single central foramen ; in 

 one the lateral avicularian process is enormously developed 

 on one side of each zooecium. 



Family Membeanipoeid^. 



Amphihlestrimi hursarium, n. sp. Plate II., fig. 2. 



Zoarium encrusting. Zooecia quadrate, elongated, rounded 

 above,- separated by thick, crenulated margins; about two- 

 thirds of the area filled in by a calcareo-membranous lamina ; 



