114 Descriptions of JS T eiv, or Little Known, Polyzoa. 



Cellepora platalea, M ( G. Plate III, fig. 2. 



This species has been already described (Trans. Roy. 

 Soc, Vict, 1869), but not figured. 



Zoarium very small, glassy, encrusting. Cells very small, 

 rounded, irregularly heaped. Mouth slightly hollowed 

 below, but without a distinct sinus; frequently a broad, 

 suboral mucro. Avicularia with very long, slender, spatu- 

 late mandibles. Ovicells globular, with a distinct arched 

 area, with radiating grooves. 



A very minute and probably common species, distinguished 

 by the markings on the area of the ovicell, and the long, very 

 narrow spatulate avicularia. The figure is not quite 

 correctly lithographed, the lower lip of the mouth showing a 

 sinus instead of a slight hollow. 



Cellepora Costazii, Aud. Plate III., fig. 3. 



Zoarium encrusting. Cells ovate, smooth, irregularly 

 arranged, confused. Mouth wide, with a broad, rounded 

 sinus in the lower lip. Usually a prominent mucro below 

 the mouth supporting a small avicularium, and occasionally 

 an aviculiferous process from the peristome on one or both 

 sides. Numerous scattered avicularia, some very large, with 

 broadly expanded spatulate mandibles. Ovicells of moderate 

 size, with a rounded or mitriform area, bounded by a distinct 

 raised margin, pitted or sculptured in a radiate manner. 



Port Phillip Heads, probably common. 



There can be no doubt of the identity of this with the 

 European species (described also as C. Hassallii). The only 

 difference I can see in Australian specimens is that the 

 spatulate avicularia attain a considerably larger size. 



Cellepora serratirostris, n. sp. Plate III., fig. 4. 



Zoarium encrusting. Cells much confused, granulated; 

 the outer, towards the growing edge, decumbent, elongated, 

 the older more erect, stouter, and thicker, Primary mouth 

 with a deep sinus, which becomes bridged across or closed 

 by the junction of the opposite angles. A suboral process, 

 usually bending to one side, with a large avicularium at 

 the summit. Avicularia very numerous, and of various 

 forms, thickly scattered over the zoarium ; some very large, 

 with long, spatulate, blunt or pointed mandibles, raised on 



