16 Mr. T. Whitelegge on Australian Polyzoa. 



the lower lip. A special pore above the mouth ; peristomial 

 orifice formed by the gradual extension of a narrow slit and 

 the removal of a portion of the calcareous lamina. Ooecia 

 external, globose. 



1. Bipora cancellata (Busk). 



Lunulites cancellata, Busk, Brit. Mus. Cat. Polyz. 1854, part ii. p. 101, 

 pi. cxiii. figs. 4-7. 



Zoarium conical, plane or slightly convex beneath ; zooecial 

 apertures rounded above, with a distinct sinus below ; peri- 

 stome elevated above, depressed below, with a circular pore 

 on its upper border ; an avicularium on each side of the mouth, 

 with a subcircular mandibular space. 



I have examined several fossil examples of this species 

 which appear to agree with Busk's description and figures, 

 and which may be identical with the form figured as h. can- 

 cellata^ Busk, by Mr. Waters in his paper on fossil Bryozoa 

 from Bairnsdale ; but both in this species and in the next the 

 identity can only be definitely settled by comparison with 

 the types. 



Loc. Living : Philippine Islands ; fossil : Muddy Creek, 

 Victoria. 



2. Bipora philippinensis (Busk). 

 Lunulites philippinensis, Busk, op. cit. part ii. p. 101, pi. cxiii. figs. 1-3. 



Zoarium depressed, conical, plane or concave beneath, 

 usually about g of an inch in diameter ; zooecial orifice elon- 

 gate, rounded above, and with a wide rounded sinus below ; 

 operculum oval; peristomial orifice ovate, the margin pro- 

 duced above at the sides, then suddenly depressed below, 

 with a subcircular pore on the upper border ; an avicularium 

 with a subcircular mandible on each side, and sometimes one 

 in front below the mouth, a number of similar avicularia on 

 the under surface of the zoarium, some on rounded elevations, 

 and others in circular depressions. Ooecia external, globose, 

 smooth, with a faint fimbriated stigma in front. 



Loc. Port Jackson. 



This species is frequently to be met with in some parts of 

 Port Jackson, and I have examined a fair number of speci- 

 mens. The surface of the zoarium is covered with a thin 

 yellowish epitheca ; and the semilunar slits which indicate 

 the growth of new zooecia are to be seen in all stages of 

 development, especially in the young. It is by a careful 



