A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 109 



squared denticles ; a large, rounded elevation extending downwards f lorn the lower 

 lip and having a semicircular avicularium opening upwards. 



B.B., Mr. Hall. 



This is allied to the last species, from which it differs in the internal dentieles 

 on the lower lip and the larger size and more regular form of the suboral elevation; 

 the avicularium also is different and opens upwards on the margin of the lower lip 

 resembling that of some species of Porella. 



5. C. albirostris, Smitt, sp. PL XIV., fig. 11. 



Discopora albirostris, Smitt, Floridan Bryozoa, Pt. II., p. 70 ; Cellepora 

 albirostris, Busk, C.P., Pt. I., p. 193 ; Waters, Q.J.G.S., 1885, p. 304. 



I have two or three specimens from Schnapper Point, one of the best of which 

 is figured. A full description wall be found in P.Z.V. It occurs living in the Gulf 

 of Florida and Australia and was got by the " Challenger " Expedition off Heard 

 Island. 



Schismopora, McG. 



Characters as for CellejDora, except that the thyrostome has a sinus in the 

 lower lip. 



1. S. costata, McG. PL XIV., fig. 12. 



Cellepora costata, McG., P.Z.V., 118 ; Waters, Q.J.G.S., 1885, p. 303 ; 1887, 

 p. 68. 



Zoarium encrusting, or forming small masses adhering to algae or other bodies. 

 Zocecia large, very irregular, mostly erect, surface strongly ribbed; thyrostome 

 lofty, arched above, with a deep, rounded sinus in the lower hp ; a stout, thick 

 process from the peristome on each side, surmounted by a conspicuous avicularium. 



M.C. ; B. ; C.B. ; M. A common living Australian species. 



In good specimens the surface is beautifully fluted with prominent convex ribs 

 extending nearly the w 7 hole length of the zooecia and frequently thickened above. 

 The processes supporting the oral avicularia vary in size, being usually very 

 prominent, but occasionally the avicularia are almost sessile. There are also in 

 many specimens large scattered spatulate vicarious avicularia. None of the fossils 

 have ooecia. In recent specimens they are of considerable size, extending nearly 

 horizontally from the upper edge of the thyrostome, rounded, occasionally smooth, 

 but usually with a sculptured area. 



2. S. modesta, n.sp. PL XIV., fig. 13. 



Zoarium small, encrusting. Zooecia at the margins decumbent, confused and 



