.\ro7>N 



A MONOGRAPH OF THE TEKTIARY POLYZOA OF VICTOKIA. 109 



squared denticles; a large, I'ounded elevation extending- downwards from tlie lower 

 lip and having a semicircular avicularium opening upwards. 



B.R., Mr. Hall. 



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

 on the lower lij) and the larger size and more regular form of the suhoral elevation ; 

 the avicularium also is different and ojjens upwards on the margin of the lower lip-v "''•'} 



resembling that of some species of Porella. i^. '' .^v 



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



Disco2)ora albirostris, Smitt, Eloridan Bryozoa, Pt. IL, p. 70 ; Cellepora 

 albirostris, Busk, C.P., Pt. I., p. 193 ; Waters, Q.J.G.S., 1885, p. 301. 



I have two or three specimens from Schnap^ier Point, one of the best of Avhieh 

 is figured. A full description will 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 Cellepora, except that the thyrostome has a sinus in the 

 lower lip. 



1. S. costata, McG. PI. 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 algaj or other bodies. 

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

 lofty, ai'ched above, with a deep, rounded sinus in the lower lip ; a stout, thick 

 process from the peristome on each side, surmounted by a conspicuoiis 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 Avliole length of the zorecia and frequently thickened above. 

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

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

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

 have ocEcia. 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 sculjotured area. 



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



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



