304 A. W. AVATEKS ON CHILOSTOMATOrS BEYOZOA FROM 



which the zooecia are formed, and in this respect and the shape and 

 size of the zooecia it much resembles C. fossa, Haswell ; but no 

 avicularia are found on the colony. I have a small globular colony 

 (4 millims. diam,) from the Crag of Leiston, with the oral apertures 

 of about the same size, and a similar plate directed inwards. This 



Pig. 1. — Zooecia of Cellepora divisa, sp. n., showing apertures. 

 (Enlarged 2b diam.) 



Crag fossil has a rostrum below the aperture with a terminal avicu- 

 larium, and has plain globular ovicells. Possibly this is the armed 

 condition of the present species. 

 Loc. Mt. Gambler. 



63. Cellepoea mamillata, Busk. 



Cellepora mamillata, Busk, Cat. Mar. Polyzoa, p. 87, pi. cxx. 

 figs. 3,4, 5 ; Eidley, Proc. Zool. Soc. 1881, p. 54. 



Cellepora mamillata, var. atlantica, Busk, Chall. Rep. Polyzoa, 

 p. 199, pi. sxxv. figs. 4, 5, 13. 



In a specimen from the River-Murray Cliffs the zoarium incrust- 

 ing a sheU is raised into large prominent mamilLations. Oral 

 aperture nearly round, flattened below, about 0-18 millim. diameter. 

 Avicularia projecting above the zocecia, with large triangular man- 

 dibular openings on the median line on the internal aspect. 



The mamillation of the zoarium occurs in a very large number 

 of Celleporoe and cannot be looked upon as a character of specific 

 value. C. mamillata only differs from C. pumicosa, Busk, in the 

 shape of the aperture. 



Loc. Living : Coast of Patagonia ; A^ictoria Bank, S.E. Brazil ; 

 Crozet Island, off Bahia ; jS"ew Zealand {Hutton) ; Yictoria {MacG.). 

 Fossil : River-Murray Cliffs. 



64. Cellepoea aebieosteis, Smitt. 



Biscopora albirostris, forma typica, Smitt, Ploridan Brvozoa, p. 70, 

 pi. xii. figs. 234-239. 



Cellepora alhirostris, Busk, Journ. Linn. Soc. vol. xv. p. 347 ; 

 ' Challenger ' Report on the Polyzoa, p. 193, pi. xxxiv. fig. 7, 

 pi. XXXV. fig. 3. 



A specimen from the River-Murray Cliffs is dome-shaped, re- 

 sembling Lunulites. The zooecia are round, much raised, and 

 smooth ; below the oral aperture there are small oral avicularia with 

 rounded openings, but I do not find any vicarious avicularia (ony- 

 chocellaria) ; above the aperture there are two spines ; aperture 



