90 Mr. A. W. Waters on Australian Bryozoa. 



Caberea Boryi, Busk, Brit. Mus. Oat. p. 38, pi. xvi. figs. 4, 5 ; Hincks, 

 Brit. Mar. Polyzoa, p. 61, pi. viii. figs. 9-11 ; Waters, ''On the Use 

 of tlie Avicularian Mandible," Jom-n. Micr. Soc. ser. 2, vol. v, p. 774, 

 pi. xiv. figs. 9, 10, 15. 



I am inclined to think that the calcareous border below the 

 operculum should be considered of generic importance, and 

 that this is the only known representative of the genus. 

 This character, with the operculum placed diagonally, seems 

 to have been often overlooked, but was correctly figured by 

 Audouin (see his fig. 4). Mr. Hincks's figure looks as though 

 it was the opening to the ovicell, and in his description no 

 allusion is made to it. 



Loc. British ; Mediterranean ; New Zealand ; Bondi Bay 

 and Adelaide. Fossil: Pliocene of Calabria (/Se^weri^a). 



13. Caberea grandis J T^mcks. 



Caberea grandis, Hincks, Ann. & Mag. Nat. Hist. ser. 5, vol. viii. p. 50, 



pi. iii. fig. 4 ; Waters, Quart. Journ. Geol. Soc. vol. xxxviii. p. 261. 

 Caberea ritdis, Waters, ibid. vol. xxxvii. p. 322, pi. xviii. fig. 86. 



Loc. Curtis Island ; Port Phillip Heads ; Darnley Island, 

 Torres Straits, sievings from 10-30 fath. Fossil: Curdles 

 Creek (S.W. Victoria) ; Bairnsdale ; Mount Gambler. 



14. Caherea rostrata^ Busk. 

 Caberea rostrata, Busk, ' Ohalleuger ' Rep. p. 28, pi. xxxii. fig. 4. 



There is a small piece from La Perouse. A form like this 

 with a large area, covered with an integument in which is an 

 operculum of the Membraniporidan type, seems to differ con- 

 siderably from C. Boryij in which the entire chitinous opercu- 

 lum is surrounded by a calcareous border and is entirely above 

 the fornix, and would seem more closely allied to 8crupo- 

 cellaria than to G. Boryi and G. Lyalli^ Busk. I ha^e G. 

 Boryi from Bondi Bay and Adelaide. 



Loc. New Zealand ; La Perouse. 



15. Didymia simplex ^ Busk. (PI. IV. fig. 20.) 



Didymia simplex, Busk, Voyage of tbe ' Rattlesnake,' p. 383, t. i. fig. 6 ; 

 Cat. Mar. Polyz. p. 35, pi. xxxix. ; ' Ohallenger ' Report, p. 47 ; Mac- 

 Gillivray, Zool. Vict. dec. v. p. 34, pi. xlvi. fig. 6. 



In a few cases fresh branches arise from the front of the 

 zoarium, usually growing from the front of the pair of zooecia 

 below the pair where bifurcation takes place. This new 

 branch consists at first of only one zooecium, but the next 

 globulus is bicellate. Chitinous radicle-tubes grow from the 

 dorsal surface of the lower zooecia. 



