292 A. W. WATEES ON CHILOSTOMATOirS BETOZOA FE03I 



Loc. Orakei Bay, Xew Zealand (in Yineularia-form) ; Muddy 

 Creek, Bird Eock, Waum Ponds, Murray Cliffs, Aldinga (reticulated 

 and also a compressed branch). 



18. STEGA]sropoEELLA magn^habeis, Busk; Waters, Quart. Joum. 

 Geol. Soc. vol. xxxviii. p. 506. 



Prom the Eiver-Murray Cliffs there are specimens in the Escharan 

 and Hemescharan forms. 



In S. magnilahns the cells where division is about to take place 

 are larger than the others, so that the large characteristic cells of 

 SteganojDorella are found to be followed by two smaller ones, each 

 of which commences a new row. The same thing is seen in 

 Biflustra delicatula from the Crag, and in other species. 



With a cylindrical mode of growth, as in >S^. neozelanica, there is no 

 frequent multiplication of the rows, and no large cells are found. 



Mr. Busk, however ('Challenger' Eeport, p. 76), points out that 

 the operculum of S. neozelanica differs from that of S. magnilahris, 

 which is the case, as the former has numerous irregular bars across 

 the operculum, and four large teeth instead of the numerous small 

 ones ; and therefore I agree with him that they must be separated. 



Loc. Living : see loc. cit. p. 506, and Honoruru, Sandwich Islands 

 (20-40 fathm.) (Busk). Fossil : Miocene ; Castelgomberto ? Mouille 

 Mougnon (Cant. Yaud) ; Curdles Creek, Mt. Gambler, Bairnsdale, 

 Batesford, Eiver-Murray Cliffs (Australia) ; Waipukerau and Petani 

 (New Zealand). 



19. Stegatsopoeella Eozieei, Aud., var. ixdica, Hincks. 

 Steganoporella Eozieri, Hincks, Ann. & Mag. K'at. Hist. ser. 5, 



vol. vi. 1880, p. 379, pi. xvi. figs. 1, 1 a. 



For other synonyms see Waters, Quart. Journ. Geol, Soc. vol. 

 xxxviii. p. 505. 



In the specimens from the Eiver-Murray Cliffs, the zoarium is in 

 the Yincularia-form, with about eight series of zooecia round the 

 axis. There is a large opening replacing a zooecium, which is appa- 

 rently the aperture of a large elongate avicularium ; but from the 

 state of preservation I do not feel sure about this interpretation, 

 and possibly we have here only a broken-down zooecium. There 

 are no other avicularia. 



Loc. Living: India, Marion Islands, Holborn Islands, Darnley 

 Islands, Torres Straits. Miocene : Sollingen. Bairnsdale, Eiver- 

 Murray Cliffs. 



20. CEiBEiirN-A EADiATA, Moll. (non d'Orb.). 



For synonyms see Hincks, Brit. Mar. Polyzoa, p. 185, and Waters, 

 Quart. Journ. Geol. Soc. vol. xxxviii. p. 265. 



The specimen from the Eiver-Murray Cliffs has eight ridges on 

 each side, a suboral pore, avicularia with a wide base but elongate, 

 scattered among the zooecia, ovicell globose, about two thirds as wide 

 as the zooecia ; oral aperture 0*09 mm. wide. 



