ALDINGA AND THE lilVER-MTJKRAT CLIFES, SOUTH AUSTRALIA. 287 



Vaginopora teocturata, Eeuss, loc. cit. p. 73, pi. ix. fig. 1. 



Memhrani]Jora Savartii^ Busk, Crag Polyzoa, p. 31, tav. ii. fig. 6. 



Biflustra JSavartii, Manzoni, Bri. di Castrocaro, p. 38, pi. ii. 

 figs. 17, 17a ; Smitt. Ploridan Biy. p. 20, tay. iv. figs. 92-95 ; Busk, 

 Kep. of ' Challenger ' Polyzoa, p. 67, pi. xiv. fig. 2. 



Biflustra delicatula, Busk, Crag Polyzoa, p. 72, pi. i. figs. 2 & 4, 

 pi. ii. fig. 7 ; Manzoni, Bry. foss. Ital. Contr. II. p. 4, pi. i. fig. 5 ; 

 MacGillivray, Zool. of Yict. decade vi. p. 28, pi. 57. fig. 2. 



For further synonymy, see Smitt's ' Ploridan Bryozoa,' to which 

 list probably several fossil Memhraniporce should be added. 



I have some rather large pieces of bilaminate Biflustra delicatida 

 from the Crag of Leiston, in which I am unable to find any denticle 

 within the lower margin, and Professor MacGiUivray draws atten- 

 tion to the fact that it exists only in two or three of the cells of the 

 Queenscliff' specimen, and is altogether absent in those from Queens- 

 land. In the Italian Pliocene fossil species I do not find it, nor 

 does it seem to occur in the Australian or IN'ew Zealand fossils that 

 I have examined ; on the other hand, in a recent specimen, in the 

 Yincularia-form, from Palm Island, it is seen in all the zocecia. 

 Smitt has called attention to the inconstancy of the tubercles in this 

 species ; and in a recent specimen from Penang, some zocecia have 

 tubercles while others are without. The recent specimen from 

 Penang has the opesia about 0*3 millim. long and 0*24 millim. 

 wide, which is slightly smaller than in the fossil adnata upon aEete- 

 pora either from Aldinga, or the Eiver-Murray Cliff. Biflustra 

 regularis, d'Orb., from Eoyan, is very closely allied, with rather 

 larger opesial openings. 



Loc. Senonian of Prance, Miocene of Austria. Crag and Pliocene 

 of England, Italy, and Sicily. Living : Plorida, 29 fathoms ; Queens- 

 cliff (Victoria) ; Port Curtis (Queensland) ; Philippine Islands, 10 

 fathoms ; Penang, &c. 



6. Membranipora radicieera, Hincks; Waters, Quart. Journ. Geol. 

 Soc. vol. xxxviii. p. 2Q2. 



In a specimen from the Eiver-Murray Cliffs there are small open 

 spaces between the zocecia. 



7. Membranipora RHTiNCHOTA, Busk. (PL YII. fig. 1.) 



Memhranipora rTiynchota, Busk, Crag Polyzoa, p. 33, pi. iii. 

 fig. 7. 



A specimen from Aldinga is in the Eschara-form. The zooecia 

 have large opesial openings. 0*3 millim. long and 0*2 millim. wide. 

 Below the opesia there is a large avicularium, with its opening much 

 prolonged, and with the end very narrow for the acute mandible. 

 The oviceU, with a keel down the centre and slightly depressed at 

 each side, is surmounted by an avicularium. 



There has been much confusion with this species, as by an over- 

 sight Mr. Busk gave a description of M. minacc as M. rhynchota 



