ALDlNGrA AND THE RIVER-MURRAY CLIFFS, SOUTH AUSTRALIA. 297 



Loc. Curdies Creek ; Mt. Gambler ; Bairnsdale ; Muddy Creek ; 

 Spring Creek ; River-Murray Cliffs. 



36. PORINA CORONATA, Eeiiss. 



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

 p. 333, to which add : — 



Escliara gracilis, MacGillivray, Nat. Hist, of Yict. decade v. p. 40, 

 pi. xlviii. fig. 3 ; Busk, ' Challenger ' Report, Zool. pt. xxx. p. 141, 

 pi. xxi. fig. 6. 



Porina gracilis, Hincks, Ann. & Mag. Nat. Hist. 1881, p. 60, 

 pi. iii. fig. 5. 



Haswellia australiensis, Busk, loc.cit. p. 172, pi. xxiv. fig. 9. 



Before describing Porina coronata from Curdies Creek (Quart. 

 Journ. Geol. Soc. vol. xxxvii. p. 333. I had received from Mr. 

 Haswell specimens of his Myriozoum {Haswellia) australiense^ in 

 which the peristome is tubular, often entirely surrounded by openings 

 which are either simple pores or have avicularian covers. There is 

 great irregularity in these peristomial pores or avicularia, so that 

 very frequently there is only an avicularium below the aperture ; in 

 other parts in the same colony there may be two or three at the 

 side ; in others they regularly surround the aperture. Sometimes 

 the peristome is flattened on the distal edge. The central pore 

 (median pore) is usually only a rounded aperture ; at other times in 

 the same colony from Holborn Island (collected by Mr. Haswell) it 

 has a tubular projection ; to show an extreme case, I figured from 

 Curdies Creek a very delicate specimen with very marked tubular 

 pores ; and upon reexamination, I find that from such a specimen to 

 the large flat growth there is no break in the series, so that I feel 

 quite convinced that the determinations then made were correct. 



The opercula of the specimen sent as M. australiense are slightly 

 smaller than those from typical K gracilis, but the shape is the 

 same, and so is the attachment of the muscles. As the ridge for the 

 muscular attachment is characteristic, and diff'ers from any other 

 with which I am acquainted, this species may be made a test case, 

 showing that the modern classification is an advance upon that which 

 laid the greatest stress on the mode of growth. In both fossil and 

 recent specimens the pore is sometimes elongate, sometimes round. 



The fossils from the River-Murray Clifis, Aldinga, and Adelaide 

 are all either in the form b, as vertebralis (see Bry. from S.W. 

 Victoria, p. 334), or are a little fiattened. 



37. Lepralia edax. Busk. 



Cellepora eclaoc, Busk, Crag Polyzoa, p. 59, pi. ix. fig. 6, pi. xxii. 

 fig. 3. 



Le'pralia edax, Hincks, Brit. Mar. Polyzoa, p. 311, pi. xxiv. fig. 7, 

 7a, 8; Smitt, Floridan Bryozoa, pt. ii. p. 63, pi. xi. figs. 220-223; 

 Waters, Quart. Journ. Geol. Soc. vol. xxxviii. p. 270. 



Gumulipora angulata, Reuss, Septarienthon, p. 63, pi. viii. fig. 12. 



Zoarium dome-shaped, about 30 millim. diameter, composed of many 

 layers of zooecia. The under surfac^e is cupulate, and the zooecia 



