BRY0Z0A FROM S.W. VICTORIA, AUSTRALIA. 



This is a very interesting specimen, as the shield-like elevation 

 gives it a peculiar appearance different from any thing with which we 

 are acquainted ; and at first I did not know in what way the struc- 

 ture must be interpreted, and examined to see if it could be an ovi- 

 cell, but think it must be considered homologous with the tubular 

 pore of P. tubulosa. The specimens are all small. 



Loc. Fossil: Mount Gambier (Etli.,jun., coll.). 



40. Porina coronata, Ess. Plate XV. fig. 57. 



CelJaria coronata, Rss. Foss. Polyp, des Wien. Tert. p. 62, pi. viii. 

 fig. 3. 



Eschara conferta, Rss. loc. cit. p. 71, pi. viii. fig. 32. 



Acropora coronata, Rss. Foss. Anth. & Bry. d. S. von Crosaro ; 

 Denk. math.-nat. Cl. k. Akad. der Wissensch. Wien, vol. xxix. 1868, 

 p. 65, pi. xxxiv. figs. 33-55. 



Spiroporina vertebralis, Stoliczka, Foss. Bry. Orak. p. 106, pi. 

 xvii. figs. 6, 7. 



Spiroporina vertebralis, T. "Woods, " Corals & Bryozoa of Neozoic 

 Period in New Zealand," Pal. of New Zeal. pt. iv. Colon. Mus. & 

 Geol. Survey Dept. 1880, p. 23. 



Porina DieffenbacMana, Stoliczka, loc. cit. p. 135, pi. xix. fig. 20. 



Porincc DieffenbacMana, T. Woods, " C. & Bry. of Neoz." loc. cit. 

 p. 25. 



Eschara Busfcii, T. Woods, " On some Tert. Austr. Polyz.," Tr. 

 R. Soc. N. S. Wales, 1876, p. *f 9 , figs. xvi. & xvii. 



Myriozoum australiense, Haswell, "On some Polyzoa from the 

 Queenland Coast," Proc. Linn. Soc. N. S. Wales, vol. v. pt. 1, 1880, 

 p. 43, pi. iii. figs. 9-11. 



This species has caused me much trouble, as its appearance in 

 various conditions is very different ; but direct comparison of typical 

 specimens with Acropora coronata from Val di Lonte showed that 

 the size, form of the cell, peristome, median pore, and small pore 

 were sometimes just the same. 



The zoarium is sometimes round and very slender, as in fig. 57; in 

 others round and stout, as in Stoliczka's figure of S. vertebralis ; but 

 having a complete intermediate series, there is no doubt that they 

 must be united. In other specimens, especially those from Mount 

 Gambier, the branches are flattened as in P. Dieffenbachiana, 

 Stol., fig. 20. The surface sometimes has small elongate pores, 

 in other cases larger and round ones. In the slender specimens the 

 pores are finer and more elongate, while in the stoutest they corre- 

 spond with the pores of the Italian P. coronata. Again, the 

 peristome in young cells is very thin and projects considerably; 

 while in older specimens the large pores in the walls of the peri- 

 stome are more distinctly seen ; and in very well preserved speci- 

 mens the walls of these project, so that each peristomial pore may 

 be said to have itself a peristome. The median pore is usually about 

 one quarter of the length of the zocecium from the oral aperture, but 

 sometimes much nearer ; and in old cells, where the peristomial wall 

 is much thickened, it approaches very close to the peristome, and 



