296 A. W. VTATEES ON CHILOSTOMATOXTS BEYOZOA FEOM 



under surface of the zoarium ; but Mr. Woods says, " Under surface 

 finely radiately ridged, with a narrow slit-like pore at the margin." 

 Log. Mr. T.-Woods gives Aldinga and Mt. Gambier. 



34. MicsopoEELLA (Dipoetjla) ma&nteosteis, MacG. 



Microporella introversa.'W SiteTs, Quart. Journ.Geol. Soe.vol.xxxviii. 

 p. 268, pi. ix. figs. 33, 34. 



Lepralia magnirostris, MacGillivray, " New or Little-known 

 Polyzoa," pt. 2, Trans. Eoy. Soc. of Victoria, vol. xix. p. 134, fig. 6. 



Specimens from tbe Eiver-Murray Cliff's grow either in the Hem- 

 escharan form when the dorsal surface is coarsely granulated and 

 has large pores, or in superposed layers with zooecia of the same size 

 as those from Mt. Gambier, but in a better state of preservation; and 

 here the central pore is very distinct and raised, but with a cleft in 

 the upper (distal) part of the raised tube surrounding the pore. 

 This better-preserved material shows that I was misled in supposing 

 that the avicularia were directed inwards ; I then attributed the 

 avicularia to the wrong zooecia. 



Loc. Fossil : Mt. Gambier ; Kiver-Murray Cliff's. Living : Port- 

 Philip Heads. 



[Since this paper was read, Miss Jelly has sent me a recent specimen 

 from Port-Philip Heads (Australia). This is in tbe Hemeschara- 

 form, but the dorsal surface was perhaps attached to a sponge, as it 

 is studded with large erect pore-tubes resembling those on the dorsal 

 surface of Selenaria macidata, and besides these there are calcareous 

 off'sets, which are traversed by numerous tubes, and appear to have a 

 sponge-like structure. I hope to make a further examination and 

 sections of these interesting radicles.] 



This and the last species are very closely allied and should per- 

 haps be united under one name. In both the recent specimen and 

 the one from the Eiver-Murray Cliff's the peristome is more raised 

 than in the one I figured. 



35. MicEOPOEELLA ELEVATA, T.-Woods. (PL YII. figs. 6 and 9.) 

 Eschara elevata,T. -'Woods, Trans. E. Soc.N.S.W. 1876, p. 2, fig. 10. 

 Microporella elevata, Waters, Quart. Journ. Geol. Soc. vol. xxxvii. 



p. 330, pi. xvii. figs. 63, 64, pi. xviii. fig. 90. 



When describing the fossil from Curdles Creek I pointed out the 

 great difference in zooecia from different parts of the same colony, 

 and some weU-preserved specimens from the Eiver-Murray Cliffs, 

 showing in places the structure given in fig. 63 (loc. cit.), have in 

 other parts a much more regular and elaborate structure. The peristo- 

 mial region is raised and surrounded by a ridge, with small pores 

 within the area thus formed ; down the middle of each zooecium 

 there is a straight ridge which expands at the lower part of the 

 zooecium, surrounding the median pore. On each side of this line 

 there are large irregular openings. 



There are very curious zocecial avicularia occurring only near the 

 border of the colony with a nearly round aperture divided by a cross 

 bar near the lower edge. 



