ALDINGA AND THE EIVER-MURRAY CLIFFS, SOUTH AUSTRALIA. 295 



Log. Living : various Australian localities. Fossil : Muddy 

 Creek. 



28. MicROPORELLA coscixopoRA, Rcuss, var. MucROJfATA, MacGr. 



Lepralia mucronata, MacGillivray, Tr. E.oy. Soc. Yict. 1868. 



Eschara mucronata, MacG., Nat. Hist. Vict. dec. v. p. 43, pi. xlviii. 

 figs. 6, 7. 



Microporella co5ciuopora,Reuss,var. armata, Waters, Quart. Journ. 

 Geol. Soc. vol. xxxvii. p. 331, pi. xv. fig. 25. 



Loc. Living : QueenselifF and Schnapper Point (MacG.), Port- 

 Philip Heads (A. W. W.). Fossil : Curdles Creek, Muddy Creek, 

 Ptiver-Murray Cliffs. 



29. Microporella yiolacea, Johnst., var. fissa, H. 



Microporella Jlssa, Hincks, Ann. & Mag. iS^at, Hist. ser. 5, vol. vi. 

 p. 381, pi. xvii. fig. 4. 



30. Microporella symmetrica, Waters, Quart. Journ. Geol. Soc, 

 vol. xxxvii. p. 332^ pi. xviii. fig. 83. 



31. Microporella ferrea, Waters, loc. cit. p. 330, pi. xvii. fig. 72. 



32. Microporella pocillieormis, sp. nov. (PI. Yll. fig. 8.) 



Zoarium dome-shaped, 7 mm. diameter, in growth resembling 

 Cupularia. Zooecia suboval, convex, surface covered with large 

 pores, with a raised suboral pore just below the oral aperture. 

 Oral aperture rounded at the distal end, straight below, 0-24 mm. 

 broad. There are two distal rosette-plates, each of which usually 

 has two openings. On the under surface of the colony the area of 

 each zooecium is distinctly marked and is convex. 



Loc^ Eiver-Murray Cliffs. 



33. Microporella ma&na, T.-Woods. (PI. YII. fig. 7.) 



Lunulites magna, T.-Woods, Trans. Phil. Soc. Adelaide, 1880, p. 7, 

 pL i. fig. 6a-Qd. 



Zoarium large (25 mm. diam.), dome-shaped, consisting, in the 

 specimen examined, of one layer of zooecia, slightly elevated along 

 eight lines radiating from the centre ; Mr. Woods says, " In the 

 younger specimens .... irregularly pentagonal; in the older 

 specimens .... irregularly lobed or sinuated." 



On each side of these lines the direction of the avicularia is 

 opposed, being directed diagonally upwards to the right on one side 

 and diagonally upwards to the left on the other side. 



Zooecia raised, especially near the aperture, with large pores over 

 the surface and a large suboral pore below the aperture. Oral 

 aperture large (0*23 mm. wide), straight on the proximal edge with 

 the corners rounded ; the distal edge of the aperture forms half a 

 circle. The true shape of the aperture is sometimes obscured in 

 the older cells. Avicularia large, broad ; aperture pointed above, 

 rounded below, I have not had the opportunity of examining the 



y2 



