208 REMARKS ON FOSSILS OP PERMO-CARBONIFEROUS AGE, 



preserved, and adds nothing to that already known. The 

 tubes and superimposed layers are visible, but the dividing 

 lamina separating the two halves of the ray is not so. 



The occurrence of Evactinopora is interesting as furnishing a 

 fossil in common between the Mount Marmion and Gascoyne 

 beds. 



BRACHIOPODA. 



Geuus SPIRIFERA, /. Soicerhy. 



05s.— Two species of this genus are present in the Mount 

 Marmion gatherings. The first is represented by fragments only, 

 clearly those of a very large species, evenly and finely costate. 

 One of the pieces is three and a quarter inches in depth from the 

 hinge towards the front. Of the second species only one specimen is 

 present, and although differing from the typical figures ^ must, I 

 think, be referred to iS2)irifera tasmaniensis. It is a ventral valve, 

 bearing six principal radiating costse, three on each side the sinus. 

 These, as well as the valleys between them, are traversed by fine 

 and much smaller subsidiary ribs, and there are traces of trans- 

 verse or concentric laminae. The sinus, which is wide and open, 

 likewise bears similar riblets. The general form of the shell is 

 transversely oval. 



Genus ATHYRIS, McCoy. 



Athyris Macleayana, sjy.nov. 



Sp. char. — Shell circular, or transversely oval in outline, but 

 usually the former, plano-convex, or at times slightly concavo- 

 convex ; the dorsal valve always convex, the ventral valve flat or 

 slightly concave ; the lateral margins are in the same plane with 

 the hinge line, but the front is to some extent sinuated. Ventral 

 valve flat as a rule, and very shallow, with an inconspicuous 

 horizontal and semi-truncate umbo, but in no degree overhanging 

 the hinge line ; foramen small, circular, opening upwards, but 



* Strzelecki's Phys. Descrip. N.S. Wales, &c., 1845, t. xv. 



