320 C. A. SUSSMILCH AND T. W. E. DAVID. 



part of the lower marine series which underlies the Proto- 

 retepora ampla shales with abundant Strophalosia Clarkei 

 at Allandaie, (a thickness of about 2400 feet of strata) may 

 also be provisionally classed as Uralian, as already suggested 

 (see Plate XXIX, Section 1). 



In regard to the possible Permian age of the Upper 



Marine Series of New South Wales, Mr. W. S. Dun has 



called special attention to the number of giant forms 



present in the fauna of the Upper Marine. These comprise:- 



Archcecidaris Selwyni Eth. fil., measuring, 100 mm., the mouth 



45 mm. in diameter. 

 Monaster giganteus, measuring, span 170 mm., disc 30 mm. 

 Stenopora (flabellate form), imperfect 140 mm. by 130 mm. 



,, crinita (imperfect mass) 170 mm. by 140 mm, 

 Spirifera vespertilio, height 127 mm., breadth 3 mm. 

 Martiniopsis subradiata Sowb., measuring, height 127 mm. by 



180 mm. 

 Aphanaia gigantea (1) measuring 410 mm. in length. 



(2) „ 430 mm. „ 



Aviculopecten ponderosus Eth. fil. and Dun, measuring, height 



175 mm., breadth 160 mm. 

 Deltopecten leniusculus Dana, measuring, height 145 mm , 



breadth 165 mm. 

 Eurydesma cor datum, measuring, breadth 160 mm., height 



125 mm. 

 Cleobis grandis, measuring, breadth 160 mm. height 140 mm. 

 Keeneia, measuring, height 84 mm., diameter of body whorl at 



base 115 mm. 

 Conidaria inornata Dana, measuring, 250 mm. in length (in- 

 complete) by 27 mm. in diameter. 



The abnormal size of these and other forms in Mr. Dun's 

 opinion, heralds their approaching extinction. This extinc- 

 tion Mr. Dun thinks, belongs not so much to the epoch of 

 the passage of Carboniferous into Permian forms, as to 

 that which presaged the ending of Palaeozoic and the begin- 



