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



If now an analysis of the Irwin River Permo-Carbonifer- 

 ous fossils be attempted we find that out of 108 species 

 recorded from the Irwin River 



5 are Foraminifera 7 Gastropods 



9 are Corals 6 Oephalopods 



1 is Orinoid (6 gen. recorded) 1 Crustacean 



2 are Serpulse 1 Fish 

 11 Polyzoa 



48 Brachiopods 108 

 17 Pel ecy pods 



Of these species there are some eighteen which are 

 found in extra-Australian areas, and of these nine occur in 

 the Productus Limestones of the Salt Range, or in the 

 Zewan (Permian) beds of Kashmir. Three are common to 

 the Productus limestone and the Artinsk formations, and 

 may therefore be Permian to infra-Permian. One ranges 

 from Ural to Artinsk (Infra-Permian) to Upper Carbonifer- 

 ous, one is Uralian, one is Visean to Upper Carboniferous, 

 while of the two cosmopolitan forms Productus corn and 

 Productus semireticulatus, the former ranges from Lower 

 Carboniferous to the top of the Permian, and the latter 

 certainly ranges through the whole of the Carboniferous. 



On the whole therefore specifically the Irwin River fauna 

 both above and in association with the glacial beds is a 

 "Productus limestone" fauna but for the five species Pro- 

 ductus semireticulatus, P. tenuistriatus, Seminula sub- 

 tUita, 1 Syringothyris exsuperans (?), Baylea (Ivania) 

 Levellei (?). It may be added that it is doubtful whether 

 the two preceding species have been correctly determined. 

 On the other hand if one now compares this Irwin River 

 fauna with that of the Burindi Beds (Middle Lower Car- 

 boniferous or Visean) of East Australia, one finds no less 



1 Mr. R. Etheridge Juar. is careful not to call these forms Syriugo- 

 thvris, but Syringotbyris-like-spiriferse, Geol. Surv. West Australia, 

 Bull. No. 58, Pt. VI. 



