332 Proceedings of the Royal Society of Victoria. 



outer borders of the two valves, brought into approximation by 

 pressure. The plates of this aptychus are rather thin, a usual 

 character in those known to occur in the Perisphinctidae. In this 

 example the aptychus has almost entirely lost the outer granular 

 layer — all but one small patch lying near to the fractured shell 

 of the ammonite. That which is probably the outer surface of 

 the intermediate layer of the aptychus is smooth, sparsely and 

 finely punctate, and the surface is travei'sed by curved, distant, 

 slightly depressed folds or imbrications (in places). The granu- 

 late condition of the outer layer corresponds with Zittel's group, 

 the Grauulosi, to which the Perisphinctidae seem to belong. 



Locality and Horizon. — Greenough River District, Western 

 Australia. Jurassic. [2069.] 



Species Recorded in the Foregoing Paper. 

 The asterisk denotes its occiirrence for the first time from that locality. 



Lepidodendron australe, McCoy. Carboniferous ; Drummond 



Range, Q. 

 *Phyllotheca australis, Brongn. Carbo-permian ; Baron R., Q. 

 *Archaeocalamites scrobiculatus (Schlotli). Carbo-permian ; 



Baron R., Q. 

 *Glossopteris browniana, Brongn. Carbo-permian ; Baron R., Q. 

 *Glo.ssopteris auipla, Dana. Carbo-permian ; Baron R., Q. 

 ■*Glossopteris parallela, Feistmaiitel. Carbo-permian; Baron 



R., Q. 

 *Araucarioxylon daintreei, sp. nov. Carbo-permian ; Baron R., Q. 

 *Stenopora leichhardti, Nich. and Eth., Fil. Carbo-permian - 



Irwin R. District, W.A. 

 Crinoid stems. Carbo-permian; Irwin R. District, W.A. 

 *Derbyia {cf.) senilis (Phillips). Carbo-permian ; Irwin R. 



District, W.A. 

 *Strophalosia (.-larkei (Etheridge). Carbo-permian ; Irwin R. 



District, W.A. 

 Productus undatus, Def ranee. Carbo-permian ; Irwin R. District, 



W.A, 

 Productus cora, d'Orbigny. Carbo-permian; (?) Bowen R. Coal 



FieUl, Q. 



