102 Proceedings of tlie Royal Society of Victoria. 



are distinctly corrugated on both their dorsal and ventral aspects,, 

 ridges corresponding in position to the radial riblets, and where 

 the frills have become broad strong ridges, they show a corruga- 

 tion on their upper flat surface as well. 



Inner margin tinely denticulated, in some well-preserved 

 examples the denticles commence under the umbo and extend ta 

 the top of the posterior angulation. 



Di/nensions. — Antero-posterior diameter, 68 mm. ; umbo-ventral 

 diameter, 53 mm. 



Locality. — Grange Burn, below Foi'syth's, Western Victoria 

 (T. S. Hall and G. B. P.). Kalimnan,— Miocene. 



Observatio7is. — This species is another of similar type to the 

 foregoing but may be distinguished by its greater inflation, 

 relative dimensions, and detailed characters of surface ornament.. 



EXPLANATION OF PLATES. 



Platic XII. 



Fig. 1. — Chione etheridgei, sp. nov. 



,, 2. — Cardita excresceiis, sp. nov., internal aspect. 



,, 3. — Cardita excrescens, sp. nov., external aspect. 



,, 4. — Mytilicardia kalimnae, sp. nov., slightly reduced. 



,, 5. — Chione cognata, sp. nov. 



Plate XIII. 



Fig. 1. — ^Crassatellites kingicoloides, sp. nov., external aspect.. 

 ,, '2. — Crassatellites kingicoloides, sp. nov., anterior aspect, 

 ,, 3. — Crassatellites kingicoloides, sp. nov., dorsal aspect. 



Plate XIV. 



Fig. 1. — Mytilus mooraboolensis, sp. nov. 

 2. — Crassatellites maudensis, sp. nov. 

 3. — Crassatellites maudensi-s, sp. nov. 

 4. — Lithophagus latecaudatus, sp. nov. 

 5. — Crassatellites camurus, sp. nov., left valve, adult. 

 6. — Crassatellites camurus, sp. nov., right valve, adult. 

 7. — Crassatellites camurus, sp. nov., left valve, young, 

 showing umbonal characters. 



