330 Transactions. — Geology. 



*4. Crepidula incurva, Zittel. 



5. Panopaa neozelanica, Quoy. (?) 



6. Mactra cliscors, Gray. (?) 



7. Hemimactra notata, Hutton. (?) 



8. Hemimactra elongata, Quoy. (?) 



9. Lutraria solida, Hutton. 



10. Paphia neozelanica, Chemnitz. 



11. Venus strutchburyi, Gray. 



12. Venus sulcata, Hutton. 



13. Dosinia subrosea, Gray. 

 *14. Cardita australis, Lamarck. 

 *15. Pectuncutus laticostatus, Quoy. 

 *16. Mytilus magellanicus, Lamarck. 



17. Modiola australis, Gray. 

 *18. Pecten triphooki, Zittel. 



19. Pecten accrementus, Hutton. 



20. Pecten chathamensis, Hutton. 



21. Pecten neozelanica, Gray. 

 *22. Pecten burnetii, Zittel. 

 *23. Ostrea nelsoniana, Zittel. 



24. Waldheimia patagonica, Sowb. 

 All these species are found in rocks belonging to the Pareora 

 system in other parts of New Zealand, except Hemimactra notata 

 and Mytilus magellanicus, and the first of these is doubtfully 

 identified from casts only. The following are characteristic 

 Pareora fossils : — Crepidula incurva, Pecten triphooki, Pecten 

 accrementus, Pecten chathamensis, Pecten burnetti, and Waldheimia 

 patagonica. The last species ranges into the Oamaru system, 

 but the other five are confined to the Pareora system. Of the 

 24 species enumerated, no less than 15, or 61 per cent., are 

 recent. But this percentage of species is probably too large, 

 as several of the fossils have been doubtfully referred to living 

 species from casts alone, and they are mostly Lamellibranchintn, 

 which have a longer specific life than Gastropoda. Future 

 research will, no doubt, reduce the proportion of living species. 



Petane Series. 



This series occupies the north-east corner of the island. The 

 unconformity between it and the underlying Scinde Island lime- 

 stone is very apparent on the eastern shore, opposite the Spit. 

 The unconformity is not so clear on the western side, owing to 

 the large accumulations of the overlying brick-earth, or loam. 

 The series consists of the following : — 



2. Shelly limestone, formed by comminuted shells, resting 



on — 

 1. Soft sandstone of a yellow, grey, or brown colour. 



* Abundant. 



