Marshall. — Fossil Moa-bones in Lower Wanganui Sfrafa. 253 



It is interesting to have definite evidence that the large species of 

 Dinornis existed when so many extinct species and genera of Molhisca were 

 still living in New Zealand waters. 



It is perhaps worth noting that Lutraria solida has not yet been found 

 in any beds on the coast-line higher than that containing the moa-bones. 

 Of other well-known extinct species of MoUusca the following information 

 has now been gained so far as occurrence in the strata on the coast-line is 

 concerned : Melina zelandica, Struthiolaria frazeri, and Crepidula gregaria 

 first occur in the bed that has been mentioned 40 ft. below the moa-bed, 

 and Cardium spatiosum and Ostrea ingens are first fomid at "Wilkie's Bluff, 

 close to the south of the Waitotara mouth. Ghjajmeris subglobosa first 

 ccurs two miles north of the Waitotara. At Mokoia, close to Hawera, 

 shell of Dosinia magna was obtained. 



From the collections that have been made at present it seems that 

 about 90 per cent, of the Mollusca in the Castlecliff beds are of Recent 

 occurrence. In the moa-bed there are about 80 per cent, of Recent species. 

 At the Waipipi Beach, five miles north of the Waitotara mouth, the 

 percentage falls perhaps as low as 65. 



I hope to publish a fuller statement of this matter, with lists of the 

 species, next year. 



Art. XXV. — Some New Fossil Species of Mollusca. 



By P. Marshall, M.A., D.Sc, F.G.vS., and R. Murdoch. 



[Read before the Wanganui Philosophical Society, 20th December, 1918 ; received by 

 Editor, 31st December, 1918 ; issued separately, 16th July, 1919.] 



Plates XIX-XXI. 



The species of fossil Mollusca which are described in the following pages 

 have been collected from Tertiary beds in several dift'erent localities. Some 

 of the specimens were submitted to the late Mr. Suter, but he had no time 

 to describe them. 



The following species were found at Wharekuri, on the Waitaki River, 

 a few miles above Kurow : Fusinus maoriuni., Leucosyrinx subaltus, and 

 Crassatellifes siihobesus. The material from which they were taken is 

 argillaceous greensand, which in this locality rests upon quartz sands, 

 which contain coal-seams. Altogether seventy-five species of Mollusca 

 have been found in these beds, and 24 per cent, of these are Recent 

 species. We regard this bed as a stratigraphical series in the Oamaru 

 system, lying below the Ototara limestone. 



Ficus imperfectus was found at Target Gully, as well as Venericardia 

 hollonsi Suter and Drillia laevis (Hutton), two species which have not 

 previously been recorded from that locality. These species raise the total 

 number collected at Target Gully to 223. " Some 34 per cent, of these are 

 Recent. The horizon is 40 ft. above that of the Ototara stone. It has 

 been placed by Marshall in the Awamoa series of the Oamaru system. 



Lima waipipiensis was found at the Waipipi Beach, five miles from 

 Waverley. The horizon is probably some 1, 500-2, 500 ft. below the highest 



