104 



Transactions. 



Above the volcanic material come grey and white silts with impure 

 lignite bands, all apparently of fluviatile origin, for they show good current- 

 bedding in places. There is a depth of 30 ft. of these silts, which are then 

 succeeded by an equal thickness of consolidated iron-stained sands, pro- 

 bably of dune origin ; and again above these there is a most interesting bed, 

 10 ft. to 20 ft. in depth, of pumice silts, also evidently of fluviatile origin. 



A succession of dune-sands, rising to approximately 350 ft. above sea- 

 level, and deeply stained and cemented by concretionary limonite, 

 completes the section. 



All these beds above the fossiliferous sands are undoubtedly Noto- 

 pleistocenef in age, and, though of considerable interest, are beyond the 

 scope of this paper, which is chiefly concerned with the fossiliferous sands. J 



List of Mollusca from the Fossiliferous Sands. 



The Mollusca listed below come from near the base of the fossiliferous 

 sands, and within a few feet, therefore, of the unconformity duly noted 

 in the Kawa section. The identifications in nearly all cases were made or 

 checked by the late Mr. H. Suter. For convenience of reference the genera 

 are arranged in alphabetical order in the list. Recent species are preceded 

 by an asterisk. 



Ancilla hehera (Hutt.). 



* novae-zelandiae (Sow.). 



*Anomia cf. huttoni Sut. 

 *Arca novae-zelandiae Smith. 



— — subvelata Sut. 

 *Barnea similis (Gray). 

 *Calyptraea maculata (Q. & G.). 

 *Cardiia calyculata (L.). 

 *Chione mesodesyna (Q. & G.). 



meridional'is (Sow.). 



* spissa (Desh.). 



Cir cuius cingulatus Bartrum.§ 

 Crepidula gregaria Sow. 

 * monoxyla (Less.). 



striata (Hutt.). 



*Dentalium ? huttoni T. W. Kirk.|| 



jiareorense Pilsbry and Sharp. 



solidum Hutt. 



*Diplodo7ita zelandica (Gray). 

 *Divaricella cumingi (Ad. & Ang.). 

 *Dosinia anus (Phil.). 



* caerulea (Reeve). 



* magna Hutt. 



Drillia aequistriata Hutt. 



* laevis (Hutt.). 



*Emarginula striatula Q. & G. 



Fulgoraria sp. 



Glycymeris globosa (Hutt.). 



* striatularis (Lamk.). 



*Gomp]iina maorum Smith. ^ 

 *Hipponix antiquatus (L.).** 

 *Leda bellula A. Ad. 



Lima color ata Hutt. 

 *Loripes concinna Hutt. 

 *Mactra discors Gray. 

 * scalpellum Reeve. 



Marginella ? harrisi Cossm. 



* pygmaea Sow. 



*Murex zelandicus Q. & G. 

 *Myodora antipodum Smith. 

 *Natica australis (Hutt.). 



* zelandica Q. & G. 



*Nucula hartvigiana Pfr. 

 * nitidula A. Ad. 



Olivella neozelanica (Hutt.). 



Ostrea, several sp. 



t J. A. Thomson, loc. cit. 



X It is perhaps permissible to point out that the pumice silts oiTer strong evidence 

 that the Waikato or some such river flowed westward to this portion of the coast in 

 early Notopleistocene times, bringing the pumice from the central rhyolitic country. 

 Pumice terraces of corresponding height above sea-level are described by Henderson 

 on the banks of the Waikato River near Cambridge (J. Henderson, N.Z. Journ. 

 Sci. <& Tech., vol. 1, pp. 112-15, 1918). 



§ Described in this volume (p. 97). 



II Two specimens, small, incomplete at anterior end, come near D. huttoni, but 

 ornamentation shows more numerous longitudinal ribs than in the type 



^ Not before recorded fossil. 



** New to fauna. 



