114 Transactions. 



Although this list is short and many species are not identified, it can 

 be asserted that not more thaij two are Kecent species, and even these 

 are doubtful. The new species of Surcula is of considerable interest, for it 

 belongs to the group that contains ;S. hamiltoni, S. gravida, and S. torti- 

 costata, all of which are restricted to the strata that lie beneath the lime- 

 stone near Oamaru. The horizon is probably a little higher than the 

 Hampden series, but also lower than the lower fossiliferous bed in the 

 Trelissick Basin, to which reference has previously been made. 



The hydraulic limestone of the Kaipara Harbour is thus, from a con- 

 sideration of such palaeontological evidence as is available, seen to be of 

 approximately the same age as the Amuri limestone of the Trelissick Basin. 



The following changes and additions must be made to the list of the Hamji- 

 den moUuscan fauna given in Trans. N.Z. Inst., vol. 51, p. 235, 1919 : — 



Siphonalia nodosa Martyn to be Siphonalia nodosa acuticostata (Suter). 

 Volutoderma zelandica Marshall to be Borsonia zelandica (Marshall). 



The list of additions that is given below includes the species mentioned 

 in the footnote on the page cited above : — 



Admete anomala (Marshall and Murdoch) 



Epitonium aff. gracillimum (Sut.) 



Epitonium parvicostatum (Marshall) 



Euthriofusus spinosus (Sut.) 



Fusinus sp. (fragments only) 



Fusinus aff. morgani (Sut.) 



Leptoconus armoricus pseudoarmoricus (Marshall and Murdoch) 



Limopsis aurita (Brocchi) 



Limopsis catenata (Sut.) 



Nucida n. sp. 



Nuculana semiteres (Hutt.) 



Pecten aff. fischeri (Zittel) 



Phos sp. (fragments only) 



Protocardia pulchella (Gray) 



Rissoina ohliquecostata (Marshall and Murdoch) 



Seila attenuissima (Marshall and Murdoch) 



Sinum carinatum (Hutt.) 



Siphonalia senilis (Marshall and Murdoch) 



Soletellina n. sp. 



Surcula hampdenensis (Marshall and Murdoch) 



Trifora aoteaensis (Marshall and Murdoch) 



Turris curialis (Marshall and Murdoch) 



This list raises the total to ninety-three species, of which some thirty- 

 nine have not been found elsewhere. SijjJionalia nodosa is now taken out • 

 of the list, and Protocardia pulchella and Limopsis aurita are added to 

 the number of Recent species, which now number eight, a percentage of 

 only 8'7. Cossman has pointed out that the identification of Limopsis 

 aurita in New Zealand is an error, and that the species should be called 

 L. zelandica Hutton. It is placed here under L. aurita because in other 

 lists of Oamaru strata this identification has been made. 



List of Papers cited. 



Marshall, P., 1919. Fauna of the Hampden Beds and Classification of the Oamaru 



System, Trans. N.Z. Inst., vol. 51, pp. 226-50. 

 Pakk, J., 1918. N.Z. Geol. Surv. Bull. No. 20. 

 Speight, R., 1917. The Stratigraphy of the Tertiary Beds of the Trelissick or Castle 



Hill Basin, Trans. N.Z. Inst, vol. 49, pp. 321-56. 

 Thomson, J. A., 1916. The Flint-beds associated with the Amuri Limestone of 



Marlborough, Trans. N.Z. Inst., voh 48, pp. 48-58. 



