from New Zealand. 299 



I am inclined to think the New Zealand shell is identical with 

 T. Hanetiana, but owing to the poor condition of the only specimen 

 I collected I cannot be quite certain. 



Wilckens 1 describes another foi-m, T. ecplecta, from the Upper 

 Cretaceous of Baguales in South Patagonia, which, though larger, is 

 certainly related to T. Hanetiana, but on which the cross ribs are 

 confined to the upper anterior portion of the shell, and the concentric 

 furrows are much stronger. 



T. Hanetiana belongs to the commonest fossils of the Chilian 

 Upper Cretaceous, and together with Cardium acuticostatum , d'Orb., 

 is regarded as a leading fossil of the Quiriquina Beds. 



I found no Trigonias at Selwyn Kapids, but I believe they occur 

 there. 



Dentaliuh sp. (PI. XXI, Pig. 10. X 2 nat. size.) 



Shell slightly curved, increasing slowly in size, rather thin,' and 

 almost circular in section. The surface is rather rough, and the 

 growth-lines are well marked. A specimen I collected resembles 

 D. Chilensis, d'Orb., which is common at Quiriquina, but is without 

 the longitudinal stria? that occur on the thin end of that species. 

 It is comparable also with D. Cazadorianum, Wilckens, from South 

 Patagonia. 



Locality. — Selwyn Rapids. - Dentaliums of fairly large size are 

 common, generally as casts in some parts of the rock. 



Tttekitella. sp. (PI. XIX, Pig. 11. X2f nat. size.) 

 Shell small, consisting of seven whorls, which increase very 

 gradually. The test is rather thin, the sutures are shallow, and 

 each whorl is decorated with seven or eight very faint spiral raised 

 ridges. 



Locality. — Selwyn Bapids. 



Chkysostoma. Selwynensis, sp. nov. (PL XXI, Pigs. 4a, h.) 

 Shell very small, thick, and globose, consisting of five whorls. 

 Surface smooth and rounded, sutures shallow. There is a faint 

 umbilicus which is mere or less covered by a reflected callus extension 

 of the inner lip. The outer lip, though broken, seems to have been 

 sharp. Height 5 mm. I can find no described form in the Indo- 

 Pacific Cretaceous resembling this small and insignificant-looking 

 shell, and so am constrained to give it a new specific name. The 

 only living representative of the genus to which it certainly seems 

 to belong is a beautiful shell, C. paradoxum, Born, found on the 

 shores of New Caledonia. 



Locality. — Selwyn Bapids, one specimen. 



Natica. (Euspira) variabilis, Moore. (PL XIX, Pigs. 8-10.) 



Charles Moore, Quart. Journ. Geol. Soc, vol. xxvi, p. 256, pi. x, fig. 15, 1870. 

 Jack & Etheridge, Geol. and Pal. Queensland, 1892, p. 485, pi. xxxi, figs. 2, 3. 

 B. B. Newton, Proc. Malac. Soc, vol. xi, pt. iv, p. 232, pi. vi, figs. 21-3, 1915. 



The New Zealand form of this Australian fossil is rather variable. 

 One specimen (Fig. 8) has four volutions, is broader than it is high, 



1 Berichte der Naturf. Gesell. z. Freiburg, Bd. xv, p. 37, pi. vii, figs. 2, 3, 

 1907. 



