part 3] THE TEIAS OF NEW ZEALAND. 213 



where it is common and very well preserved. It also occurs at 

 Nugget Point and in the Nelson district. Carnic. 



lie marks. — This large form recalls somewhat the Permian 

 Pleurophorus costatns, but is larger, more rounded, and the 

 hinge-line is more arched. 



Anisocardta PAiiTULA, sp. nov. (PI. XXII, figs. 6 & 7.) 



Shell thick, sub-circular, with rounded margins. Beak slightly 

 in front of the median line, not very prominent, but there is a 

 well-marked lunule in front of it. Five or six irregularl}^ spaced 

 growth-furrows occur, and about seventeen faint, slightly-arched 

 ribs pass from the beak to the margin. The ribs are wanting on 

 the hinder part, and become very faint on the front part, of the 

 shell. A squeeze of the interior of a right valve shows a strong 

 •cardinal tooth and apparently another tooth in front of this one, 

 and sockets about equally distant from the beak for an anterior 

 .and a posterior tooth. These sockets occur just above the muscle- 

 «cars ; the anteiior scar is deep and bounded by a ridge, the posterior 

 ,scar is less strongly marked. The lower interior mai'gin of the 

 valve is crenulated. Leno-th ^:i5'o mm. ; heio-ht = 5 mm. 



This little shell seems to belong to the Cypricardiacea^, and, with 

 PalcGocardita and PleurojjJwrus, forms the third representative of 

 that group in the New Zealand Trias. 



Localit}^ and horizon. — Bed c, Otamita, Hokonui Hills. 

 I also saw traces of it in the Kalohia-zitteli Beds at Mount 

 Heslington, near Nelson. It is a scarce form. 



BRACHIOPODA. 



The Brachiopoda of the New Zealand Trias a-ffiord an interesting 

 and suggestive study. The Hh^mchonellids seem all to belong to 

 the essentially Upper Triassic group Halorella of Bittner, Avhich 

 Jiave a more or less pronounced median sulcus in both valves. 

 One s^Decies, apparently new, is very common in the Kaihiku Beds, 

 but becomes much scarcer in the Lower Carnic. I have de- 

 scribed onl}^ two forms of Halorella, but probabl}^ more of them 

 occur. Among the Terebratulids the Paleozoic genus Bielasma 

 •occurs, apparently to the exclusion of all others, in the Kaihiku 

 Beds, and seems to be represented by two species. It persists 

 into the Carnic, but becomes much less conspicuous there. In 

 the Carnic beds the Terebratulids of Mesozoic aspect, devoid of 

 hinge-plate and median dorsal septum, become consj^icuous.^ There 

 .are several species, one ol: which is much thickened in the umbonal 

 region and bears very thick hinge-teeth. Others seem to belong 

 to more normal Mesozoic types ; but, as the nature of the brachidia 

 ■could not easily be seen, it is impossible to make an}^ certain 

 generic determination of them. 



1 W. Waagen mentions that, in the Upper Triassic Koessen Beds of India, 

 Dielasma is replaced by the genera Rlixtina and Zugmayeria. 

 Q. J. G. S. No. 291. s 



