23art 3] the trias of new Zealand. 193 



Garden Gully, contains only JPseudomonotis richmondiana. Near 

 Albatross Point, in the Kawhia district, the dark shales underlying 

 the llhsetic Series, close to an igneous intrusion, contain the large 

 fiat Ps. ochotica var. densisfrictta and a form approaching var. 

 pacliy pleura, while Ps. riclimondiana seems to be absent, a fact 

 which further goes to indicate the higher position of the Ps.-ochotica 

 horizon. I have seen no Ps. ochotica from the Hokonui Hills, 

 but Ps. richmondiana occurs at various places in that district. 

 Okuku is the only locality in New Zealand where the ]\Ionotis-Vike 

 shells form a limestone. Though it seemed unlikely to me that 

 the Alpine Monotis salinaria should occur in New Zealand, yet 

 it is not an impossible contingency. Wanner,^ who paid great 

 attention to the differences between this shell and the large flat 

 forms of Ps. ochotica, records its occurrence in the island of 

 Serang. 



I have already stated, in discussing the Okuku locality, that 1 

 am compelled to regard the shell which occurs there as belonging 

 to the Alpine form 3Ionotis salinaria. 



PsEUDOMOJ^^OTis OCHOTICA Teller. (PI. XIX, figs. 1-8.) 



1886. E. von Mojsisovics, 'Avktisclie Tiiasfaunen ' p. 116 & pi. xvii, figs. 1-15, 



pi. xviii, figs. 1-il. 

 1907. J. Wanner, ' Triaspetretakten der Molukken ' p. 189 & pi. viii, fig. 9. 



This is a very variable species, and Mojsisovics and Teller have 

 carefully described and illustrated from the original locality at 

 Yerkhoyansk in Arctic Siberia five varieties, in addition to the 

 form which they regard as the normal type. These they have 

 called vars. densistriata, eiirhachis, amhigua, i?acliy pleura, and 

 sparsicostata. 



In the one bed at Garden Gully, near the Wairoa Gorge, I 

 collected specimens more or less closely comparable with all these 

 varieties, and, in addition, a form still more strongly arched and 

 ribbed than any that are recorded from the original localit}^, 

 which I have ventured to institute as a new variety under the name 

 acutecostata. All the varieties occur indiscriminately mingled 

 together in one and the same rock. 



It is not necessary here to recapitulate the description of the 

 different varieties as given b}" Teller; but I may say that the large 

 flat Salinaria -like variety densistriata (fig. 1) occurs in very 

 characteristic form, and that some of the specimens approach the 

 North American form Pseudonwnotis snhcircularis in the expan- 

 sion and rounded outline of the anterior margin. 



The posteriorly elongate and expanded, coarsely-ribbed variety 

 'pachypleura (fig. 3) occurs together with a form presenting a 

 more or less quadrilateral margin, which Teller calls var. eurliacliis 

 (fig. 5). The variety sparsicostata, approaching in character the 

 large and nodosely- ribbed form of Ps. richmondiana, which 



1 Bibliography, 49, p. 190. 



