286 DE. L. F. SPATH ON [vol. lxxix, 



Locality. — Slopes of Flag Hill, Hokonui Hills. Callovian (?). 



Remarks. — This brachiopod is evidently a degenerate survivor 

 of one of the Spiriferids of the Trias. Old-age features are 

 apparent in its covering of spines, and we may note the fact that 

 the arrangement of dental plates and median septum is of the 

 Cyrtiniform character that is apparent in so many of the Spiri- 

 ferinse of the Alpine Bhsetic, and of the New Zealand Trias. I 

 have discussed this question in a paper dealing with the Triassic 

 brachiopoda. 1 



Since the nature of the shell-structure and of the spiralia and 

 the dorsal valve is unknown, it is perhaps of little use to enquire 

 further to which of the Triassic forms it may be referred. No 

 Spiriferina of the Trias that I know of bears spines. It may be 

 related to the spiny shell, JHfentzeliopsis, which is a spinous 

 development of Mentzelia ; in that form, however, the hinge- 

 jilates do not join the median septum, but lie alongside of it. 



Till. Appendix. — On Ammonites from New Zealand. 

 By Leonard Frank Spath, D.Sc, F.O.S. 



Contents. 



Page 



(1) Introduction 286 



(2) Specific Descriptions 287 



(A) Lower Lias. 



(B) Middle Lias. 



(C) Upper Jurassic. 



(3) Conclusions 300 



(4) Note on the Upper Limit of the Jurassic 303 



(5) Summary of New Names 308 



(1) Introduction. 



Dr. Trechmann, who had been favoured with identifications 

 from Mr. S. S. Buckman, at first had the intention of dealing in 

 the foregoing paper with some of the ammonites that he had 

 collected in New Zealand ; but, at his request, I have undertaken, 

 in this appendix, a description of a larger series of ammonites, 

 incorporating therewith observations on certain New Zealand 

 specimens long since acquired by the British Museum (Natural 

 History) and others sent recently by Prof. P. Marshall and the 

 Geological Survey of New Zealand. The examples originally for- 

 warded by Dr. Trechmann included five belonging to the genus 

 Psiloceras, of the Lower Lias, and five ammonites from the 

 Upper Jurassic, representing the genera Phi/lloceras, Lhligites, 

 and ' Aulacospliinctes\ In addition there were an unidentifiable 

 fragment of probably an Upper Jurassic ammonite, from Kohai 

 Point, and several Senonian forms, already briefly mentioned 



1 ' The Trias of New Zealand' Q. J. G-. S. vol. lxxiii (1917-18) p. 215. 



