214 . DE. C. T. TKECIIMAXX OX [yoI. Ixxiii,. 



Xo true Spirifers occur in the Xew Zealand Trias : the spire- 

 bearing forms are all referable to the genera Spiriferina, Cyrtina, 

 JMenfzeUa, llentzeJ/ojJsis, gen. nov., Heizia, Sjjirigera, and 

 Sectoria, gen. nov. iipiriferina begins in the Kaihikn Beds with 

 a small form belonging to the group of >S^^. frag His Schlotheim, 

 which occurs in the German, Alpine, and Himalayan Muschelkalk. 

 Both Sp.frac/dis and a large and rather alate form are confined to 

 these beds. In the Carnic a series of conspicuous sharply-alate 

 forms occur, but in the Bhsetic beds an extremely long- winged form, 

 Sp. diomedea, sp. nov., occurs in association with the Spirigerid 

 genus Hectoria. Bittner expressed his surprise on finding in the 

 Himala^^an Trias a ^piriferina so alate as ^p. sfraclieyi Salter, 

 which he compares in thi.< respect with the Permian Spirifer 

 alafus. The Xew Zealand Trias is characterized by some very 

 much more sharplv-alate forms, which rejn-esent a morphic equi- 

 valent of the long-winged Spirifers of the Palaeozoic. Some, 

 however, are more acutely winged than even the most alate of the 

 true Spirifers. 



Various ^piriferince occur, in wdiicii the ventral septum and the 

 dental plate assume the Cvrtiniforin arrangement. These include 

 the Fsioidea group of Hector, and some of them resemble certain 

 forms of the Alpine Ehsetic. 



A Sefzia of the group of -B. scliwageri Bittner, a rather wide- 

 spread form in the Alps and Himalayas, occurs in the Carnic. 

 Other jRefzicB also seem to be present, but my specimens are not 

 well enough preserved for description. Mentzelia is intermediate 

 in some ways between JSlartinia and Spiriferina. The shell is 

 silky and fibrous, and at the same time faintly punctate ; a sharp 

 median septum and dental plates are found in the ventral valve. 

 I collected two species of Jilenfzelia high up in the Phsetic at 

 Kawhia : one with a smooth J\Ia7^finia-\\\ve shell, and the other' 

 faintly ribbed. They should be searched for at lower horizons and 

 in other localities in New Zealand. 



One of the commonest brachiopods in the Kaihiku Beds is a 

 MentzeJia-Y\\e form having both valves covered Avith tubular 

 spines. It seems to be quite new, and so I have instituted a new 

 genus for it, and have called it Menfzeliopsis. It apparently 

 occurs only in the Kaihiku Beds. 



The representatives of the Athyrid or Spirigerid group are 

 especially interesting. Spirigera kailiiJtiiana, sp. nov., is confined 

 to the Kaihiku Beds, and belongs to the group of Sp. ivreyi already 

 described by Zittel, but occurring on a Carnic horizon. In the 

 Carnic a form occurs, which is related, as regards the thickening 

 of the hinge-region and cardinal process, to Sjnrigera oxycolpos 

 Emmrich, the largest and latest of the Alpine Athyrids confined to 

 the Phietic Koessen Beds. 



A still more specialized group, to which I have given the name 

 Hectoria (subgenus Clavigera of Hector), begins in the Carnic, and 

 becomes exceedingly common in the Phsetic. They are related to 

 Spirigera oxycolpos; but they are bisulcate, and have a still more^ 



