part 3] THE TRIAS OF NEW ZEAJjJlNB. 207 



produced and pointed. The lower posterior margin is rounded and 

 slightly produced; the upper anterior margin is apparentl}^ well 

 rounded. The surface-decoration consists of fine, closely-set, 

 rather foliaceous, concentric growth-lines. 



Locality and horizon. — Bed c, Otamita, Hokonui Hills. 

 Carnic. I collected a single left valve ; unfortunately^ the margins 

 are somewhat damaged. 



Rema-rks. — This specimen is too imperfect for a specific deter- 

 mination, but is undoubtedly a CassianeUa. 



Aj^odoxtopiioka. (PL XXI, figs. 8-10.) 



The three bivalves which will now be described appear to belong 

 to the genus Anoplopliora of Sandberger : this is a preoccupied 

 name, which Cossmann has replaced by that of Anodontopliora . 

 although, owing to the somewhat uncertain characters of the genus, 

 the identification is not entirely beyond doubt. 



Zittel^ says <di. Anoplojjliora that the hinge-teeth are wanting, 

 and that the hinge-margin is somewhat thickened in front of and 

 behind the beak; the anterior muscular depression is heart-shaped 

 and wide, the posterior one slightly sunken, and the pallial line is 

 marginal and linear. 



Dr. W, H. Dall " includes Anoplopliora in the Cardiniidse, and 

 says that in the right valve there is a blunt, thick, cardinal tooth 

 fitting into a socket in the opposite valve, and beside the socket a 

 long posterior lateral tooth. 



Bittner^ saj^s of the Himalayan form Anodontopliora grieshaclii 

 that the test is thin near the umbones, and a slight filing was 

 sufficient to prove that a strong hinge-plate with tooth-structure 

 did not exist. He goes on to say that muscular impressions are 

 tolerably distinct for the thin shell, and that a pallial sinus is not 

 perceptible. 



In my New Zealand examples, which I am able to group into 

 three species, the shell is completely closed all round ; in two of 

 them it is very thin, but in the third rather thicker. I could 

 detect no impressions, either of the muscle-scars or of the pallial 

 line. As regards the dentition, a close examination of all the casts 

 in my possession showed no trace of hinge-teeth ; but there Avas 

 evidence of a thickening of the hinge-margin below and behind 

 the beak. 



Locality and horizon. — They seem to be confined to the 

 Carnic beds in New Zealand. I succeeded in collecting several 

 specimens with the shell ; but the}' generally occur as casts, and 

 are often more or less distorted and crushed. Sir James Hector's 

 identification of JEdmondia in these beds seems to have been based 

 on shells of this group. 



^ ' Handbuch der Palaontologie ' vol. i, pt. 2, p. 62. 



^ Zittel's 'Textbook of Palaeontology' [transl. Eastman] vol. i (1913) 

 p. 452. 



2 Bibliography, 5, p. 60. 



