part 3] THE TEIAS OF ^'EW ZEALAIS'D. ISO* 



COIS-ULAEIA Sp. (PL XVIII, fig. 1.) 



Length =: originally about 27 mm. ; "width at the aperture = 9 mm. 

 The section seems to be more or less square or rectangular. In 

 most of its features this Convlaria resembles C. Jaevigafa Morris- 

 from the Pernio- Carboniferous of Australia, which also occurs in 

 beds of similar age in the Salt Range. In the fineness of its strise 

 it recalls also C. temiistriata McCoy. 



Locality and horizon. — Bed e, Otamita (Hokonui Hills) ;: 

 also in the Mytilus-prohlematicus Bed at Eighty-Eight A'alley, 

 near Nelson, and in the JPseudomonotis-riclnnondiana Bed on the 

 south side of the Hokonui Hills. Carnic and Noric. It seems to- 

 be widely distributed, but is scarce and, as a rule, poorly preserved. 



LAMELLIBRANCHIATA. 



The New Zealand Triassic Lamellibranchs are of considerable- 

 interest. An edentulous shell with a general resemblance to Cardio- 

 morplia I place, for want of contrar}^ evidence, among the Paheo- 

 conchs. Taxodonts are represented by Palceoneilo, Leda, and 

 Macrodon. Forms of great zonal value occur among the Aniso- 

 myarians, of which Daonella indica fixes the Ladino-Carnic horizon^ 

 several forms of Halohia the Carnic, while great masses of Pseudo- 

 monotis indicate the Noric horizon. The Alpine form, 3fonotis 

 scdinaria, also seems to occur ; but the exact horizon which it 

 occupies in New Zealand is not yet determined. Mytilus {?) 

 probJematiciis is an important fossil in the Carnic beds, hitherta 

 found only in the South Island, but it recurs in New Caledonia. 

 Forms of CassianeUa, Pinna^ Pecten, Limatula., etc., also occur. 

 A series of curious and very variable more or less Lima-Vik^ 

 Myalinidae is common in the Carnic. These forms show afiinities 

 with JPergamidia, JMysidia, and Mysidiopiera of the L'^pper Trias 

 of Asia Minor and the Alps, and I have applied to them the new 

 generic name Holtonuia. 



The Schizodonts include MegaJodon and several species of 

 JSLyoplioria, one of which has hitherto been mistaken by New 

 Zealand geologists for a Trigonia. The genus Anodontopliora, of 

 which at least three species occur, seems to be a Schizodont, the 

 dentition of which has become obscure or obsolete. The Eulamelli- 

 branchiata are represented b}^ PalcBocardifa, Pleuroplioriis, and 

 possibly Anisocardia. 



Caediomoepha (?) xucfGETE^'SIS, S23. nov. (PL XXI, fig. 7.) 



Shell thin and platy in structure. Valves apparently equal in 

 size, edentulous ; beaks ver}^ anterior, pointed, close together, and 

 incurved. Hinge-area long and slightly arched. Beneath the 

 beaks there is a sunken false lunular depression. The valves are 

 closed all round, except in the depression below the beak, where they 

 gape to a slight extent for a short distance, apparentl}^ in order to 

 allow the ^^assage of a byssus. The surface is decorated with broad 



