"232 DE. c. T. TEECH]yLA-yx OX [vol. Ixxiii, 



One specimen measiu-es 41 mm. in length and 31mm. in width; 

 ■another, of more triangular outline, is 16 mm. long and 52 mm. 

 wide. 



Locality and horizon. — It is confined to the Kaihiku Beds, 

 .and casts are veiy common at Caroline Cutting, Kaihiku Grorge, 

 and other localities. I have a few specimens with the shell 

 jDreserved, as also a large number of casts. Ladino-Carnic. 



Remarks. — This species belongs to the group of ^pirigera icreyi, 

 but is larger, has a more oval or elongate outline, the delthyrial 

 Tegion is more hidden by the dorsal beak, the pedicle-passage 

 remained wide and open, the fold and sinus are much feebler, 

 and the shell- structm-e is more coarsely^ fibrous. It occurs on a 

 lower horizon than ^S^;. wreyi, which is a Carnic fossil. 



'Spieigeea MAis^zAViis'ioiDEs, sp. nov. (PI. XXY, figs. 7 a & 7 5.) 



Shell wider than long; valves only slight^ convex near the 

 beaks, the ventral rather more so than the dorsal, becoming flat- 

 tened towards the margins. Near the anterior margin there is a 

 broad but feeble ventral sulcus, and a low and broad rounded 

 •dorsal ridge bounded by wide, feebly-marked, lateral sulci. The 

 area is small, and less than the width of the shell ; the beak is very 

 small and j^ointed, and projects but very slightly over the hinge- 

 line. The pedicle-passage is minute. The growth-interruptions 

 are prominent, foliaceous, irregular, and widely spaced, and the 

 interspaces are marked with very faint, regular, parallel, concentric 

 striae. The shell-structure is coarsel}^ fibrous, the fibres directed 

 towards the median line. A typical, somewhat flattened, specimen 

 is 30 mm. long and 40 mm. wide. 



The internal structure is as follows : it has a thickened ventral 

 hinge-region and a large cardinal process, beneath which a cavity 

 projects backwards into the beak region, and is divided by a short, 

 blunt, median septum. The end of the cardinal process carries a 

 i:riangular depression, and there are prominent ventral hinge-teeth 

 supported by plates. 



Locality and horizon. — I collected six or seven specimens 

 in dark shales along with Halohia zitteli var. zealandica in Bed e, 

 Otamita, Hokonui Hills. They have the shell preserved, but are 

 somewhat flattened or laterally distorted. Carnic. 



Remarks. — This shell belongs to the group of Sjjirigera 

 oxycolpos Emmrich, of the Ehaetic Koessen Beds, the latest and 

 largest of the European Spirigerids ; but it differs in being much 

 Hatter, whereas the full-grown 8p. oxycolpos is a swollen and 

 rounded shell. It comes very near in shape and outline to 

 Sp. manzavinii Bittner^ of the Upper Trias of Balia in Asia 

 Minor, a form which (as Bittner remarks) bears comparison with 

 the New Zealand sj^ecies Sp. lureyi. In Sp. manzavinii, however, 

 the foramen is large, whereas in the present form it is quite minute. 



1 Bibliograpliy, 6, sli, p. 107 & pi. i, figs. 9-11. 



