212 Dll. C. T. THECHM.VyX OX [vol. Ixxiii, 



Paljeocaedita quadeata, sp. nov. (PL XXI, fig. 11.) 



Shell thick, stronoiv arched, with a hio-h rounded ride-e iDassiiio- 

 from the beaks to the lower or hinder margin and merging into the 

 rounded surface of the shell. Beaks prominent, rather anteriorly 

 situated, tapering, and rolled. Shell-margin rounded in front, 

 bluntly angulate behind, and rather less sharply angulate below 

 where the ridge joins the lower margin. The marginal outline and 

 the position of the beaks vary somewhat in different examples. 

 'The upper posterior margin is not alate. 



Sixteen or seventeen sharp, raised, radial ribs pass from the beak 

 to the margins, the shallow sunken furrow between them in Avell- 

 preserved specimens is marked with very fine, sharp, regular, closely- 

 set, concentric growth-lines which also cross the ribs. -The anterior 

 muscle-scar is deep and well marked, and is situated closely 

 iidjoining the upper anterior margin. 



A left valve from Nugget Point is 20 mm. long, 18 mm. high. 

 A right valve from Otamitais 18 mm. long, 16 mm. high, and 8 mm. 

 •deep. 



Locality and horizon. — I collected many specimens with 

 badly-preserved test in a loose block of very hard, coarse, felspathic 

 sandstone on the shore at Nugget Point ; but I traced the bed in 

 the cliff where it occurs above the 2Iyfilus-])rohlematiciis Bed. 

 Yalves of Solcomda sp., gasteropods, etc., occur also in the same 

 deposit. I found a right valve in Bed c at Otamita with part of 

 the shell very well preserved. Carnic. 



Remarks. — PalcBocardita is now regarded as connected with 

 the Pleuro]Dhorid3e rather than with the Tertiary and recent 

 Cardiioe. The form now described is related to the Alpine forms of 

 which Bittner records four species in the St. Cassian Beds. It is 

 as strongly arched as P. hniecJii Bittner, but is much shorter and 

 more quadrate in outline. It is more strongl}^ arched than the 

 common P. crenata Groldfuss, and the upper posterior portion of 

 the shell is less expanded than in the Alpine species. In the Alps 

 the Falcsocardita Beds mark a horizon in the Carnic, and in New 

 Zealand the genus seems to occupy an analogous position. 



PLEUEOPHOErs zEALAXDicus, sp. nov. (PL XXI, fig. 6.) 



Shell thick and solid, oblong and produced behind ; the hinge- 

 line is arched, and the surface of the shell is rounded. The beaks 

 are very small and anterior, in some specimens terminal, and 

 scarcely project from the regularij'-rounded anterior outline of the 

 shell. A broadly-rounded ridge passes from the beaks to the 

 lower posterior margin, and between this and the hinge-margin 

 occur two or three faintly- marked ridges. The lunule is obscure, 

 but there is a long concave escutcheon behind the beaks. The 

 concentric growth-lines are prominent, closely set, and regular. 

 The anterior muscle-scar is deep and rounded, and the pallial im- 

 l^ression is well marked. Length = 63 mm. ; height = 25 mm. 



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



