272 Transaction*. 



Posterior cardinal tooth in the left valve less markedly bihd than in 

 D. greyi Zittel, but well separated from the posterior cardinal tooth. 

 Anterior lateral tooth small, but the posterior lateral large, long, and sharp. 



A single left valve, in good condition. Type in the Wanganui Museum. 



This species is closely related to D. greyi Zittel. 



Cardium (Glans) kaiparaensis n. sp. (Plate XXI, figs. 5, 5a.) 



Shell small, nearly orbicular : height, 30 mm. ; length, 35 mm. : 

 somewhat inequilateral and ventricose. Umbo pointed well forward and 

 strongly incurved. Anterior end the shorter and regularly rounded. 

 Dorsal margin gently sloping and ventral margin broadly rounded. 

 Sculpture : The surface is coarsely ribbed, some 35 ribs being present. 

 The ribs are narrower than the interstices, sharp and strongly nodulose. 

 Interstices crossed by numerous fine concentric threads, which do not cross 

 the ribs. Margin sharply dentate. Hinge-plate bow-shaped. Left valve 

 with 1 large cardinal tooth, 1 large and long posterior lateral, and 1 short 

 anterior lateral. Right valve : cardinal tooth long and slender ; posterior 

 lateral long, and anterior lateral small. 



A common species at Pakaurangi Point, but the shells vary greatly in 

 size. Type in the Wanganui Museum. 



Tellina (Arcopagia) inconspicua n. sp. (Plate XIX, figs. 1, 2.) 



Shell small, very thin, broadly oval : length, 14 mm. ; height, 8 mm. ; 

 thickness, 4 mm. : slightly compressed, somewhat inequilateral. Beaks 

 rather produced, situated a little behind the middle. Dorsal edge straight, 

 ventral margin strongly rounded. Valves equally convex. Sculpture 

 consisting of numerous fine rather irregular concentric rounded ridges. 

 A large rounded radiating rib on the posterior portion of the right valve. 

 In the right valve the two cardinal teeth are of equal size. The anterior 

 lateral tooth is much nearer to the cardinals and is much larger than the 

 posterior tooth. 



Not uncommon, but the thin and fragile nature of the shell makes it 

 difficult to obtain good specimens. Type in the Wanganui Museum. 



Macrocallista sculpturata n. sp. (Plate XXI, figs. 6, 6a.) 



Shell small, broadly ovate : height, 20 mm. ; width, 25 mm. Dorsal 

 margin arched. Anterior margin at first straight, then arched and rounded. 

 Ventral and posterior margins well rounded. The 3 cardinal teeth are well 

 marked and large. The first anterior lateral is small and obtuse. The 

 second anterior lateral is long and reaches to the margin. The 2 posterior 

 lateral teeth are sharp. Sculpture : A fine general concentric striation is 

 nearly obsolete. On the posterior portion a series of fine wavy striations 

 nearly parallel to the margin. On the anterior portion an angular or 

 V-shaped sculpture can be seen over a portion of the surface. 



A single right valve in a good state of preservation. Type in the 

 Wanganui Museum. 



Corbula nitens n. sp. (Plate XIX, figs. 4, 7.) 



Shell very small : height, 4 mm. ; length, 7 mm. : subtrigonal. Valves 

 not greatly unequal in size, but the right valve is considerably more 

 convex than the left. Umbones of the two valves equal and incurved. 

 Dorsal margin sloping. Anterior end distinctly the shorter, and rounded ; 

 posterior end rather the longer, and rostrate. Ventral margin gently 

 rounded. Sculpture : Both valves with a rounded ridge extending from 



