r 6 4 DISCOVERY REPORTS 



Family NUCULANIDAE 



Genus Nuculana, Link, 1807 



Subgenus Jupiteria, Bellardi, 1875 



Type (by subsequent designation, Dall, 1898): Nucula coticava, Bronn., Pliocene, Italy 



Nuculana (Jupiteria) manawatawhia, n.sp. (Plate XLV, fig. 9). 



Shell small, oval, inflated; beaks bluntly rounded, situated slightly in front of the 

 middle. Anterior and posterior ends narrowly convex, similar, except that the posterior 

 dorsal slope is lower and in consequence that end is a trifle more narrowly rounded than 

 the anterior. Rostrum ill defined, having only the faintest semblance of a bounding 

 ridge. Sculpture of faint low bevelled concentric ridges, about eighteen per millimetre, 

 which are strongest at the middle of the valves, but fade away almost entirely towards 

 the margins and beaks. Hinge strong, with nine anterior and eight posterior chevron- 

 shaped teeth. Pallial sinus shallow, its apex broadly U-shaped. Colour white. 



Length 4-2 mm. ; height 2-9 mm. ; thickness 1 mm. (Holotype, one right valve). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



Marwick has described seven Tertiary species of the subgenus Jupiteria from New 

 Zealand, but the above new species makes the first record of this subgenus from the 

 New Zealand Recent fauna. 



The species here described is not quite typical of the subgenus Jupiteria, but it seems 

 to be better placed there than in any other subgenus so far described. It closely re- 

 sembles Dall's Leda solidifacta (1886, Bull. Mus. Comp. Zool, xn, p. 252), which 

 Woodring (1925, Mioc. Moll. Bozvden Jamaica, Carnegie Publication No. 366, p. 19) 

 has accepted as a Jupiteria. 



Family LIMOPSIDAE 



Genus Aupouria, n.gen. 



Type : Aupouria parvula, n.sp. 



This genus is related to Austrosarepta, Hedley, 1899, but differs in having the 

 resilium pit shaped like an inverted U , and apart from the vertically striated ligamental 

 areas, it has, on the anterior end only, a pair of prominent transverse interlocking hinge 

 teeth. In shape the shell is suborbicular, resembling somewhat a juvenile Glycymeris. 

 The allied genus, Austrosarepta, has vertically striated ligamental areas also; but the 

 resilium pit is broadly triangular, the marginal hinge teeth are developed at both 

 extremities of the striated areas, and the outline of the shell is obliquely ovate to 

 trapezoidal. The writer has a second species of Aupouria from the mid-Pliocene of 

 New Zealand. 



