PELECYPODA I7S 



rounded low down on the same level as the rostrum. The lower angle of the rostrum 

 marks a weak angulation which proceeds towards the umbo, but fades out entirely be- 

 fore reaching it. Sculpture of weak microscopic closely spaced concentric growth lines. 

 Hinge of left valve edentulous, that of right valve with an anterior and a posterior 

 lateral, the latter being lamellate triangular and projecting forwards into the left valve. 

 There is a broad rounded pallial sinus. 



Length 4-4 mm.; height 2-9 mm.; thickness (one valve) 0-9 mm. (Holotype). 



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



Austroneaera finlayi, n.sp. (Plate XLVIII, fig. 12). 



Shell small, thin, trigonal, almost equivalve; rostrum abruptly truncated. Anterior 

 and posterior dorsal slopes fairly straight, sharply and uniformly descending. Ventral 

 margin convex, barely incurved below the truncated rostrum. Anterior end rather 

 narrowly rounded low down on the same level as the rostrum. No clearly defined angle 

 separating the rostrum from the rest of the shell. Surface smooth except for very faint 

 irregular concentric growth lines. Hinge of left valve edentulous, that of right valve 

 with an anterior and a posterior lateral, the latter being lamellate triangular as in the 

 preceding species. Resilium large triangular, set slightly posterior to the beak. 



Length 3-5 mm. ; height 2-5 mm. ; thickness (one valve) 0-7 mm. (Holotype). 



Habitat: 60 fathoms off the Poor Knights Islands. 



Holotype in the collection of Dr H. J. Finlay, Dunedin, New Zealand. 



This species closely resembles the genotype, from which it differs mostly in shape, 

 being proportionately much shorter. 



Class GASTEROPODA 



Family SCISSURELLIDAE 



Genus Scissurella, d'Orbigny, 1824 



Type: Scissurella costata, d'Orbigny 



Scissurella manawatawhia, n.sp. (Plate XLIX, fig. 1). 



Shell minute, thin, white, ovate, sculptured with strong oblique squarish radial cords 

 and less conspicuous spiral threads. Whorls 3^, including a minute flattened radially 

 ribbed protoconch of 1} whorls. Spire about one-third height of aperture. The radials 

 number sixteen on the last whorl and they extend from the suture to the minute 

 umbilical chink except for the interruption of the fasciole girdle, which is sunken, with 

 raised edges, and is situated above the middle of the whorls. The fasciole girdle com- 

 mences at the close of the penultimate whorl. Slit deep, extending back over about one- 

 third of the body whorl. There are four equispaced spiral threads between the fasciole 

 girdle and the upper suture and nine below the girdle on the body whorl and base. 

 Aperture oblique-oval. Peristome thin, continuous across parietal wall, broken only 

 by the slit. 



