PELECYPODA 171 



right valve with a broadly triangular cardinal and two laterals. Margin of valves weakly 

 crenulate along the ventral edge. Muscle scars ovate, subequal. 



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



Habitat: Off Waikuku Beach, near North Cape, St. 930, 29 m. 



Pleuromeris latiuscula benthicola, n.subsp. (Plate XLV, fig. 6). 



Shell similar to above in all respects except shape, being constantly more broadly 

 triangularly ovate in outline. It is a deep-water relative of the above-described species, 

 but nomenclatural separation is desirable as both forms are quite distinct and constant 

 at their respective stations. 



Length 2-6 mm. ; height 2-3 mm. ; thickness (one valve) 07 mm. (Holotype). 



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



In their rounded shape these shells resemble Carditella, but the hinge characters and 

 the absence of pronounced granulation of the radials are more in accord with Pleuro- 

 meris. 



Family LUCINIDAE 



Genus Epicodakia, Iredale, 1930 



Type (original designation): Epicodakia consettiana, Iredale, 1930 

 = Lucina minima, Ten. -Woods 



Epicodakia neozelanica, n.sp. (Plate XLVI, fig. 8). 



Shell small, ovate, inequilateral, the posterior side the shorter, moderately convex, 

 with blunt rounded incurved beaks. Sculpture of closely spaced flattish narrow con- 

 centric ridges, crossed by almost obsolete closely spaced radials ; these show faintly on 

 the anterior end where they render the concentric ridges weakly granulose, but barely 

 show on the rest of the shell. Margins smooth and bevelled. Hinge in left valve with a 

 strong bifid narrowly triangulate cardinal and a well-defined anterior and posterior 

 lateral; right valve with two divergent narrow cardinals and two laterals. Ligament 

 long and narrow, set just within the dorsal margin. Colour dull white. 



Length 5-5 mm.; height 4-2 mm.; thickness (one valve) 1-5 mm. (Holotype). 



Length 8-0 mm. ; height 6-5 mm. ; thickness 2-3 mm. (largest paratype).' 



Habitat: Off Three Kings Islands, St. 934, 92 m. ; St. 929, off Spirit's Bay, northern 

 New Zealand, 59 m. 



This species is close to the New South Wales and Tasmanian genotype, but may be 

 distinguished by its more ovate shape and almost obsolete radials. The genus is new to 

 the New Zealand fauna. 



Family ERYCINIDAE 

 Genus Notolepton, Finlay, 1926 

 Type (original designation) : Kellia antipoda, Filhol 

 Notolepton sublaevigatum, n.sp. (Plate XLVII, fig. 7). 



Shell small, thin, pellucid white, ovate, broader than high, very little inflated. Beaks 

 small but prominent, inclined forwards. Anterior end slightly shorter than posterior 



3-2 



