Lasaea.] PELECYPOUA. 927 



very short and stout, the upper tooth mostly reduced to a tubercle, the 

 2 posterior laterals longer, very often rudimentary ; left valve with 

 2 oblique lamellae behind the central resilifer, and 2 oblique short 

 lamellae in front, the inner of which is sometimes minute and may be 

 taken as the cardinal tooth. Resilium large, calcareous, extending 

 from the centre along the whole lower posterior part of the hinge- 

 plate. Adductor-scars oval, the anterior larger. Pallial line entire. 



Diameter Ant. -post., 3mm.; dorso-ventral, 2-5 mm. : thick- 

 ness, 2 mm. 



Hob. Banks Peninsula ; Dunedin Harbour (A. Hamilton) ; Snares 

 and Bounty Islands, in 50 fathoms (Captain Bollons) ; Chatham 

 Islands ; Auckland Islands (Professor Benham) ; Campbell Island 

 (Professor Chilton) ; Macquarie Island (A. Hamilton). The type is 

 from the Mediterranean. The species is also recorded from the North 

 Atlantic, Cape of Good Hope, and Strait of Magellan. 



2. Lasaea neozelanica, n. sp. Plate 54, tig. 1. 



Shell small, ovato-rotund, inequilateral, somewhat inflated, con- 

 centrically striate and finely wrinkled, yellowish - brown. Beaks 

 prominent, slightly inclined forward, pointed, contiguous. Anterior 

 end longer than the posterior, produced and narrowly convex below, 

 the dorsal margin faintly convex and descending ; posterior end 

 regularly rounded, acutely convex towards the broadly rounded basal 

 margin. Sculpture consisting of well-marked irregular concentric 

 striae, the interspaces with fine wrinkle striation and punctures. 

 Epidermis thin, shining, horny. Colour yellowish - brown. Interior 

 bluish-white, shining. Margins smooth, sharp. Hinge-plate well de- 

 veloped, arcuate ; right valve with a central narrow cardinal, 2 

 lateral teeth in front, the lower one stronger and triangularly raised 

 distally, and 2 laterals at the posterior end, the lower one also better 

 developed and raised towards the end ; left valve with a rather stout 

 central cardinal tooth, 1 sharp lamina in front, and 1 lateral tooth 

 behind, which has a tubercular excrescence at the end of the resilifer, 

 which is long, extending from the centre along the greater length of 

 the lower part of the posterior hinge-plate. Adductor-scars distinct, 

 the anterior larger, oval, the posterior smaller, roundish. Pallial line 

 entire. 



Diameter Ant.-post., 7mm.; dorso-ventral, 6mm.: thickness. 

 4-5 mm. 



Type in my collection. 



Hab. Port Pegasus, Stewart Island, in 18 fathoms, type (Captain 

 Bollons) ; near Little Barrier Island, in 20 fathoms (R. H. Shakespear). 



Remarks. This species is nearest to L. rubra, but the anterior 

 lateral teeth are much better developed, longer, the concentric 

 sculpture is much finer than is usually the case in the type, the colour 

 is different, and the hinge-margin has no trace of red colour. 



