Cuspidaria. \ PELECYPODA. 1037 



striae, with but little stronger inequidistant marks of rest ; the 

 rostrum finely concentrically lamellate, without radial sculpture. 

 Colour white, lightly iridescent in some places. Interior white, shining, 

 with fine radial striae. Margins smooth. Hinge-plate very narrow, 

 slightly buttressed posteriorly, with a small resilifer below the beak ; 

 right and left valve with a very small posterior lateral tooth. Liga- 

 ment very small, linear. Adductor-scars rather large. Pallial sinus 

 not deep, broadly rounded. 



Length, 13 mm. ; height, 6 mm. ; diameter, 44 mm. 



Type in the Dominion Museum, Wellington. 



Hob. Off Flat Point, in 75 fathoms (Captain Fairchild). 



Remark. This species may be allied to the fossil C. Kirki, Hutton 

 (Necera Kirki, Hutt., C. Tert. M., 18), from the Oamaru formation, 

 but the diagnosis is quite inadequate, and the species has not been 

 figured ; it is slightly higher in proportion than the Recent species, 

 and somewhat larger (15-5 mm. by 1O25 mm.). 



2. Cuspidaria Trailli, Hutton, 1873. Plate 54, figs. 17, a. 



Necera Trailli, Hutton, C.M.M., 62 ; J. de Conch., xxvi, 45 ; M.N.Z.M., 137 ; 

 P.L.S. N.S.W., ix, 514. Cuspidaria Trailli, Hutton, Index, 87 ; Hedley, 

 T.N.Z.I., xxxviii, 73, pi. 2, f. 9-11. 



Shell small, pyriform with a straight rostrum, slightly inequivalve, 

 the right valve being a little less inflated, moderately ventricose in 

 front, distantly concentrically sharply ridged, rostrum with a few 

 radial riblets, light brown. Beaks at about the anterior third of 

 length, not much raised, approximate, directed forwards, the pro- 

 dissoconch minute, smooth. Anterior end short, convex, the dorsal 

 margin straightened, descending ; posterior end narrowed to a rather 

 long straight rostrum, gaping at the end, the dorsal margin slightly 

 excavated ; basal margin broadly rounded in front, a little concave 

 towards the rostrum. Lunule obsolete. Escutcheon elongate, deeply 

 excavated, broader on the left valve. Sculpture consisting of rather 

 distant fine and sharp concentric liree, the interstices with fine growth- 

 lines ; rostrum with a number (5 to 7) of radiate riblets, obliquely 

 descending from the beaks. Epidermis light brown, thin. Colour 

 white when devoid of epidermis. Interior white, with faint radial 

 striae on the anterior part. Margins smooth. Hinge : Right valve 

 without cardinal tooth, a small lateral in front of the umbo, and a 

 more prominent distant posterior lateral tooth ; left valve without 

 teeth ; resilifer small, oblique ; a very small lithodesma is present. 

 Ligament obsolete. Adductor-scars unequal, the posterior larger. Pal- 

 lial sinus not deep, broadly triangular. 



Length, 10 mm. ; height, 5*5 mm. ; diameter, 4 mm. 



Type lost. 



Hob. Stewart Island, 14 to 18 fathoms ; Dusky Sound (A. 

 Hamilton) ; off Great Barrier Island, in 110 fathoms ; near Cuvier 

 island, in 38 fathoms (Captain Bollons). 



