Cytherea.] PELECYPODA. 985 



subequal, broadly pyriform, not deep. Pallial line very distinct, 

 distant from the margin ; the pallial sinus short, narrow, trigonal, 

 sharply pointed. 



Length, 49 mm. ; height, 45 mm. Length, 43 mm. ; height, 

 36 mm. ; diameter, 26 mm. 



Type in the Dominion Museum, Wellington. 



Hob. North Island : Hauraki Gulf, Manukau Harbour. 



2. Cytherea oblonga, Hanley, 1828. Plate 61, figs. 2, a. 



Venus oblonga, Hanley, in Wood's Index Test., Suppl., 1828. F. (Ventricula) 

 oblonga, Hanley, Grit. List, 44; Hutton, J. do Conch., xxvi, 49; 

 M.N.Z.M., 147 ;" P.L.S. N.S.W., ix, 521. Chione oblonga, Hanley, Index, 

 89. Dosina oblonga, Gray, Dieff. N.Z., 249 ; C.M.M., 69. Venus oblonga, 

 Gray, Ereb. & Ter., 6, pi. 2, f. 1. Dosina zelandica, Gray, Yate N.Z., 

 309"; Dieff. N.Z., 249. 



Shell of moderate size, ovato-cordate, veutricose, solid, hght brown, 

 concentrically laminated, and faintly radially striated. Beaks pro- 

 minent, swollen, sharply pointed, incurved and directed forwards, 

 approximate. Anterior end shorter, occupying a little over one- 

 fourth of the length, regularly convex, the dorsal margin short, straight, 

 very oblique ; posterior end sometimes lightly truncated, generally 

 convex, the dorsal margin a little convex, slowly descending ; basal 

 margin broadly arcuate. Lunule large, ovate-cordate. Escutcheon not 

 denned. Sculpture consisting of rather close, regular, slightly elevated, 

 sharp, concentric lamellae, higher at each. end, sometimes crenulated 

 by the usually faint radial lines. Colour brown or yellowish-brown, 

 occasionally with a few radiate streaks of fulvous below the umbones. 

 Interior white, porcellanous. Margins finely crenulated. Hinge-plate 

 solid, rather short, concave below behind the beaks ; right valve 

 with 3 cardinals, like those in C. crebra, with a shallow pit in front ; 

 left valve also with 3 cardinals similar to those of the last species, 

 and 1 tubercular lateral tooth. Ligament strong, deep-set. Adductor- 

 scars subequal, large pyriform. Pallial sinus short, narrow, sharply 

 pointed, triangular. 



Length, 57 mm. ; height, 47 mm. ; diameter, 31 mm. 



Type of Dosina zelandica and D. oblonga, Gray, in the British 

 Museum. 



Hob. Throughout New Zealand, from low- water mark to about 

 30 fathoms. Chatham Islands. 



Fossil. -Miocene and Pliocene. 



3. Cytherea subsulcata, Suter, 1905. Plate 61, fig. 3. 



Chione subsulcata, Suter, P. Mai. S., vi, 1905 205. Venus sulcata, Hutton, 

 P.L.S. N.S.W. (2), i, 1887, 226 ; Plioc. M., 81, pi. 9, f. 87 ; not of 1875. 



Shell moderately large, ovate, somewhat ventricose, with broad 

 depressed and flattened concentric ribs and radial striae, thick, the 



