OLIVER: NEW ZEALAND PELECYPODS. 185 



14. Antigona oblonga (Grray). 



Dosina ohlonga, Gray, 1843, Dieffenbach's Travels in N.Z., vol. ii, 



p. 249. 

 Cytherea ohlonga (Gray, not Hanley), Suter, 1913, Man. N.Z. Moll., 



p. 985, pi. Ixi, fig. 2. 

 Antigona zelandica (not Gray), Iredale, 1915, Trans. N.Z. Inst., 



vol. xlvii, p. 495. 

 As a species, A. ohlonga is doubtfully distinct from A. zelandica. 

 It includes the oblong forms, which are not nearly so abundant as the 

 more ovate forms. Many specimens are difficult to assign definitely 

 to either species. The main characters relied on by Suter for 

 distinguishing ohlonga and crehra (= zelandica) are the shape of the 

 lunule and the angle made by the dorsal and anterior sides. The 

 lunule varies in shape with the width of the shell ; the more 

 ventricose the shell the wider the lunule. The angle made by the 

 dorsal and anterior sides is more important, as the narrower it is 

 the more prominent are the umbones. The brown colour markings 

 are found on both species, and are best seen in young specimens. 



Notopaphia elegans (Deshayes). 



15. Notopaphla., n.gen. 



Venerupis elegans, Deshayes, difiers from true Venerupis and the 

 allied genera, Paphia, Protothaca, and Marcia, in the characters of 

 the teeth and in possessing a well-defined lunule. I therefore 

 propose it as the type of a separate genus, Notopaphia. 



The essential characters are : The anterior cardinals are directed 

 forwards and parallel, or nearly so, to the margin of the shell ; 

 the lunule is deeply impressed ; the sculpture consists of concentric 

 laminae and fine radial striae, and the inner margins of the valves 

 are crenulated. The right side of the lunule is larger than the left ; 

 in the escutcheon the reverse is the case. Pallial sinus, triangular. 



16. Venerupis reflexa. Gray. 



Venerupis reflexa, Gray, 1843, Diefienbach's Travels in N.Z., vol. ii, 

 p. 250 ; Suter, 1913, Man. N.Z. Moll, p. 998, pi. Ixii, fig. 7. 



Venerupis siliqua, Deshayes, 1854, Proc. Zool. Soc, 1853, p. 5, 

 pi. xviii, fig. 1; Suter, 1913, Man. N.Z. Moll., p. 999, pi. Ixii, fig. 8. 



VOL. XV. — MARCH, 1923. 13 



