LAMELLIBRANCHIATA. 65 



rounded, dorsal and ventral lines nearly parallel ; longitudinally plicato- 

 etriated. Tellowisli white, covered with a greyish olive epidermis, 

 which is finely longitudinally striated at the posterior end ; interior 

 white. Height, 175 ; length, 4. 



Common on the East Coast of the North Island, and at Massacre 

 Bay. Found also in Australia. 



Two other species of Zenatia (Z. cumingiana, Deshayes, and Z. 

 solenoides, Deshayes,) are recorded as coming from New Zealand, but 

 I have seen no descriptions of them. 



RAETA. 



Cordiform, ventricose, thin ; sub-angular and slightly gaping be- 

 hind; cardinal tooth strong, posterior lateral tooth small; ligament 

 sub-external, marginal, not separated from the cartilage. 



30. R. perspiciia, sp. nov. Ovate, ventricose and rounded in 

 front, compressed and sub-angular behind ; umbones posterior, turned 

 forwards, with broad rounded concentric corrugations that show in 

 the interior, and crossed by fine undulating transverse stria3. Yellow- 

 ish white. Height, 2 ; length, 275. 



VANGANELLA. 



Transversely oblong, thin, compressed, covered with a smooth epi- 

 dermis, sub-equilateral, rounded in front, attenuated and sub-angular 

 behind, with two divergent ribs in the interior ; cardinal teeth of the 

 left valve near together, those of the right valve separated ; lateral 

 teeth small, thin ; ligament sub-external, marginal, cartilage-plate, 

 elongated, not very deep. 



31. V. taylori, Gray. Anterior internal rib starting from the 

 cartilage plate, posterior just inside the posterior adductor impression. 

 Smooth, white ; epidermis pale brown. Height, 2 ; breadth, 4. 



FAMILY TELLLNID^. 



Generally with two cardinal teeth in each valve, occasionally with 

 lateral teeth ; shell compressed, usually closed and equivalve ; muscular 

 impressions rounded, pallial sinus very large ; ligament on the shortest 

 side of the shell, sometimes internal. 



PSAMMOBIA. 



Oval-oblong, equivalve, sub-equilateral, slightly gaping at each end ; 

 hinge straight, teeth f , sometimes bifid ; ligament external, prominent ; 

 muscular impressions large, equally distant from the hinge. 



Europe. India. Pacific. 



32. P. Stangeri, Gray, Dief. N.Z., ii., p. 253. Oblong, solid, 

 rounded in front and rather obliquely truncated behind, concentrically 

 striated. Purplish white, obscurely rayed with darker ; interior pink- 

 ish purple. Height, l - 5 ; length, 2'5. 



Common^ 



The Natives call this shell " wahawaha." 

 9 



