BY CAPTAIN F. W. HUTTON, F.G.S. 517 



Myodora Boltoxi. Smith, Pro. Zool. Soc, 1880, p. 585 ? 

 pi. 53, fig. 9. 



Habitat. — Auckland (Col. Bolton). 



I have not seen this species. 



Shell transversely elongated, but differs from pandoriformis in 

 being less strongly sulcated, and less broadly truncated behind, 

 less curved on the front dorsal mai'gin, and the pallial sinus is 

 deeper. The hinder dorsal slope is shorter than the anterior. The 

 sculpture is not so coarse as in antipodum, and the pallial sinus is 

 deeper and not so broad. 



Chamostr.ea albida. Lamarck, Anim, s. Vert., 2nd edition. 

 Vol. VI., p. 585. 

 Habitat. — North Island ; Chatham Islands. 

 Found also in Australia and Tasmania. 



Family. MactridyE.* 



Mactra discors. Gray, Mag. Nort. Hist., 1837, p. 371, Voy. 

 Erebus and Terror, Moll., pi. 2, fig. 4 ; Reeve, Conch, Icon, 

 fig. 17 (1854). M. murchisoni, Deshayes, Pro. Zool. Soc, 

 1854 ; Reeve, Conch. Icon., fig. 7C. 



Habitat. — Throughout New Zealand. 



Mactra yequilatera. Deshayes, Pro. Zool. Soc, 1853, p. 17; 

 Voy. Erebus and Terror, Moll., pi. 2, fig. 10 ; Reeve, Conch. 

 Icou., fig. 14. M. elegans, Hutton, Cat. Tertiary Moll, of 

 New Zealand, p. 19 (juv). 

 Habitat. — Thoughout New Zealand. 



Mactra scalpellum. Deshayes, Pro. Zool. Soc, 1854 ; Reeve, 



Conch. Icon., fig. 106. Darina picsilla, Hutton, Cat. Marine 



Moll, of New Zealand, p. 64, (1873). 



Habitat. — Stewart's Island ; Auckland (Strange). 



* The following species are omitted : — 

 Mactra donaciformis. Gray. 

 C&cella Zealandica. Deshayes. 





**»*' v. 



