188 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



it is from such an ancestor as this that the recent forms have 

 descended. The early Pliocene A. crassiformis is a still deeper shell. 



19. DOSINIA MAORIANA, n.sp. 



Dosinia ccerulea (not Reeve), Suter, 1906, Trans. N.Z. Inst., 



vol. xxxviii, p. 318; Suter, 1913, Man. N.Z. Moll, p. 977, 



pi. 60, fig. 8. 



A shell rather rarely found in New Zealand is that hitherto recorded 



as Dosinia ccerulea. The true ccerulea is a Tasmanian and south- 



. east Australian species, easily separated from the New Zealand shell 



by its flauch less prominent sculpture and less ventricose form. The 



New Zealand species appears to be a very distinct form, and as, so 



far as I am aware, it is not referable to any known species, I suggest 



the name maoriana for it. Type in the Dominion Museum. 



D. ccerulea is far more closely related to D. lambata than to D. 

 maoriana. 



