Suxer. — Notes on New Zealand Mollusca. 319 



to correct in Captain Hutton's diagnosis — viz., the posterior 

 cardinal of the right valve, and the anterior cardinal of the 

 left valve, are bifid, as will be seen from the figure of the left 

 valve (fig. 866). 



Mactra ordinaria, E. A. Smith (1898). 

 Mactra triangulares Hector, Cat. Col. Museum N.Z., 1870, p. 173 

 (not of Lamarck). M. elegans, Hutton, Cat. Tert. Moll. 

 N.Z., 1873, p. 19 (not of Sowerby, 1825). 



In the " Pliocene Mollusca of New Zealand " Captain 

 Hutton puts his M. elegans as a young form of M. cequilateralis, 

 Desh. I compared specimens from the Pliocene of Wanganui 

 with my co-types of Smith's species, and found them to agree 

 in every detail. 



Mactra lavata, Hutton (1885). 

 Index Faunae N.Z., p. 90. 



I have examined a specimen obtained by Mr. A. Hamilton 

 at Petane, and gone over the description and figures in the 

 " Pliocene Mollusca of New Zealand," and arrived at the con- 

 clusion that it is not a Mactra, but merely a young form of 

 Standella ovata, Gray, of which it therefore should be consideied 

 a synonym. 



Mesodesma australis, Gmelin (1792). 

 Mya novce-zeelandice, Chemnitz, Conch. Cat., vol. vi, 1782, p. 30, 

 pi. iii, figs. 19, 20. Mya australis, Gmelin, Svst. Nat., xiii, 

 1792, p. 3221. 



Chemnitz being polynomial in vol. vi, the name used by 

 Gmelin has to be adopted. 



Corbula macilenta, Hutton (1873) 



Corbula macilenta, Hutton, Cat, Tert. Moll. N.Z., 1873, p. 18. 

 (?) Corbula erythrodon, Von Martens, Crit. List, Moll. N.Z., 

 1873, p. 41 ; Hutton, Journ. de Conch., vol. xxvi, 1878, 

 p. 44; Man. N.Z. Moll, 1880, p. 135; Proc. Linn. Soc. 

 N.S.W., vol. ix, 1884, p. 513; Pliocene Moll. N.Z., 1893, 

 p. 74 ; Suter, Fauna Novae-Zealand., 1904, p. 88 (not of 

 Lamarck). Corbula pura, Webster, Trans. N.Z. Inst., vol. 

 xxxvii, 1905, p. 279, pi. x, figs. 12, 12a. 



The late Professor Von Martens was very doubtful about 

 identifying our species with the Japanese C. erythrodon, Lamk. 

 Mr. Hedley, in his paper on the Pelecypoda dredged in 

 110 fathoms off Great Barrier Island (this volume), points out 

 that the New Zealand species hitherto known as C. erythrodon 

 is very different from Lamarck's species, and that it should be 



