Ikkdalr. — Suter's ''Manual of the New Zealand Mollusca." 489 



Arcopagia disculus (Deshayes, 1855). [P. 951.] 



The species of the group offer such well-marked features that Arcopagia 

 needs generic distinction as above, and should not be submerged in Tettina. 

 Hedley, whom 1 have already indicated as inclining to the use of genera of 

 wide limits, has admitted (Proc. Linn. Soc. N.S.W.. vol. xxxiv, pp. 433-34, 

 1909) Arcopagia generically. 



Tellina gaimardi nom. nov. [P.J952.] 



This name must replace Tellina alba Quoy and Gaimard, 1835, as there 

 is a prior Tellina alba Martyn, Univ. Conch., vol. iv, fig. 157, 1787. All 

 the specimens in the British Museum have been named as above for the 

 last fifty years, but I have been unable to trace this name in literature. 

 Bertin (Nouv. Arch. Mus. d'Hist. Nat. Paris, 2nd ser., vol. i, p. 285, 1878) 

 states that Quoy and Gaimard's type came from New Ireland; but this 

 is obviouslv an error for New Zealand, as that locality is given by the 

 authors. 



Macoma edgari nom. nov. [P. 953.] 



Tellina glabrella Deshayes, 1855, was anticipated in usage by Chiaje 

 (Mem. Anim. s. Vert. Napoli, tab. pro. v and vi, 1830, pi. 82), and I propose 

 to rename it as above. The reference to the genus Macoma is due to the 

 fact that on the back of the type-tablet Mr. E. A. Smith has noted that 

 the shell must be there placed. 



Leptomya perconfusa nom. nov. [P. 956.] 



When Mr. E. A. Smith, on Suter's inquiry, showed the shell known to 

 Neozelanic workers as Tellina strangei had been incorrectly identified, and 

 was a member of the genus Leptomya, Mr. Suter adopted Hutton's specific 

 name from Tellina lintea. But that combination had been utilized many 

 years before Hutton chose it by Conrad in the Journ. Ac. Nat. Sci. Philad., 

 1st ser., vol. i, p. 259, 1837. Instead of Hutton's name, I propose the above 

 as a suitable cognomen. 



Fam. Amphidesmatidae Ireclale. [P. 956.] 



I have found no worse confusion than in the present group called the 

 family Mesodesmatidae by Suter, following Dall. Unfortunately, an early 

 error having crept into Dall's researches, the whole matter must be re- 

 viewed, and this review has necessitated considerable rearrangement. 



Mesodesma was introduced by Deshayes in the Ency. Meth. Vers., vol. ii, 

 p. 441, the title-page of the volume bearing the date 1830; but Sherborn 

 and Woodward (Ann. Mag. Nat. Hist., 7th ser., vol. xvii, p. 579, 1906) have 

 shown that the page quoted, was not published until 1832. Seven species 

 are listed, the names and localities being, — 



P. 442 : M. donacina ex Lamarck. New Zealand (Q. & G.). 



P. 443 : M. chemnitzii nov. for Chen. 6, 3, figs. 19, 20. Indian Ocean. 



M. quoyi nov. New Zealand (Q. & G.). 



M. striata ex Linne. New Holland. 

 P. 444 : M. donacilla ex Lamarck. Mediterranean. 



M. gaymardi nov. New Zealand (Q. & G.). 



M. trigona nov. Praslin Harbour, New Holland. 



