44 



not seen, but specimens so named in the Museum of the Ecole des 

 Mines at Paris are different from those quoted under that name 

 by Angas in 1865. Our shell is H. tenera, A. Ads. 



PART II.— LAMELLIBRANCHIATA. 



The communication under this head will constitute a Fourth 

 Supplementary List of the Lamellibranch Mollusca of South 

 Australia. The first revision was published in Trans. Roy. Soc, 

 S. Aust., vol. ix., pp. 76-111, 1887, and Supplemental Lists in 

 vol. X., 1888, vol. XIV., 1891, and vol. XV., 1892. 



Teredo adax, Hedley, P. Lin. Soc, N.S.W., 1895. This 

 species, though unnamed, was recorded by me Revision ix., p. 19, 

 1887. 



Barnea similis [Gray], Tate, op. cit. ix, p. 80, non Gray = B. 

 OBTURAMENTUM, Hedley, Records Austr. Mus., II., p. 55, t. 14, 

 1893. 



Saxicava arctica, Linnaeus. Saxicava venerijbrmis, Lamk.!, 

 and Corbula australis, Lamarck !, are the same, both types 

 equally large. 



Genus Cuspidaria. 



Cuspidaria Tasmanica, Tenison- Woods (Neaera), Proc. Roy. 

 Soc, Tasmania, for 1875, p. 27 (1876). 



Mr. E. A. Smith, in the Lamellibranchs of the Challenger Ex- 

 pedition, characterises 13 sections of the genus Neaera, denomi- 

 nated A to M. The dentition of the species here noticed was 

 unknown to him, which desiderrated information I now furnish. 

 It indicates a disposition of the hinge-teeth different from that of 

 each one of Smith's sections, and a new section is required to 

 receive it. The diagnosis is as follows : — 



Section N. 



Right valve with a lateral tooth on each side ; left valve with a 

 single tubercular denticle in front of the apex, no laterals. This 

 arrangement approximates to that in Section F., but without the 

 denticle in front of the apex of the right valve. 



C. Tasmanica inhabits the south-east coats of Tasmania and St. 

 Vincent-Gulf, South Australia. 



Cuspidaria simulans, Tate, 1897. 

 Oblong-oval, somewhat ventricose, white, thin, translucent, 

 concentrically and distantly Urate; line usually rounded and 

 elevated, becoming somewhat lamellose anteriorly, sometimes as 

 close-set and slightly elevated lamellae. Some examples show 

 distant radial pellucid lines. The rostrum is elongated, about 

 one-fifth of the total antero-posterior diameter, attenuated and 

 truncate. 



