686 STUDIES ON AUSTRALIAN MOLLUSCA, xiii., 



to view, and that the later Australian references to it should be 

 transferred to C. rackettii Donovan. 



Cardium cygnorum Deshayes. 

 (Plate lii., fig.41.) 



Cardium cygnorum Deshayes, Proc. Zool. Soc, 1854 (May, 

 1855), p.331; Id., Angas, op. cit., 1865, p. 651; Id., Tryon, Am. 

 Journ. Conch., vii., 1872, iSuppl., p. 261; Id., Tenison-Woods, 

 Proc. Roy Soc. Tasm., 1877, p.53; Id., Tate, Trans. Roy. t:>oc. 

 S.A., ix., 1887, p.95; Id., Tate &, May, Proc. Linn. Soc. N. S. 

 Wales, xxvi., 1901, p.430; Id., Pritchard *t Gatliff, Proc. Boy. 

 Soc. Vict., xvi., 1903, p.l35. 



Though this species has been frequently cited in literature, it 

 has not yet been figured. A specimen 50 mm. high and 42 mm. 

 long, from St. Vincent's Gulf, S. Australia, identified by Mr. E. 

 A. Smith, is, therefore, here illustrated. The range of this 

 species is now announced to extend into New South Wales. I 

 have dredged a living specimen, 26 x 28 mm., in 7-10 fathoms, 

 on sandy ground, under Montagu Island. 



Tridacna gigantea Perry. 



Chama gigas Linne (in part only) Syst. Nat., x., 1758, p. 691 

 Cfide Hanley, Ips. Linn. Conch., 1855, p. 85); Id., P»orn, Test. 

 Mus. Cfes., 1780, p.80; Id., Chemnitz, Conch. Cab., vii., 1784, 

 p. Ill, PI. 49, 'figs. 492-4. "Zrti^at^'itVe,"Cubieres, Histoire Abrege 

 des Coquillages de Mer, 1798, p.l48. Chania gigantea Perry, 

 Concholog}'^, 1811, p.2. Chama gigas Flinders, Voy. Terr. Austr., 

 ii., 1814, p. 114. Tridacna gigas Lamarck, An. s. vert., vi., 1819, 

 p. 105; Id., Ten. -Woods, these Proceedings, v., 1880, p. 125; Id., 

 Kobelt, Nachr. deut. Malak. Gesell., xv., 1883, p. 189; Id., Kent, 

 Great Barrier Heef, 1893, p. 44, PL xxix.; Id., Smith, Proc. Malac. 

 Soc. iii., 1898, p.ll2; Id., Hedley, Nautilus, xv., 1902, p.98; Id., 

 Banfield, "Confessions of a Beachcomber," 1908, p. 138. Tridacna 

 lamarcki Hidalgo, Mem. Real Acad. Cienc. Madrid, xxi., 1903, 

 p.385. 



Under the name of Chania gigas, the Father of Natural His- 

 tory seems to have embraced the whole of the modern genus 



