692 STUDIES ON AUSTRALIAN MOLLUSCA, xiii., 



This has a general likeness to T. penia, for which it has been 

 mistaken, but T. astula has a much narrower rostrum, and an 

 abrupt notch where the rostrum leaves the body. T. pharaonis 

 has the rostrum grooved, but both the rostrum and the rest of 

 the valve are longer and narrower than in 2\ astula. T. con- 

 saiiguinea Sowerby,* is more compressed, and the rostrum has a 

 more upward direction. 



Spisula trigonella Lamarck. 



Mactra trigonella Lamarck, An. s. vert., v., 1818, p. 479; Id., 

 Lamy, Bull Mus. Hist. Nat., 1914, p. 245. Gnathodon parvum 

 Petit, Journ. de Conch., iv., 1853, p. 358, PI. xiii., figs. 9, 10. 

 Spisula parva Dall, Proc. U. S. Nat. Mus., xvii., 1894, p. 106 ; 

 Id., Hedley, Proc. Linn. Soc, N. S. Wales, xxvi., 1902, p 707, 

 PI. xxxiv., figs. 2, 3 (hinge); Id., Smith, Proc. Malac. Soc, xi., 

 1914, p.l46. 



Mactra trigonella was gathered by Peron at Shark's Bay, W.A., 

 and was named by Lamarck. For nearly a century, his unfigured 

 type has lain unobserved in the Paris Museum. Dr. Lamy has 

 lately disinterred it, and declares it identical with Spisula parva, 

 which younger name must now be superseded. 



Amphidesma angusta Reeve. 

 (Plate xlvi., fig.4.) 

 Mesodesma angiista Pteeve, Conch. Icon., viii., July 1854, PI. i., 

 fig.S; Id., Deshayes, Proc. Zool. Soc, 1854 (May, 1855), p.338; 

 Id., Tate, Trans. Hoy. Soc. S.A., xxi., 1897, p. 46; Id., Lamy, 

 Journ. de Conch., Ixii., 1914, pp.37, 38, fig.2. Mesodesma 

 elongata Reeve, Conch. Icon., viii., 1854, PI. i., tig. 5; Id., Des- 

 hayes, Proc. Zool. Soc, 1854 (1855), p. 337; Id., Tate, Trans. 

 Roy. Soc. S.A., ix., 1887, p. 85; Id., Tate k May, these Proceed- 

 ings, xxvi., 1901, p.424; Id., Pritchard & Gatliff, Proc. Roy. Soc. 

 Vict., xvi., 1903, p. 110. Donacilla elongata Angas, Proc. Zool. 

 Soc, 1865, p.647, and 1867, p. 220; Id., Tryon, Am. Journ. 

 Conch., iv., Suppl., 1868, p.l26; Id., Ten.-Woods, Proc Roy. 

 Soc. Tasm., 1877, p.50. 



Sowerby, Ann. Mag. Nat. Hist., (7), xii., 1903, p.500. 



