SMITH : ON AUSTRALIAN MACTKID.T;. 147 



very similar, but the lateral teeth of the American shell are not 

 striated, and the pallial sinus is narrower and deeper. 



The true 31. rostrata of Spengler ' is altogether a different species, 

 2-J inches long, and said to have come from the coast of Guinea. 



29, Mactra (Spisula) pinguis, Crosse & Fischer. B.M. 



Mactra pinguis, Crosse «& Fischer, Journ. de Conch., vol. xii, p. 349 ; 



vol. xiii, p. 427, pi. xi, fig. 2 ; Weinkauff, ]>. 80, pi. xxvii, 



figs. 5,5a; Smith, Journ. Linn. Soc, vol. xii, p. 562, pi. xxx, 



fig. 25, 1876. 

 Mulinia pinguis, Augas, Proc. Zool. Soc, 1865, p. 645. 

 Mactra {Mulinia) pinguis, Tate, Trans. Itoy. Soc. S. Australia, vol. ix, 



p. 84. 

 Hab. — Port Lincoln (Angas), South Australia (Weinkauff), 

 Tasmania (J. Brazier in Brit. Mus.). 



30. Mactra (Mactrinula) plicataria, Linne. B.M. 



Mactra plicataria, Linne, lleeve, fig. 26 ; Weinkauff, p. 7, pi. ii, figs. 



4-6. 

 M. {Mactrinula) plicataria, Sinitli, Challenger Laraellibranchiata, 

 p. 57. 

 Hah. — Cape York, North Australia ( Challenger), Java, Sumatra, 

 Tranquebar, off the Gangetic Delta (Brit. Mus.), Queensland 

 (Hedley). 



I still have some doubt with regard to the identification of tlie 

 Challenger specimen, only about half an inch in length. 



31. Mactra puka, Deshayes. B.M. 



Mactra pur a, Deshayes, Proc. Zool. Soc, 1853, p. 15 ; Reeve, pi. xii, 



fig. 53 ; Weinkauff, p. 26, pi. ix, figs. 1, \a. 

 Trigonella pura, Angas, Proc. Zool. Soc, 1865, p. 645. 

 M. virgo, Deshayes, op. cit., 1854, p. 66 ; Reeve, fig. 62 ; Weinkauff, 

 p. 91, pi. xxxi, fig. 2 (copy of Reeve). 



Rah. — Australia (Deshayes), Spencer's Gulf, Hardwick Bay, South 

 Australia (Angas), Green Island, off Cairns, Queensland (Hedley), 

 West Australia and Adelaide (Brit. Mus.), Swan River (Deshayes for 

 rirgo), St. Vincent and Spencer Gulfs, Fowler Bay, Head of the Great 

 Bight, and Eucla. Also King George Sound and Tasmania (Tate). 



M. virgo, founded on a single shell in the Cuming Collection, differs 

 only from the type of M. pura in being a little more acuminate at the 

 hinder end. This I regard merely as an individual variation. The 

 external sculpture, character of the hinge, and the pallial sinus are 

 exactly similar. 



M. australis, Sowerby, from Swan River, has been referred to the 

 present species by some authors. Judging by the figure (Zool. 

 Beechey's Voy., pi. xlix, fig. 6), the anterior end is too acute. I must 



' Skrivt. Naturhist.-Selsk., vol. v, Heft ii, p. 115, 1802. 



