BY C. HEDLEY. 747 



var. {gamma)* For this yellow-mouthed form, as developed on 

 the rocks at the south head of Wineglass Bay, Tasmania, I now 

 propose the varietal name of aurea. 



Thais distinguenda Dunker & Zelebor. 



Purpura hippocastaneum var., Quoy & Gaimard, Zool. Astro- 

 labe, 1834, Moll., PI. 38, figs.1,3; Id., Kiener, 1836, Pourpre 

 Armigeres, PI. xiii., fig. 36; Id., Reeve, Coneh. Icon., vii., 184G, 

 PI. viii., fig.36«. P. distinguenda Dunker & Zelebor, Verh. Zool.- 

 bot. Gesell. Wien, 1866, p.910; Id., Frauenfeld, Novara Exped., 

 Moll., 1867, p.5, PI. i., fig.3; Id., Schmeltz, Mus. Godeff. Cat., v., 

 1874, p.l22; Id., Pease, Amer. Journ. Conch., vii., 1872, p.23; 

 Id., Martens in Mobius, Mauritius, 1880, p. 234. 



Though repeatedly figured, this form was not distinguished 

 from the hippocastaneum medley until the time of the Novara 

 Expedition. Under the heading of P. stellata Bolten, it was 

 reported from Port Denison by Schmeltz. But D'Argenville's 

 figure, PI. 17, fig.H, on which Bolten founded P. stellata (Mus. 

 Bolt., 1798, p. 54), is too obscure for determination, and, in par- 

 ticular, does not agree with the proportions of T. distinguenda. 



I have taken this species at Murray Island, Torres Straits, 

 whence it ranges south along the Queensland coast. 

 Thais kienerii Deshayes. 



Purpura kienerii Deshayes, Anim. s. vert., x., 1844, p. 101, for 

 Kiener, Pur'pura, PI. xi., fig.32; Purpura biserialis Schmeltz, 

 Cat. Mus. Godeff., v., 1874, p.l23; P. bituberctdaris var., Smith, 

 Zool. Alert, 1^84, p.50; P. alveolata Melvill & Standen, Journ. 

 Linn. Soc. Zool., xxvii., 1899, p. 162. 



Schmeltz records this from Port Denison. Coppinger found 

 it at Port Molle, and I have taken it at Gatcombe Head. It 

 closely resembles T. pica, but may be easily distinguished by the 

 throat, which is smooth, where T. pica has raised, coloured, 

 revolving threads. 



Thais pica Blainville. 

 Purpura pica Blainville, Nouv. Ann. Mus., i., 1832, PI. 9, fig. 9; 

 Id., Reeve, Conch. Icon., vii., PI. viii., fig. 36. 



* Cro.s?e, Journ. de Coiieh., xiii., 1865, p. 50. 



