262 Proceedings of the Royal Society of Victoria. 



1843. Pecten laticostatus, Gray (non Lamarck), in Dief- 



fenbach's New Zealand, vol. ii., p. 260. 

 1852. Pecten fumatus, Keeve. Conch. Icon., vol. viii., 



pi. 7, f. 32. 

 1852. Pecten novaezelandiae. Reeve. Id., pi. 8, f. 36. 

 1852. Pecten filosus, Reeve. Id., pi. 11, f. 42. 

 1852. Pecten mediuB, Reeve. Id., pi. 11, f. 44. 

 1856. Pecten laticostatus, Hanley (non Lamarck). Cat. 



Rec. Biv. Shells, p. 287. 

 1865. Vola laticostata, Ang^as. P.Z.S. Lend., p. 656, 



No. 90. 

 1867. Vola fumata, Angas. P.Z.S. Lond., p. 933, No. 



129. 

 1880. Pecten laticostatus, Huttnn (non Lamarck). Man. 



N.Z., Moll., p. 171. 

 1885. Pecten (Janira) fumatus, E. A. Smith. Chall. 



ZooL, vol. xiii., Lamelli, p. 307. 

 1887. Pecten meridionalis, Tate. P.R.S. Tas., p. 114. 

 1887. Pecten fumatus, var albus, Tate. Id., p. 113. 

 1902. Pecten medius, Hedley. Mem. Austr. Mus., vol. 

 iv., pt. 5, pp. 303, 304. 

 Hab. — Common on weedy banks. Port Phillip and Western 

 Port. Gippsland coast. 



Obs. — Pecten bifidus (Menke, Moll. Nov. HolL, p. 35) we have 

 omitted fi'om the above, as we believe that it falls in with P. 

 modestus, Reeve, which on the material at present available 

 to us. we retain as a distinct species. Hanley as far back as 

 1856, in his Catalogue of Recent Bivalve Shells, page 287, sug- 

 gests that P. laticostatus. Gray, P. bifidus, and P. medius are 

 one and the same, for he states, " P. laticostatus. Gray, is the 

 bifidus of Phillippins Conchylien, and judging from tlie descrip- 

 tion of Deshayes in the third vol. of the Encyc. Methodique, 

 the medius of Lamarck." G. F. Angas also has remarked on 

 the close alliance between Pecten laticostatus, Gray,, and P. 

 medius, Lamarck, in his reference, which we quote above. 

 Perry's P. concavum (Conchology, pi. 55, f. 1), may proVjably re- 

 present this species, in which case his name has priority, but his 

 specimen is recorded as from the Red Sea, and his figure is too 

 unsatisfactory for definite determination. 



