236 Proceedings: of the Roycd Society of Victoria. 



1843. Tripronia pectinata. Haiiley. Cat. Kec. Biv. Shells, 

 p. 172. 



1849. Trigonia margaritacea, Huxley. P.Z.S. Lond., p. 



31, pi. 3, f. 1-3. 



1850. Trigonia margaritacea, Huxley. A.M.N. H., vol. 



v., p. 141. 

 1858. Trigonia margaritacea. H. and A. Adams. Genera, 



pi. 124, f. 1-lb. 

 18G0. Trigonia margaritacea. Reeve. Conch. Icon., vol. 



xii., pi. 1, f. 3a-3d. 

 1875. Trigonia pectinata, Woodward. Man. Moll., pp. 



25 and 430, figs. 18 and 221. 

 1878. Trigonia margaritacea, .^ngas. P.Z.S. Lond., p. 



871. 



1884. Trigonia dubia, Sowerby. Thes. Conch., vol. v., 



p. 188, pi. 492, f. '5. 



1885. Trigonia margaritacea, E. A. Smith. Chall. Zool., 



vol. xiii., p. 224. 

 1887. Trigonia margaritacea, Tate. T.R.S. S.A., vol. ix., 

 p. 101, No. 124. 



1901. Trigonia margaritacea., Hall. P.R.S., n.s., vol. 



xiv., ])t. 1. p. 17, figure in text. 



1902. Trigonia margaritacea, Hedlej^ Mem. Austr. 



Mus., vol. iv., pt. 5, pp. 301, 302. 



Hab. — Westei-n Port, dredged from 5 to 7 fathoms off Rhyll ; 

 Port Phillip, off Portsea ; off East Moncoeur Island, Bass Strait, 

 38 fathoms sand and shells (Challenger). 



Obs. — A slight variation of this species has been erroneously 

 identified by the late Sir F. McCoy as identical with his fossil 

 species T. acuticostata, originally referred to as from the Older 

 Pliocene Beds of Mordialloc. Fortunately, the living specimens 

 upon which McCoy's determinations were made, have been pre- 

 sei'ved in the National Museum, and a close comparison has 

 been made between them and the living T. margaritacea on the 

 one hand, and the Miocene or Kalimnan fossil originally de- 

 scribed under the name of T. acuticostata on the other, and 

 there can be no doubt whatever, that a misidentification has 

 been made by McCoy as to the recent species, while the 

 fossil form is quite a distinct species. McCoy's name of T. 



