222 126 



1868, p. 24, No. 344) records M. Liizonica, Desli., from Porl Jackson and Botany Hay, 

 bill Edg. Smith ' thinks that the specimens from these locahties are identical with 

 M. piisilla, A. Ad. 



Mactra (Mactrinula) angulifera, Desh. 



Mactra angulifera, Deshayes, Proc. Zool. Soc. London, XXII, 1854, p. 70, No. 37. 



— — — Reeve, Conchol. icon., VIII, Mactra, Sp. 83. 



— — — Weinkauff in Martini u. Chemnitz, Conchji. Cabin., XI lîd., 2 Abtli., p. 83, 



No. 87, pi. 28, fig. 5. 

 Mactrinula — — Edü. Smith in Rep. Zool. Collect made during the Voyage of H. M. S. "Alert,' 



1884, p. 101. 

 ~ — — Hidalgo, Fauna malacol. de I. isl. Filipin.. II, p 56, No. 115. 



Mactra ovalina non Lamarck\ Reeve, Concliol. icon., VIII, Mactra, Sp. 66. 



South of Koh Chuen, 30 fathoms, shells ('/s). North of Koh Kahdat, 4—5 

 fathoms, coarse sand (1). West of Koh Kut, 30 fathoms, sand and mud (^'/a). 



Long. 7 — 31 mm. 



Distribution: — Singapore (shallow water, Sv. Gad), Mergui Archip. (E.v. 

 Martens), Persian Gulf (E. v. Martens). — Philippines (Cuming). 



Edg. Smith " is of opinion that M. angulifera, Desh., is not specifically distinct 

 from M. depressa, Spengler (Reeve), but in this he is probably mistaken. I have on 

 PI. IV, Figs. 20—23 given figures of M. depressa, Spgl., drawn from Spengler's 

 original specimens in the Zoological Museum of the University of Copenhagen. 

 On comparing these figures with Reeve's figure of M. angulifera, Desh., one can soon 

 be convinced that they are two distinct species (the valves of M. depressa are much 

 thicker and more solid than those of M. angulifera). Reeve's description and figure 

 of Spengler's depressa (Sp. 67) agree well with the original specimen. It is quite 

 natural that Edg. Smith should doubt whether Reeve has correctly apprehended 

 Spengler's form, as Spengler's description is not good, and his statement that 

 Guinea is the locality is undoubtedly wrong. M. ovalina, Lam., has been greatly 

 misapprehended by various authors; Weinkauff ■* records it (= falcata, Gould) from 

 Puget Sound; Tate and May^ record it (^ depressa, Reeve) from Tasmania; G. B. 

 SowERBY' records it (= depressa, Spgl.) from Durban in South Africa; d'Orbigny'' 

 (= M. fragilis, Ch.) from Cuba, Brazil, and Patagonia; etc. It is fairly certain that 

 these authors have had quite dilTerent species for investigation. 



' Report on the Lamellibranchiata of the Challenger Expedition, p. 61. 



'' Report on the Lamellibranchiata of the Challenger PLxpedition. p. 57. 



3 Martini u. Chkmnitz, Conchyl. Cabin., XI I5d., 2 Abth., p. 69, No. 70. 



■• Proc. Linnean Society of New South Wales, 1901, p. 423. 



^ Marine Shells of South Africa, Appendix, 1897, p. 22. Edü. Smith also records it (Journ. of Malaco- 

 logy, 1904, p. 25) from Port Alfred, Cape Colonj'. 



•^ Mollusques de l'île de Cuba, 1853, II, p 222. List of the Shells of South America in the collect, 

 of the British Museum, 1854, p. 56, No. 489. 



