208 



1854. Mactra Reevei Deshayes, Proc. Zool. Soc. London (vol. for 1853) p. 15. 



1854. Mactra maculata and M. Reevei Reeve, Conch. Icon., VIII, Mactra, pi. XII, fig. 56, 



pi. XVI, fig. 85. 

 1856. Trigonella inacjilata Adams, H. & A., Gen. Rec. MolL, II, p. 376. 

 1858. Mactra Reevei Fischer, P., Journ. Conchyliol., VII, p. 334. 

 1860. Mactra niaculata and M. Reevei Reeve, Elem. Conch., II, p. 144. 



1868. Trigonella maculata Conrad, Amer. Journ. Conch., III, p. 38. 



1869. Trigonella maculata Frauenfeld, Verhandl. Zool. -Bot. Ges. Wien, XIX, p. 879. 



1869. Mactra Reevei Dunker, Cat. Mus. Godeffroy, IV, p. 108. 



1870. Mactra maculata Môrch, Malakozool. Blàtt., XVII, p. 123. 



1880. Mactra maculata Weinkauff in Mart.-Chemn., Conch.-Cab. (N. F.), XI, (2), Mactra,^. 10, 



pi. III, figs. 4, 5. 



1881. Mactra Reevei Weinkauff, op. cit., p. Ç)6, pi. XXIII, fig. 4, 4a. 

 1884. Mactra maculata and M. Reevei Grasset, Ind. Test. Viv., p. 248. 



1889. Mactra Reevei Morlet, Journ. Conchyliol., XXXVII, p. 172. 



1890. Mactra maculata and M. Reevei Paetel,- Cat. Conch. Samm., III, p. 32. 



1891. Mactra Reevei Fischer, P., Bull. Soc. Hist. Nat. d'Autun, IV, p. 243. 

 1896. Mactra maculata Casto de Elera, Cat. Sist. Filip., p. 725. 



1903. Mactra maculata Hidalgo, Obras Malacol., II, p. 48. 



1905. Mactra maculata Hidalgo, Cat. Filip., p. 300. 



1906. Mactra maculata Ovvston, Japan. Loochooan shells, p. 38. 



1906. Mactra maculata Hedley, Proc. Linn. Soc. N. S. Wales, XXXI, p. 467. 



1909. Mactra maculata Hedley, Austral. Ass. Adv. Sci., XII, p. 351. 



1909. Mactra [Trigonella) maculata Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Math. Nat., 



(7) V, pp. 220. 

 1914. Mactra maculata and M. squalida Lamy, Bull. Mus. d'Hist. Nat. Paris, XX, pp. 134, 243. 

 1914. Mactra maculata Smith, Proc. Malacol. Soc. London, XI, p. 143. 

 19 17. Mactra maculata Lamy, Journ. Conchyliol., LXIII, p. 216. 

 1924. Mactra maculata and M. reevei Tomlin, Journ. Conch., XVII, p. 135. 



As Lamy remarked, M. squalida Lam. and M. setosa Quoy & Gaimard are synonymous 

 w^ith M. maculata, while M. reevei also has been shov^n by Smith, Lynge and other authors to 

 be based on shells of the same species. Lamy has given a good description of the distinguishingf 

 characters of M. maculata. 



Distribution : — M. {M.) maculata is viridely distributed in the Indo-Pacific Région. 



The "Siboga" Expédition collected a single shell at Pulu Sanguisiapo, Tawi Tawi Islands, 

 Sulu Archipelago (St. 93). This shell is quite typical except that it is rather thinner than normal 

 spécimens of the species. 



2. Mactra {Mactra) arte^isis Fischer. 



1858. Mactra artensis Fischer, P., Journ. Conchyliol., VII, p. 334. 



1860. Mactra artensis Montrouzier, Journ. Conchyliol., VIII, p. iii, pi. II, fig. i. 



1868. Trigonella Artensis Weinkauff in Martini-Chemn., Conch.-Cab. (N. F.), XI, (2), Mactra, 



p. 79, pi. XXVII, fig. 3. 

 1890. Trigonella Artensis Paetel, Cat. Conch. Samm., III, p. 30. 

 1917. Mactra [Mactra] artensis Lamy, Journ. Conchyliol., LXIII, p. 215. 



This small-sized, almost triangular oval species has very characteristic reddish to yellowish 

 brown stripes under a yellowish epidermis, and the nacre is of a shining rose red colour 

 intersepted by whitish radial stripes ; the outer margin is pure white. In young shells the radial 

 stripes are not so well marked, and the nacre is also of a more brownish yellow colour. 



