2 lO 



1837. Spisiila tenera Gray, Mag. Nat. Hist., I, p. 373. 



1843. Mactra Aspersa Hanley, Rec. Biv. Shells, p. 33. 



1845. Mactra aspersa Catlow & Reeve, Conch. Nomencl., p. 13. 



1854. Mactra aspersa and M. egena Reeve, Conch. Icon., VIII, Mactra, pi. XIV, figs. 65, 71. 



1855. Mactra Egena Deshayes, Proc. Zool. Soc. London (vol. for 1854), p. 68. 



1856. Mactrhmla Egena and Spisula aspersa Adams, H. & A., Gen. Rec. Moll., II, pp. 376, 378. 

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



1860. Mactra aspersa and M. egena Reeve, Elem. Conch., II, p. 144. 



1868. Heminiactra aspera (sic) and Mactrimda egena Conrad, Amer. Journ. Conch., III, p. 32, 34, 



1882. Mactra egena and M. aspersa Weinkauff in Martini-Chemn., Conch.-Cab. (N. F.), XI (2). 



Mactra, p. 76, pi. XXVI, figs. 4, 4«, p. ']'], pi. XXVI, fig. 5. 

 i8go. Mactrinnla egena and Heminiactra aspersa Paetel, Cat. Conch. Samm., III, pp. 33, 34. 

 1896. Mactra [Heminiactra) aspersa Melvill & Standen, Journ. Linn. Soc. London (Zool.), 



XXVII, p. 198. 

 1903. Mactra {Heminiactra) aspersa Hidalgo, Obras MalacoL, II, p. 49. 



1905. Mactra aspersa Hidalgo, Cat. Filip., p. 299. 



1906. ? Mactra aspersa Dautzenberg & Fischer, H., Camp. Sci. Prince de Monaco, Fasc. XXXII, 



p. 89, pi. V, figs. 8 — 10. 

 1909. RIactra aspersa Hedley, Austral. Ass. Adv. Sci., XII, p. 351. 

 1914. Mactra [Mactrinula) aspersa Smith, Proc. Malacol. Soc. London, XI, p. 140. 

 19 17. Mactra [Mactrotoma] aspersa Lamy, Journ. Conchyliol., LXIII, p. 257. 

 1924. Mactra egena Tomlin, Journ. Conch., XVII, p. 135. 

 1928. Mactra aspersa Faustino, Summary Philippine Mar. Freshw. Moll., p. 108. 



The shells recorded under the name Mactra aspersa by Dautzenberg and Fischer from 

 the West coast of Africa hâve, as remarked by Lamy, fewer epidermal colour markingfs and 

 the sculpture "à peine plus fine", and it may probably be right to separate thèse under the 

 name M. egena Sowerby. 



The spécimens in the "Siboga" collection which I refer to this species, are ail young 

 shells, not exceeding 26.5 mm. in length. The shell is thin, there are faint dark brownish 

 blotches ail over the shells, and the sculpture consists of even, low, concentric striae. 



Distribution : — M. aspersa was described from the Philippine Islands, and has also been 

 recorded from the Australian waters. M. egena was described from spécimens of unknown habitat. 



The "Siboga" shells of this species were collected at St. 98 (6°9'N., i20°2i'E., 

 350 mètres) and Anchorage off North Ubian (St. 99). 



6. Mactra {Mactrinula^ dolabrata Reeve. (Plate VI, figs, 3, 4). 



1854. Mactra dolabrata Reeve, Conch. Icon., VIII, Mactra, pi. XIX, fig. 107. 



1855. Mactra dolabrata Deshayes, Proc. Zool. Soc. London (vol. for 1854), p. 66. 



1856. Mactrinula dolabrata Adams, H. & A., Gen. Rec. Moll., II, p. 377. 

 1860. Alactra dolabrata Reeve, Elem. Conch., II, p. 144. 



1868. Mactrinula dolabrata Conrad, Amer. Journ. Conch., III, p. 34. 



1884. Mactra dolabrata Weinkaufif in Martini-Chemn., Conch.-Cab. (N. F.), XI (2), Mactra, 



p. 93, pi. XXXI, fig. 5. 

 1890. Mactrinula dolabrata Paetel, Cat. Conch. Samm., III, p. 33. 

 1917. Mactra dolabrata Lamy, Journ. Conchyliol., LXIII, p. 275. 

 1924. Mactra dolabrata Tomlin, Journ. Conch., XVII, p. 135. 



A single shell in the "Siboga" collection agrées with Reeve's type of M. (M.) dolabrata. 

 The shell is comparatively thin and concentrically striated with very fine, almost microscopic 



