1868, p. 24, No. 344) records M. Luzonica, Desh., from Port Jackson and Botany Bay, 
but Epc. Smiru! thinks that the specimens from these localities are identical with 
M. pusilla, A. Ad. 
Mactra (Mactrinula) angulifera, Desh. 
Mactra angulifera, DesHayEs, Proc. Zool. Soc. London, XXII, 1854, p. 70, No. 37. 
-— — - ReEEvE, Conchol. icon., VII, Mactra, Sp. 83. 
— — WernkavurF in Martini u. CHEMNITZ, Conchyl. Cabin., XI Bd., 2 Abth., p. 83, 
No. 87, pl. 28, fig. 5. 
Mactrinula — — Epa. SmirH in Rep. Zool. Collect. made during the Voyage of H. M.S. ‘Alert,’ 
1884, p. 101. 
= — — HripaLGo, Fauna malacol. de 1. isi. Filipin.. Il, p. 56, No. 115. 
Mactra ovalina (non LAMARCK), REEVE, Conchol. icon., VIII, Mactra, Sp. 66. 
South of Koh Chuen, 80 fathoms, shells (‘/2). North of Koh Kahdat, 4—5 
fathoms, coarse sand (1). West of Koh Kut, 30 fathoms, sand and mud (°*/:). 
Long. 7—31 mm. 
Distribution: — Singapore (shallow water, Sv. Gap), Mergui Archip. (E. v. 
Martens), Persian Gulf (E. v. Manrens). — Philippines (Cumine). 
Epa. Situ? is of opinion that M. angulifera, Desh., is not specifically distinet 
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). Rrerve’s description and figure 
of SPENGLER’s depressa (Sp. 67) agree well with the original specimen. It is quite 
natural that Epc. Smirn 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. WM. ovalina, Lam., has been greatly 
misapprehended by various authors; WeEINKAUFF® records it (= falcata, Gould) from 
Puget Sound; Tarr and May? record it (= depressa, Reeve) from Tasmania; G. B. 
Sowerby” records it (= depressa, Spgl.) from Durban in South Africa; p’OrsrGNy " 
(= M. fragilis, Ch.) from Cuba, Brazil, and Patagonia; ete. It is fairly certain that 
these authors have had quite different species for investigation. 
1 Report on the Lamellibranchiata of the Challenger Expedition, p. 61. 
* Report on the Lamellibranchiata of the Challenger Expedition, p. 57. 
8 Martini u. CHeMNiTz, Conchyl. Cabin., XI Bd., 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. Epc. Smiru also records it (Journ. of Malaco- 
logy, 1904, p.25) from Port Alfred, Cape Colony. 
5 Mollusques de Vile de Cuba, 1853, Il, p. 222. List of the Shells of South America in the collect. 
of the British Museum, 1854, p. 56, No. 489. 
