270 174 
Corbula sulcata, Lam. 
Corbula sulcata, LAMARcK, Systéme d. anim. s. vert., 1801, p. 137. — Hist. nat. d. anim. s. vert., V, 1818, 
p. 495, No.2. — éd. 2, VI, p. 138, No. 2. 
— - - Encyclop. méthod. Hist. nat. d. vers, II, 2, 1830, p. 8, No.1. — Tableau encyel. 
et méth. Moll. test., pl. 230, fig. 1. 
— — Haney, Catal. of rec. bivalve shells, p. 45, pl. 13, fig. 48. 
Reeve, Conchol. icon., Il, Corbula, Sp. 2. 
NW. of Koh si Chang, 10 fathoms, mud (1). North of Koh Kut, 10 fathoms, 
mud (#%/2). W. of Koh Kut, 10—15 fathoms, mud (1 + */2). Between Koh Kut 
and Koh Kahdat, 10 fathoms, shells (17/2). Koh Kahdat (‘/2). 
Long. 5—14 mm. (alt. 125 mm., long. 14 mm.). 
Distribution: — Lamarck records: ?Océan indien? Hanrey and REEVE: 
Senegal. RocHEBRUNE: Porto-Praya (RANG). 
Corbula fortisulcata, Smith, is very closely allied to the present species. In 
the British Museum there is a specimen labelled “Corbula fortisulcata, Smith var.”* 
from “Jack’s Island, South Sea,” which agrees completely with some of the specimens 
from the Gulf of Siam, and these cannot possibly be separated from C., sulcata, as 
there are evenly transitiona! forms between them and the typical C. sulcata, Lam. 
Corbula monilis, Hinds. 
(Pl. V, Figs. 37—30). 
Corbula monilis, Hinps, Proc. Zool. Soc. London, XI, 1843, p. 58. 
— - —— Reeve, Conchol. icon., Il, Corbula, Sp. 35. 
— - — Epa. Smiru, Lamellibranchiata of the Challenger Expedit., p. 34. 
-- — — Hipaico, Fauna malacol. de 1. isl. Filipinas, II, p. 33, No. 64. 
Many specimens taken in 19 different localities between Koh Kram and Koh 
Kut, 1—30 fathoms, sand, mud and shells. 
Long. 15—3 mm. 
Distribution: — Singapore (2—3 fathoms, coral reef, Sv. Gap). — Philippines, 
Torres Strait, Mast Head Reef (Queensland), 
Corbula solidula, Hinds. 
(Pl. V, Figs. 31—34 and 42—44). 
Corbula solidula, Hinvs, Proc. Zool. Soc. London, XI, 1848, p. 58. 
Reeve, Conchol. icon., Il, Corbula, Sp. 41. 
= — - Mollusca of the voyage of H. M.S. “Sulphur,” 1845, p. 69, No. 288. 
— —~  Htpaico, Fauna malacol. de 1. isl. Filipinas, II, 1903, p. 34, No. 66. 
— eburnea, -- Proc. Zool. Soc. London, XI, 18438, p. 58. 
- Reeve, Conchol. icon., Il, Corbula, Sp. 42. 
Mollusca of the voyage of H.M.S. “Sulphur,” 1845, p. 69, No. 290, pl. 20, fig. 14. 
= —  Hipareo, Fauna malacol. de |. isl. Filipinas, I, 1903, p. 34, No. 67. 
Many specimens taken in 26 different localities between Koh si Chang and 
Koh Kut, 1—30 fathoms, mud, sand, shells and clay. 
Long. 2—4'5 mm. 
