270 174 



Corbula sulcata, Lam. 



Corhnla sulcata, Lamahck, Systeme d. anim. s. vert., 1801, p. 137. — Hist. nat. d. aniiii. s. vert., V, 1818, 

 p. 495, No. 2. — éd. 2, VI, p. 138, No. 2. 



— — — Encyclop. method. Hist. nat. d. vers, II, 2, 1830, p. 8, No. 1. — Tableau encycl. 



et méth. Moll, test., pi. 230, fig. 1. 



— — — Hanley, Catal. of rec. bivalve shells, p. 45, pi. 13, fig. 48. 



— — — Reeve, Conchol. icon., II, 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 + ^2/3). Between Koh Kut 

 and Koh Kahdat, 10 fathoms, shells (i^/s). Koh Kahdat ('/s). 



Long. 5 — 14 mm. (alt. 125 mm., long. 14 mm.). 



Distribution:— Lamarck records: l'Océan indien? Hanley and Reeve: 

 Senegal. Rochebrune: Porto-Praya (Rang). 



Corbiila fortisnlcata. Smith, is very closely allied to the present species. In 

 the British Museum there is a specimen labelled "Corbiila fortisnlcata, 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 transitional forms between them and the typical C. sulcata. Lam. 



Corbula monilis, Hinds. 



(PI. V, Figs. 27-30). 



Corbula monilis, Hinds, Proe. Zool. Soc. London, XI, 1843, p. 58. 



— — — Reeve, Conchol. icon., II, Corbula, Sp. 35. 



— — — Edg. Smith, Laraellibranchiata of the Challenger Expedit., p. 34. 



— — — HiDAi.GO, 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. 1'5 — 3 mm. 



Distribution: — Singapore (2 — 3 fathoms, coral reef, Sv. Gad). — Philippines, 

 Torres Strait, Mast Head Reef (Queensland), 



Corbula solidula, Hinds. 



(PL V, Figs.31-34 and 42-44!. 



Corbula solidula, Hinds, Proe. Zool. Soc. London, XI, 1843, p. 58. 



— — — Reeve, Conchol. icon., II, Corbula, Sp. 41. 



— - - Mollusca of the voyage of H. M. S. "Sulphur," 1845, p. (ii). No. 288. 



— — — Hidalgo, Fauna malacol. de 1. isl. Filipinas, II, 1903, p. 34, No. 66. 



— ebnrnea, — Proe. Zool. Soc. London, XI, 1843, p. 58. 



— — — Reeve, Conchol. icon.. II, Corbula, Sp. 42. 



— — — Mollusca of the voyage of H. M. S. "Sulphur," 1845, p. (i'J, No. 2!I0, pi. 20, fig. 14. 



— — — Hidalgo, Fauna malacol. de 1. isl. Filipinas, II, 1903, p. 34, No. 07. 



Many specimens taken in 26 different localities between Koh si Chang and 

 Koh Kut, 1—30 fathoms, mud, sand, shells and clay. 

 Long. 2 — 45 mm. 



