39 135 
Brachyodontes emarginatus, Bens. (Reeve). 
Modiola emarginatus, BENson, M. S. in Mus. Cuming. 
— — — Reeve, Conchol. icon., X, Modiola, Sp. 60, pl. X, fig. 73. 
Perna emarginata, = RocHEBRUNE, Faune malacol. de la Cochinchine et du Cambodge, Suppl., 
Bullet. de la Soc. philomath. de Paris, !°/12 1881, (Repr.) p. 4, No. 17. 
Modiola — — P. Fiscuer, Catal. d. Moll. de l’'Indo-Chine, p. 212. 
— — — Martini u. CHemnitz, Conchyl. Cabin., VIII, 3 Abth., p. 114, pl. 26, fig. 3 
(according to v. MARTENS not p. 120, pl. 25, figs. 7—8, these probably being 
M. Fortunei, Reeve). 
_ — — v. MarTENs, Siiss- u. Brackwasser Moll. d. Ind. Archipels, 1897, p. 227. 
Koh Kahdat, 1—5 fathoms, sand (3). Strand of Koh Kahdat (fragments). 
Long. 25 mm. 
Distribution: — The coast of Birma, in brackish water (BLANFORD), Bom- 
bay (MELvitL & ABERCROMBIE), Calcutta (v. MARTENS), Poulo Condor (ROCHEBRUNE), 
Philippines (ELERA). 
Septifer bilocularis, L. 
Mytilus bilocularis, Linné:, Systema Nat. ed. X, 1758, p. 705, No. 212. — ed. XII, p. 1156. — Mus. Ludovy. 
Ulric, 1764, p. 540. 
Tichogonia — — Martini u. CHemnirz, Conchyl. Cabin., VII Bd., 3 Abth., p. 10, pl. 2, figs. 11—17. 
Septifer — —  Dunker, de Septiferis gen. Mytilaceorum et de Dreisseniis, 1855, p. 6. 
-- — — Epa. A. SmirH. Challenger Exp. Lamellibranchiata, 1885, p. aiile 
— — -——  P. Fiscuer, Catal. d. Moll. de l'Indo Chine, p. 214. 
DauTzENBERG & FiscHERr, Journ. de Conchyl., vol. 53, 1905, p. 450. 
Mytilus Nicobaricus, CHeMNirz, Conchyl. Cabin., VII, 1785, p. 155, pl. 82, figs. 736 —37. 
— — — REEVE, Conchol. icon., X, Mylilus, Sp. 42. 
Very commonly distributed between Koh Kram and Koh Kut, 1—30 fathoms, 
sand, shells, mud and gravel; between old coral blocks. 
Long. 3—48 mm. 
Distribution: — Singapore, Strait of Malacca, Nicobars, Andamans, Aracan 
coast, Ceylon, Mahlos Atoll (Maldive Archip.), Persian Gulf, Red Sea, Seychelles, 
Amirantes, Madagascar, Mascarene Isls., Querimba Isls., Zanzibar, Mozambique, Natal. 
— Poulo Condor, China, Tonkin, Hongkong, Japan (Nagasaki), Philippines, Sumatra, 
Christmas Isl., Celebes, Sulu Isls., Moluccas, Sunda Isls., Aru Isl., Sorong, New Guinea, 
Salomo Isls., Torres Str., East Australia, New Caledonia, Marianne Isls., Viti Isls., 
Paumotu Isl. 
This species, which varies greatly, both in regard to colour and form, has 
presented to many authors the temptation of forming new species. Epa. Smrrn, in 
his report of the Lamellibranchiata of the Challenger Expedition (p. 271), has 
enumerated various synonyms, and undoubtedly some more may be added. Jukes- 
Browne! gives the gen. Septifer as a sub-genus of Brachyodontes. 
1 Proc. Malacolog. Soc. London, vol. VI, 1905, p. 223. 
