130 34 



Mytiliis viridis, Linnk, Hamley, Ipsa Liniiæi Coiicliylia, p. 145. 



~ — — Dautzenbehg & Fischer, Journ. de Conchyl., vol. 54, 1906, p. 211. 



— Smaragdinus, Chemnitz, Conchyl. Cabin., VIII, 1785, p. 166, pi. 83, fig. 745; pi. 84, fig. 746. 



— smaragdinus, — Reeve, Conehol. icon., X, Mytiliis, Sp. 28. 



— — — Martini u. Chemnitz, Conchyl. Cabin., VIII, S Abth.. p. 31, pi. 3, fig. 5; 



pi. 13, figs. 1-2. 



— — — V. Martens, Proc. Zool. Soc. London, 1860, p. 17. 



— — — L, Morlkt, .Journ. de Conchyl.. vol. 37, 1889, p. 161. 



— opallis, Lamarck, Hist. nat. d. aniin. s. vert., VI, part. 1, 1819, p. 124, No. 18. — éd. 2, VII, 1836, 



p. 43, No. 18. 



"Siam" (E. v. Martens, gathered by Mouhot). 



This species does not occur in the collections made by the Danish Expedition. 



Distribution: — Singapore (Elera), Mergui Isis. (v. Martens), Delta of the 

 Irawady in Pegu (Blanford), Madras (Melvill & Standen, and others), Gulf of 

 Manaar (Thurston), Bombay (Melvill aAhercrombie), Karachi (Melvill & Standen), 

 Persian Gulf (v. Martens), Red Sea ? (P. Fischer). — Cochin China (L. Morlet), 

 Ben-Son, Annam (Boutan), Canton (Jones & Preston), Hongkong (Mus. Zool. Univers. 

 Haun.), Shanghai (Frauenfeld), Philippines (Elera), Borneo (Reeve), Auckland? 

 (Frauenfeld). 



Chemnitz records his species M. Smaragdinus from Tranquebar and Guinea. 



Modiola Hanleyi, Dunk. 



Modioki Hanleyi, Dinkeu, Inde.\ molluscor. mar. Japonici, 1882, p. 223, pi. 16, figs. 3—4. 



— — — Martini u. Chkmnitz, Conchyl. Cabin., VIII Bd., 3 Abth., p. 95, pi. 20, figs. 4— 5. 



S. of Koh Chuen, 30 fathoms, shells (1). Koh Kahdat, 1 — 5 fathoms, sand 

 with stones (3). 



Long. 9 — 49 mm. 



Distribution: — Singapore, shallow water (Sv. Gad). — Japan. 



Several of the specimens from the Gulf of Siam were hidden in their nests 

 of byssus-threads. 



Modiola rhomboidea, Hani. 



Modiola rhomboidea, Hanley, Martini u. Chemnitz, Conchyl. Cabin., VIII, 3 Abth., p. 103, pi. 26, fig. 10. 



Gulf of Rayong, 7 — 10 fathoms, sand and mud (1). S. of Koh Samit, 20 fathoms, 

 mud (2). Koh Chang, 3—5 fathoms, clay ('/a). W. of Koh Chang, 20 fathoms, 

 mud (1). OtT Koh Kut, 5 fathoms (1). 



Long. 16—35 mm. 



Distribution:— Charbar and Gulf of Oman (Melvill & Standen). — China 

 (Coll. Paetel), Japan (Dunker). 



Like many other jl/orf/o/a-species, the present species spins a kind of protecting 

 nest of byssus- threads, which almost covers the animal. The specimens from the 

 Gulf of Siam agree exactly with the figure in Martini u. Chemnitz; but I find that 

 Reeve's figure and description (Conchol. icon., X, Modiola, Sp. 28) much more closely 



