130 34 
Mytilus viridis, LINN, HANLEY, Jpsa Linnzei Conchylia, p. 145. 
-- —  DaurzensperG & FiscHer, Journ. de Conchyl., vol. 54, 1906, p. 211. 
— Smaragdinus, CHEMNiITz, Conchyl. Cabin., VIII, 1785, p. 166, pl. 83, fig. 745; pl. 84, fig. 746. 
— smaragdinus, — REEVE, Conchol. icon., X, Mytilus, Sp. 28. 
—_ — — Martini u. CHEMNITZ, Conchyl. Cabin., VIII, 3 Abth.. p. 31, pl. 3, fig. 5; 
pl. 13, figs. 1—2. : 
= _ — v. Martens, Proc. Zool. Soc. London, 1860, p. 17. 
= — — L. Morter, Journ. de Conchyl., vol. 37, 1889, p. 161. 
_ opalus, Lamarck, Hist. nat. d. anim. s. vert., VI, part. I, 1819, p. 124, No. 18. — éd. 2, VII, 1836, 
p- 43, No. 18. 
“Siam” (E. v. MARTENS, gathered by Mounot). 
This species does not occur in the collections made by the Danish Expedition. 
Distribution:— Singapore (Elera), Mergui Isls. (v. Marrens), Delta of the 
Irawady in Pegu (BLANForp), Madras (MELviti & STANDEN, and others), Gulf of 
Manaar (THURSTON), Bombay (MeLyitt & ABERCROMBIE), Karachi (MELVILL & STANDEN), 
Persian Guif (v. MArrens), Red Sea? (P. FiscHer). — Cochin China (L. Morter), 
Ben-Son, Annam (Bouran), Canton (Jones & Preston), Hongkong (Mus. Zool. Univers. 
Haun.), Shanghai (FRAUVENFELD), Philippines (ELERA), Borneo (REEVE), Auckland ? 
(FRAUENFELD). 
CuemNnitz records his species M. Smaragdinus from Tranquebar and Guinea. 
Modiola Hanleyi, Dunk. | 
Modiola Hanleyi, DuNker, Index molluscor. mar. Japonici, 1882, p. 223, pl. 16, figs. 3—4. 
— = — Martini u. CHemnirz, Conchyl. Cabin., VIII Bd., 3 Abth., p. 95, pl. 26, 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 (Sy. Gap). — Japan. 
Several of the specimens from the Gulf of Siam were hidden in their nests 
of byssus-threads. 
Modiola rhomboidea, Hanl. 
Modiola rhomboidea, Hantey, Martini u. CHemnitrz, Conchyl. Cabin., VIII, 3 Abth., p. 103, pl. 26, fig. 10. 
Gulf of Rayong, 7—10 fathoms, sand and mud (1). S. of Koh Samit, 20 fathoms, 
mud (2). Koh Chang, 8—5 fathoms, clay (‘/z:). W. of Koh Chang, 20 fathoms, 
mud (1). Off Koh Kut, 5 fathoms (1). 
Long. 16—35 mm. 
Distribution: — Charbar and Gulf of Oman (MELvitt & STANDEN). — China 
(Coll. Paetel), Japan (DUNKER). 
Like many other Modiola-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. Coemnirz; but I find that 
Reeve’s figure and description (Conchol. icon., X, Modiola, Sp. 28) much more closely 
