33 129 
Islands in the Gulf of Siam (L. Mor.et, loc. cit.). 
The Danish Expedition to Siam collected no specimens of this species. 
Distribution: — Mergui Archip., Ceylon (?). — Cochin China, Poulo-Condor, 
Philippines, Amboina. All the other localities recorded in the literature should 
no doubt be referred to “P. pectunculus L. (EpG. Smiru.)” 
Epa. SmiTu (loc. cit.) is of opinion that Linné (under the name of Arca pectun- 
culus), LAMARCK, and others have confused two well-distinguished Pectunculus species; 
one species in which the interstices between the ribs are rather broad and well- 
marked as shown, for example, in Saviany’s figure (Descript. de l’Egypte, Coquilles, 
pl. X, fig. 2), and another species (the one we are here considering) in which the 
broad ribs stand close to each other, separated only by a groove, without any well- 
marked interstices. Also, in the first-named species, the interior of the valves has 
a strong reddish-brown colour on the hinge-plate below the teeth, a feature which 
is said not to occur so pronouncedly in the other species; but I am in doubt how 
far the latter is a constant character. 
Limopsis cancellata, Reeve. 
Pectunculus cancellalus, REEVE, Proc. Zool. Soc. London, XI, 1843, p. 188. 
_ — Conchol. icon., I, Pectunculus, Sp. 39. 
Limopsis cancellata, REEVE, Epa. A.Smiru, Report on the Lamellibranchiata of the Challenger Expedit., p. 256. 
—  Woodwardi, A. Avams, Proc. Zool. Soc. London, 1862, p. 231 (fide Epc. Smirn). 
a — —_ Dunxer, Index molluscor. mar. Japon., p. 237, pl. XVI, figs. 5—6. 
—  Philippii, A. Apams, Proc. Zool. Soc. London, 1862, p. 230 (fide Epc. Smiru). 
Arca multistriata, ForsKaL, Descript. animal. que in itin. orient. observ., 1775, p. 123 (fide A. H. Cooke). 
Pectunculus multistriatus, FORSKAL, REEVE, Conchol. icon., I, Pectunculus, Sp. 42. 
Limopsis multistriata, Forskat, Savicny, Descript. de l’Egypte. Coquilles, pl. X, fig. 3. 
— — juv., A. H. Cooxe, Ann. and Mag. Nat. Hist., 5 Ser., vol. 18, 1886, p. 95. 
W. of Koh Kut, 30 fathoms, sand and mud (*/2 
Long. 2—6 mm., alt. 2—6 mm. 
Distribution: — Singapore, Gulf of Manaar, Arabian Sea (lat. 18° 25’) 
long. 71° 45’ E.; in 191 fathoms), Red Sea, Suez. — Japan, Torres Strait, Mast Head 
Reef (Queensland), Port Jackson. 
Limopsis Tenisoni, Ten. Woods (= L. cancellata, Ten. Woods non Reeve) from 
Tasmania and South Australia has been erroneously determined and referred to 
L. mullistriata, Forsk.' by Tate and May. 
Fam. Mytilidae. 
Mytilus (Chloromya) viridis, L. 
Mytilus viridis, Linné, Syst. Nat., ed. X, 1758, p. 706, No. 220. — Mus. Lud. Ulr. 1764, p. 542, No. 138. — 
Syst. Nat., ed. XII, 1767, p. 1158, No. 25 
— _ — Han ey, Catalogue of rec. biv. shells, p. 247. 
1 For further details cf. Proc. Roy. Soc. Tasman., 1876 (1877), p. 156; 1877 (1879), p. 56. — Proc. 
Linn. Soc. New South Wales, 1901, p. 437. — Scient. results of the trawling expedition of H. M. C. S 
“Thetis” off the coast of New South Wales. Mollusca by C. Hedley, I, 1902. p. 297. 
D. K. D. Vidensk. Selsk. Skr., 7. Raeekke, naturvidensk. og mathem. Afd. V. 3. 17 
