37 133 
Modiola lignea, Reeve. 
Modiola lignea, Reryve, Conchol. icon., X, Modiola, Sp. 58, pl. X, fig. 71. 
— — — Marrint u. CHEMNitrz, Conchyl. Cabin., VIII, 3 Abth., p. 102, pl. 27, fig. 3. 
S. of Koh Chuen, 30 fathoms, shells (2). Koh Kahdat, 1—5 fathoms, sand (1). 
Long. 15—20 mm. 
Distribution: — Gulf of Aden (Shopland), Red Sea (Sturany). — Torres Strait 
(Metvitt & STANDEN), Australia (CLEssiN), Port Elizabeth (Sowerby). 
No locality was given for ReEve’s original specimens in Cumrne’s collection; 
the species has since been found on the coasts of Australia and South Africa. It 
is also recorded from the West Indies, but this is undoubtedly due to erroneous 
determination. W. H. Dati states, in the report on the Mollusca of the Blake 
Expedition,! that he has specimens from the east and west coasts of Florida; and 
elsewhere? he states that it occurs along the east coast of America from S. Caro- 
lina to St. Thomas. I have in my collection, specimens from St. Thomas, collected 
by A. H. Ruse, and determined by Morcn as M. lignea, Reeve; but the most im- 
portant distinguishing characters of this species — the well-marked and conspicuous 
lines of growth on the front and hinder parts, while the middle is smooth — do 
not occur at all in these specimens, which are perfectly smooth all over the valve; 
nor, in Datr’s description of the Mollusca of the Blake Expedition are these cha- 
racters mentioned. The American specimens undoubtedly belong to another species. 
Modiola arcuatula, Hanl. 
Modiola arcuatula, HANEY, Proc. Zool. Soc. London, XII, 1844, p. 16. 
= — -— Reeve, Conchol. icon., X, Modiola, Sp. 27, figs. 27 and 45. 
= _ — Martini u. CHEMNiTz, Conchyl. Cabin., VIII, 3 Abth., p. 101, pl. 30, figs. 8—9. 
_ — _ L. Moret, Journ. de Conchyl., vol. 37, 1889, p. 161. 
— — P. Fiscuer, Catalogue d. Mollusques de I’Indo-Chine, p. 212. 
Siam (P. Fiscuer). Cambodge, at the exit of the river Kampong-Son (L. Mortet). 
This species does not occur in the collections made by the Danish Expedition. 
Distribution: — Singapore, Mergui Isls. — Cochin China, Japan, Philip- 
pines, Java, 
Modiola glaberrima, Dunk. 
Volsella glaberrima, DunKrEnR, Proc. Zool. Soc. London, XXIV, 1856, p. 363, No. 16. 
Modiola — — ReEEveE, Conchol. icon., X, Modiola, Sp. 48. 
= = — Martini u. CHEMNITZ, Conchyl. Cabin., VII, 3 Abth., p. 99, pl. 27, figs. 7—8. 
= = _— Epa. A. Smiru, Report on the Lamellibranchiata of the Challenger Exped., 
p. 275. 
NW. of Koh Chang, 10 fathoms, mud (7/2). S. of Koh Chuen, 30 fathoms, 
shells (3). S. of Koh Samit, 20 fathoms, mud (‘/z). Sound of Koh Chang, 3—5 
1 Report on the Mollusca. “Blake” Expedition, 1877—80, I, p. 236. Cambridge 1886. 
2 W.H. Dall, Catalogue of the shell-bearing marine Mollusks and Brachiopods of the south-eastern 
coast of the United States. Washington 1889, pp. 38-39. 
