113 209 
pallial sinus ascends from the posterior muscle-impression upwards in a curve and 
then descends obliquely down towards the palliai line, which it meets somewhat 
before the pallial line has reached the anterior muscle-impression. 
Long. 9 mm., alt. 65 mm., crass. 3°5 mm. 
North end of Koh Chang, 1 fathom, coral blocks (2 + 1%:). North end of 
Koh Chang, 12 fathoms, old coral blocks (1 + 1/2). West coast of Koh Chang, 1 
fathom, old coral blocks (*/2). South-west end of Koh Chang, 1 fathom, corals (1/2). 
Koh Kahdat, 1 fathom, sand (‘/z). Koh Kahdat, 1—2 fathoms, corals (1/2). 
This species is most closely allied to the group:-- M. inquinata, Desh., nasuia, 
Conr., constricta, Brug., etc. It is, however, easily distinguished from them by its 
characteristic sculpture. It varies considerably in form, which is no doubt due to 
its inhabiting old coral blocks. In the material collected are several individuals 
which are more ovate-oblong in form than the above description indicates; but 
this is more particularly the case with the younger individuals, almost all of 
which are more oblong than are the (apparently) full-grown ones. 
Fam. Psammobiidae. 
Asaphis deflorata L. 
Venus deflorata, L1INNE, Systema Naturae, ed. X, 1758, p. 687, No. 108. — ed. XII, p. 1133, No. 132. — ed. 
XIII cur. GMELIN, p. 3274, No. 24. 
Dittwyn, Descript. catalogue of rec. shells, I, 1817, p. 186, No. 65. 
— — — Romer, Krit. Untersuch. d. Arten d. Molluskengeschl. Venus, 1857, p. 52, No. 24. 
Asaphis — = Morcu, Journ, de Conchyl., VII, 1858, p. 139, No. 3. — Catal. Yoldi, I, 1853, p. 9, 
No. 83. 
Capsa — -— REEVE, Conchol. icon., X, 1856, Capsa, Sp. 1. 
Asaphis = — —  V.Bertin, Révision d. Garidées, 1880, p. 80, No. 5. 
— HipaLGo, Fauna malacol. de 1. isl. Filipinas, 1903, II, p. 78, No. 149. 
Capsa eflorata, v’OrpiGNy, Moll. de Vile de Cuba, II, 1853, p. 258, No. 457. 
Venus violascens, ForskAL, Descript. animal. qui in itinere orientali observ., 1775, p. XXXI, No. 28. 
Asaphis  — -— Morcu, Journ. de Conchyl., VII, 1858, p. 138, No. 2. 
ae = = V. Bertin, Révision d. Garidées, 1880, p. 80, No. 2. 
Tellina anomala, Born, Index rer. natur. Mus. Ces. Vindobon., I, Testacea, 1778, p. 20. — Testacea Mus. 
Ces. Vindobon., 1780, p. 31. 
— — —  CuxHeEmnitz, Conchyl. Cabin., VI, 1782, p. 93, pl. 9, figs. 79—82. 
Cardium coccinea, Martyn, The Universal Conchologist, 1784, No. 135. 
Asaphis — —_— Morcu, Journ. de Conchyl., VII, 1858, p. 140, No. 4. 
V. Bertin, Revision d. Garidées, 1880, p. 79, No. 1. 
Datu and Simpson, The Mollusca of Porto Rico, 1901, p. 476. 
Venus versicolor, GMELIN, Systema Naturae, 1790, p. 3281, No. 63. 
—  purpurata, — loc. cit., p. 3289, No. 100, (Monstr.?). 
Capsa rugosa, Lamarck, Systéme d. anim. s. vert., 1802, p. 125. 
Sanguinolaria rugosa, Lamarck, Hist. nat. d. anim. s. vert., V, 1818, p. 511, No. 4. — éd. 2, VI, 1835, 
p- 170, No. 4. 
Capsula = = ScuumacHER, Essai d’un nouv. syst. d. habit. d. vers. test., 1817, pp. 
130—31, pl. 9, fig. 1. 
Psammobia — — Sowersy, Genera of shells, No. 35, pl. 55, fig. 1. 
D, K. D. Vidensk. Selsk. Skr., 7. Reekke, naturyidensk. og mathem. Afd. V. 3. 27 
