200 104 
of Siam; only in one individual is there any indication of this tinge of colour; in 
that specimen the red colour radiates downwards over the valves, both within and 
without, but in all the others the shells are quite white, with a thin yellow epidermis, 
which is often quite worn off, or is present only in remnants. 
Tellina (Moerella) Berghi n. sp. 
(PI. III, Figs. 47—49). 
This shell is oblong-ovate, white and rather thick-valved; the umbones are 
situated towards the posterior end; a slight indication of a keel extends from the 
umbo obliquely down towards the posterior angle of the ventral side, which curves 
gently like the anterior and posterior sides, into which it passes without angle- 
formation. The surface is sculptured with close-set, parallel, raised, concentric 
strie; on the posterior side some of these striz, for want of space, do not extend 
quite to the hinder upper margin, but otherwise all the striz extend entirely round the 
valve. These raised concentric striz, and also the spaces between them, are orna- 
mented with very fine, close-set, concentric lines, which are again crossed by fine 
radiating grooves which become more distinct the nearer they approach the ventral 
side; all of which produces, if seen under the lens, an exceedingly beautiful and fine 
beadlike sculpture, resembling fine weaving. The interior of the valves is white and 
glossy. In the right valve there are two well developed, oblong lateral teeth and 
two cardinal teeth, of which the hinder is bifid and considerably larger than the 
anterior. 
Long. 7 mm., alt. 5 mm., crass. 3 mm. 
The strand of Koh Kahdat (7/2). 
This species belongs to the group T. semen, Hanl., T. semitorta, Sowb., T. mira- 
cyllium, Mely., ete., but its characteristic and beautiful sculpture easily distinguishes 
it from nearly-allied species. Unfortunately only one right valve was obtained. I 
haye dedicated this species to the late Professor Rup. BeRGu, the eminent author 
of so many valuable works on Mollusca, who has also described the Nudibranchs 
of the Gulf of Siam, and to whom I personally owe thanks for much encourage- 
ment and kindness. 
Tellina (Moerella) tenuilirata, Sow. 
Tellina tenuilirata, SowErBy, REEVE, Conchol. icon., XVII, 1867, Tellina, Sp. 219 (non T. tenuiliralta, 
Sowerby, Conchol. icon., Sp. 253 == T. semilaevis, v. Martens). 
— Anaas, Proc. Zool. Soc. London, 1867, p. 919, No. 48. 
i ~- Epc. Smiru, Rep. Lamellibranchiata of the Challenger Exped., p. 106. 
(Homala) tenuilirata, Sowrnrny, V. Bertin, Revision d. Tellinidés, p. 299, No. 234. 
tenuilirala, SowERBy, Prircuard & Gariirr, Proceed. Roy. Soc. Victoria, XVI, 1903, p. 116. 
Koh Kram, 30 fathoms (2/2). Between Koh Mesan and Cape Liant, 5—9 fathoms, 
sand (*/2). N. of Koh Kam, 5 fathoms, gravel (‘/2). Off Koh Kram, 10 fathoms, 
gravel ('/2). Gulf of Rayong, 7—10 fathoms, sand, mud (1). Koh Kahdat, 1—5 
fathoms, sand (°/2). 
