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. Ill, Figs. 47-49). 



This shell is oblong-ovate, white and rather thick-valved; the umbones are 

 situated towards the posterior end; a sliglit 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 

 striæ; on the posterior side some of these striæ, for want of« space, do not extend 

 quite to the hinder upper margin, but otherwise all the striæ extend entirely round the 

 valve. These raised concentric striæ, 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 (»/2). 



This species belongs to the group T. semen, Hani., T. semitorta, Sowb., T. mira- 

 cylliuiv, Melv., etc., but its characteristic and beautiful sculpture easily distinguishes 

 it from nearly-allied species. Unfortunately only one right valve was obtained. I 

 have dedicated this species to the late Professor Run. Bergh, the eminent author 

 of so many vahiable 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, Sowf.rby, Reeve, Conchol. icon., XVII, 1867, Tellina, Sp. 21!) (non 7". tenuilirata^ 



Sowerby, Conchol. icon., Sp. 253 = T. seniilaevis, v. Martens). 



— — — Angas, Proc. Zool. Soc. London, 1867, p. 919, No. 48. 



' — — — Edg. Smith, Rep. Lamellibianchiata of tlie Challenger Exped., p. lOfi. 



^ (Homala) tenuilirata, Sowekby, V. Rehtin, Révision d. Tellinidés, p. 299, No. 234. 



— tenuilirata, Sowerby, Pritchahd & Gatlii-k, Proceed. Roj'. Soc. Victoria, XVI, 191)3. p. 116. 



Koh Kram, 30 fathoms (^/2). Between Koh Mesan and Cape Liant, 5 — 9 fathoms, 

 sand ('/a). N. of Koh Kam, 5 fathoms, gravel ('/s). 01Ï Koh Kram, 10 fathoms, 

 gravel (^a). Gulf of Rayong, 7—10 fathoms, sand, mud (1). Koh Kahdat, 1—5 

 fathoms, sand ("'/:;). 



