194 98 
Tellina (Arcopagia?) languida, Sm. 
Tellina (?) languida, Epc. Smirn, Report on the Lamellibranchiata of the Challenger Expedition, 1885, 
p. 110, pl. 4, fig. 8. 
Between Koh Rin and Cliff Rock, 15 fathoms (1/2). Koh Kram, 30 fathoms (8). 
Koh Chuen, 30 fathoms (‘/2). Gulf of Rayong, 7—10 fathoms, sand and mud (*/:2), 
S. of Koh Samit, 20 fathoms, mud (1). Sound of Koh Chang, 8 fathoms, soft clay (1/2). 
Around Koh Kahdat, 1—10 fathoms, sand, mud, clay, and shells (5 + 1/2), W. of 
Koh Kut, 15—30 fathoms, mud (2 ++ */2). 
Long. 6—11 mm. (long. 11 mm., alt. 9 mm., crass. 5 mm.), 
Distribution: — Torres Strait and Flinders Passage (CHALLENGER). 
The species 7. nux, casta, robusta, declivis, languida, pudica, etc., form a natural 
chain or group, which, on the one hand, cannot be placed entirely in LEACH’s 
subgenus Arcopagia, (H. and A. ApAms have done this, notwithstanding the fact that 
the character “posterior side rounded” is wanting in several of the species), but, - 
on the other hand, it shows how much the division into subgenera of the genus 
Tellina needs critical investigation. Several authors (e. g. REcLuz' and ROMER?) have 
already attached but litle importance to this subgenus Arcopagia. 
Tellina (Arcopagia?) pudica, Hanl. 
(Pl. III, Figs. 35—37). 
Tellina pudica, Hanury, Proc. Zool. Soc. London, XII, 1844, p. 62. 
— - — Sowerby, Thesaurus Conchyl., 1, p. 246, No. 46, pl. 56, fig. 7. 
— — Reeve, Conchol. icon., XVII, Tellina, Sp. 176. 
(Arcopagia) pudica, HaNLey, ROMER in Marrini u. Cuemnirz, Conchyl. Cabin., X Bd., 4 Abth., p. 95. 
(Peronea) -— — V. Bertin, Révision d. Tellinidés, p. 272, No. 103. 
A great many specimens taken from numerous localities between Koh Chuen 
and Koh Kong, 3—30 fathoms, mud, clay. 
Long. 3—9°5 mm. 
Distribution: — Philippines, Japan (ALLART). 
The specimens from the Gulf of Siam have a somewhat longer rostrum than 
that shown in the figures by Hantey and Reeve; this species is characterised by 
being strongly polished, glossy, smooth and milk-white in colour; the umbones are 
od I 2d J) 
prominent and rounded at their apices, and the whole outline recalls that of a 
Nuculana or (as HANLEY says) of a Neaera. 
Tellina (Arcopagia?) Smithi n. sp. 
(Pl. Ill, Figs. 88—39). 
This shell is ovately-triangular in form, very thick-valved, pure white in colour, 
and somewhat glossy. The anterior end, which is roundly elongated, passes evenly 
into the ventral side, the latter is slightly curving and passes without angle-forma- 
1 Revue zoologique publ. p. Guérin-Méneville, 1846, pp. 48—55, 
* Martini u. CoEmMNitz, Conchyl. Cabin., X Bd., 4 Abth., p. 72. 
