194 98 



Teilina (Arcopagia?) languida, Sm. 



TelUna{9) languida, Edg. Smith, Report on the Lamellibraiichiata of the Challenger Expedition, 1885, 

 p. no, pi. 4, fig. 8. 



Between Koh Rin and ClifT Rock, 15 fathoms ('/a). Koh Krani, 30 fathoms (3). 

 Koh Chuen, 30 fathoms ('/a), Gnlf of Rayong, 7 — 10 fathoms, sand and mud ('/a). 

 S. of Koh Samit, 20 fathoms, mud (1). Sound of Koh Chang, 3 fathoms, soft clay ('/a). 

 Around Koh Kahdat, 1 — 10 fathoms, sand, mud, clay, and shells (5 + ''/a). W. of 

 Koh Kut, 15-30 fathoms, mud (2 + Vs). 



Long. 6—11 mm. (long. 11 mm., alt. 9 mm., crass. 5 mm.). 



Distribution: — Torres Strait and Flinders Passage (Challenger). 



The species T". mix, casta, robiista, declivis, languida, piidica, etc., form a natural 

 chain or group, which, on the one hand, cannot be placed entirely in Leach's 

 subgenus Arcopagia, (H. and A. Adams 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 tlie genus 

 Tellina needs critical investigation. Several authors (e. g. Récluz' and Römer-) have 

 already attached but little importance to this subgenus Arcopagia. 



Tellina (Arcopagia?) pudica, Hani. 



(PI. Ill, Figs. 35-37). 



.Tellina pudica, Hanley, Proc. Zool. Soc. London, XII, 1844, p. 62. 



— — — SowERiiY, Thesaurus Conchyl., I, p. 246, No. 46, pi. 56, fig, 7. 



— — — Reeve, Conchol. icon., XVII, Tellina, Sp. 176. 



— (Arcopagia) pudica, Hani.ev, Römer in Martini u. Chemnitz, Conchyl. Cabin., X Bd., 4 Abth., p. 95. 



— (Peronœa) — — V. Rertin, Révision d. Tellinidés, p. 272, No. 1(13. 



A great many specimens taken from numerous localities between Koh Chuen 

 and Koh Kong, 3—30 fathoms, mud, clay. 



Long. 3—95 mm. 



Distribution: — Philippines, Japan (Allart). 



The specimens from the Gulf of Slam have a somewhat longer rostrum than 

 that shown in the figures by Hanley and Reeve; this species is characterised bj' 

 being strongly polished, glossy, smooth and milk-white in colour; the umbones are 

 prominent and rounded at their apices, and the whole outline recalls that of a 

 Niiculana or (as Hanley says) of a Neaera. 



Tellina (Arcopagia?) Smithi n. sp. 



(PI. Ill, Figs. 38—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 evenlj' 

 into the ventral side, the latter is slightly curving and passes without angle-forma- 



' Revue zoologique publ. p. Gucrin-Méncville, 1846, pp. 48 — 55. 

 -' Martini u. Chemnitz, Conchyl. Cabin., X 15d., 4 Abtli., p. 72. 



