302 



T. testa elongato-obloiiga, subsequivalvi, maxime insequilate- 

 ralij extus intusque Candida^, ]oevigati\ convexa aut subventricosa ; 

 margiue veiitrali posticc couvexiusculoj aiitice arcuato et sursmn 

 acclinato ; dorsali aiitice convexiuseulo paululimique declivi, pos- 

 tice retuso et valde declivi, extremitate autica rotundato-attenuata; 

 latere postico brevissiino^ obtuse cimeiformi; ligainento subiiifosso; 

 costa mnboiiali subobsoleta ; deutibus minimis. 



Elongated-oblong, subequivalve^ extremely inequilateral, white 

 both within and without, convex or subventricose, smooth, with 

 however obsolete radiathig lines, and very indistinct striulee towards 

 the ventral margin, wliich latter is straightish beliind, but curves 

 upward in front, so as somewhat to attenuate the rounded anterior 

 extremity ; front dorsal edge scarcely at all sloping, rather convex ; 

 posterior side very short and obtusely wedge-shaped, the dorsal 

 edge refuse and decidedly sloping ; ligament rather sunken ; fold 

 nearly obsolete ; teeth minute. 



Cliina (?) Mus. Metcalfe. 



Yery closely allied to Galatsea, but narrower, more convex, and 

 utterly devoid of those radiating lines of raised dots, which are so 

 characteristic of that species. The posterior extremity is more 

 regularly cuneiform, and the anterior termination more attenuated. 



15G. Tellina ELONGA.TA (pi. Ixu. f. 199.) Hanleij, Zool. Proc. 

 1844. 



T. testa elongata, angusta, tenuiuscula, satis convexa, extus in- 

 tusque Candida, laevigata, valde iuffiquilaterali ; margine ventrali 

 meclio snbretuso, anticc oblique arcuato; dorsali antice subhori- 

 zontali et subrecto, postice subdeclivi et snbretuso; extremitate 

 lateris antici longioris obtusa postica acuminato-truncata ; hga- 

 mento infosso ; flexura obsoleta ; dentibus parvis. 



Elongated, narrow, tliinnish, moderately convex, smooth, white, 

 very inequilateral ; ventral edge rather refuse in the middle, and 

 obliquely arcuated anteriorly ; anterior side the longer, its extre- 

 mity obtuse, its dorsal edge almost horizontal and nearly straight ; 

 hinder extremity with a truncated acumination, the ligamental edge 

 sHghtly incurved and moderately sloping ; flexure obsolete ; liga- 

 ment siuiken ; inside white ; teeth small. 



Chiriqui, West Columbia. 



157. Tellina AssiMiLis (pi. Iviii. f. 95.) Ranley, Zool Proc. 

 1844. 



T. testa T. elongatse simiUima, convexiore autem, et latere postico 

 obtuse cuneiformi paululumque subrostrat^. 



