384 TELLINID^:. 



6. T. SQUA'LIDA *, Pulteney. tf?< 



11 



T. squatida, Pult. in Hutch. Dors. p. 29. T. incarnata, F. & H. i. p. 298, 

 pi. xx. f. 5. 



BODY whitish with a rosy or fleshcolour tint : mantle having 

 its edges strongly fringed : tubes speckled ; orifices plain : foot 

 large. 



SHELL triangularly oval, somewhat inequivalve (the left 

 valve being larger than the right), flattened, rather thin but 

 almost opaque, of a satiny lustre : sculpture, numerous and 

 fine concentric striae, which are more close-set in the young 

 and afterwards become slightly laminar and imbricated ; the 

 posterior side has none of these strias, but is marked across 

 with oblique, flexuous, and more compact stria3, giving that 

 side a rough or scabrous appearance ; the right valve is more 

 striated than the left; the surface is also covered with the 

 same parallel and microscopical striaB as are observable in the 

 last species : colour pale orange or yellow, with often a reddish 

 mark near the beaks and occasionally one or two faint longi- 

 tudinal rays of a whitish hue on the posterior side, which ex- 

 tend from the beaks to the lower margins of the fold : epidermis 

 fibrous and brown, usually rubbed off except at the edges : 

 margins rounded in front, semioval on the anterior side, ab- 

 ruptly sloping upwards, and produced at the posterior end to 

 a sharp point something like that of a ploughshare ; the poste- 

 rior side is decidedly flexuous, as well as obliquely truncate ; 

 the dorsal margin on the posterior side is straight, and that 

 side is divided lengthwise by two more or less deep and dis- 

 tinct furrows, which run from the beak to the posterior angle : 

 beaks projecting, small, pressed together and worn by the con- 

 tact, turned towards the posterior side : ligament rather large, 

 prominent, dark horncolour, separating the valves by a long 

 lanceolate gap or depression: liinge-line obtusely angular: 

 hinge-plate rather narrow : teeth, cardinals as in T.fabula ; the 

 right valve only has a lateral, placed on the anterior side near 

 the beak and of an obtusely triangular shape : inside polished, 

 longitudinally striated towards the margin, coloured more 

 deeply than the outside : pallial scar large, of the same shape 

 as in all the other species of this section : muscular scars simi- 

 lar to those of T. fabula. L. 1-1. B. 1-8. 



HABITAT : Not common, on sandy coasts of the 

 * Hough. 



