245 



and ventral margin. 0,58... 1. Scotland. Isle of 

 Man, fyc. More delicate and more elongated than the 

 young of M. Solida. 



ERVILIA. PELLUCIDA. Macg. Aber. p. 341. 

 TELLINA. P. Brown. III. Cone. t. 16. /. 22. Ovate- 

 elliptical, compressed, very inequilateral, rounded at 

 both ends, semitransparent, glossy, white, concentrically 

 sulcated, dorsal line concave ; hinge with two slender 

 divaricate teeth separated by a triangular space. 0,04. 

 ...0,06. Aberdeen. 



MONTACUTA. GLABRA. Macg. Ab. p. 303. 

 TELLIMYA. G. Brown III. Con. t. 14. f. 19. Ovate- 

 oblong, subelliptical, very thin, subpellucid, very 

 inequilateral, nearly equally rounded at both ends, 

 convex, white or tinged with brown, nearly smooth, 

 slightly punctulate towards the margin ; inside glossy, 

 slightly granulated, somewhat irridescent ; in the right 

 valve an oblique deflexed, adherent concave tooth, and 

 a white sinus with a conical tooth, the margins chan- 

 nelled for a short space ; in the left valve a sinus with a 

 concave tooth, the margins plain. 0,25. 0,416. 

 Aberdeen. 



SPHCENIA COSTULATA. Macg. Aberd. p. 301. 



