the West Coast of Davis's Strait. 333 



description of Pecten vitreus, and I think are undoubtedly his spe- 

 cies. The specimens brought by Parry, however, seem to have 

 wanted the fine, numerous, slightly depressed radiating striae on 

 the right or lower valve ; but these strise are not by any means 

 conspicuous ; it is therefore possible that Mr. Gray may have 

 overlooked them. They have also escaped the notice of Mr. G. 

 B. Sowerby, jun., who figured and described from the specimens 

 brought by Messrs. Warham and Harrison. It is probable like- 

 wise that this character may occasionally be wanting, for in 

 one of the three specimens they are almost obliterated; and 

 the right valve is always more or less eroded, having a thin, 

 opake chalky outer layer that readily falls off. The left valve has 

 a few distant, broad, rounded, almost obsolete rays, which are 

 only discernible with a side light. 



Mr. Sowerby's name must have precedence, as the one given 

 to this species by Mr. Gray was pre-occupied. 



Nucula inflata, n. s. PI. V. figs. 13, 14. 



Shell subtriangular, a little oblique, ventricose, thin, smooth, 

 covered with a shining greenish yellow epidermis, slightly con- 

 centrically wrinkled ; umbones small, eroded, placed much to one 

 side ; posterior slope long, somewhat flattened, slightly convex ; 

 anterior slope rather short, straight, and with a shallow cordate 

 depression; basal margin regularly rounded, entire, forming 

 rather abrupt angles at its junction with the sides, particularly 

 in front ; hinge with twenty teeth on one side and twelve on the 

 other. Length T 9 g inch ; breadth |§ inch ; depth T % inch. 



This species is not unlike Nucula tenuis ; the greater size and 

 more angulated form however of N. inflata will readily distinguish 

 it ; it is also much longer in proportion to its breadth, is very 

 much more ventricose and less oblique ; its teeth are also more 

 numerous. 



A single individual occurred ; it was dead, but quite perfect. 



Leda rostrata 3 Lamarck sp. 



Nucula rostrata, Lam. 2nd ed. vol. vi. p. 504. 

 Leda buccata, Stp. in M oiler's Index Mollus. Grcenl. p. 17. 

 This species differs considerably from the Area rostrata of 

 Montagu : it is larger and appears to be much more ventricose ; 

 the rostrated end is more abruptly truncated, and is scarcely at 

 all bent. 



Only one specimen was procured : it is |f inch broad and 

 nearly T 7 7 inch long. 



Leda minuta, Fabricius sp. 



Area minuta, O. Fabr. Fauna Grcenl. p. 414; Chemn. Coneh. 

 vol. x. p. 351. 1. 170. f. 1657, 1658. 

 This nearly resembles the Nucula minuta of British authors, 



