TELLINA. 297 



the comparison of the two shells ; for, Independently of 

 the largest known specimens (from L, Carron and L. 

 Alsh) never attaining to qnite half an inch in length and 

 a quarter of an inch in breadth, and these are not young 

 fragile shells, but manifesting their adolescence by their 

 solidity ; the posterior end is not wedge-shaped but blunt, 

 and the sides are far more unequal than even in Donacina. 

 In proportion to its size it is more convex too, and this 

 convexity is more evenly diffused, there being no posterior 

 compression as in that species ; it has striulae, not strife, and 

 certain characteristics, as the short red perpendicular ray, 

 and the crimson stain upon the front dorsal edge, which 

 appear permanent in the latter, are by no means so in p^/g- 

 m(Ba. The lesser development of its umbonal ridge, and, 

 above all, the different approximation of the lateral teeth 

 to the cardinal, must not be passed over, the front lateral 

 of Donacina being invariably the closer to the primary 

 teeth. 



In England it has been taken at Holy Island in North- 

 umberland (Alder) ; at Whitesand Bay in Devon, and 

 Port Carnow Cove in Cornwall (Jeff, cab.) In Ireland 

 in Cork Harbour (Humphreys), and Galway (]>arlee). In 

 Scotland it has been dredged by Mr. INI'Andrew from a 

 sandy bottom of from eight to fifty fathoms at Cape Wrath, 

 the Hebrides, Orkneys, and Shetland Islands ; and by 

 Messrs. Jeffreys and Barlee at Lochs Alsh, Kishon, Carron, 

 &rc. Abroad it is recorded as an inhabitant of the coasts 

 of Sweden and Norway. 



VOL, I. Q Q 



