456 CYPRINIDiE. 



and Cornwall are its chief habitats (S. II.). On the east 

 coast, it is taken off Scai-borougli (Bean) ; and Northum- 

 berland (Alder). On the west, it occurs in the Bristol 

 Channel (Jeffreys) ; Milford Haven, in eight to twelve 

 fathoms, and off Anglesea in twelve fathoms (M'Andrew 

 and E. F.) ; the Isle of Man in twelve to twenty-five 

 fathoms (E. F.). It is abundant throughout the Hebrides, 

 most plentiful in from fifteen to twenty fathoms water. On 

 the Zetland coast it is common, and occurs at great depths, 

 as in seventy fathoms, thirty miles from Noss, and in eighty 

 fathoms on the west coast (M'Andrew). Along the east 

 coast of Scotland it is also not unfrequent, and has been 

 taken in thirty-four fathoms in the Moray Firth. " It is 

 dredged sparingly in Ireland all along the Antrim coast, 

 and in Belfast and Strangford Lough from eight to twenty- 

 five fathoms in sand and mud (Hyndman and W. T.) ; 

 Bray (Turton and Brown) ; rarely obtained at Youghal 

 and Cork" (W. Thompson). Bantry Bay (Mrs. Puxley). 

 As a foreign shell it ranges all along the European 

 coasts, but diminishes in numbers as we proceed south- 

 wards from Britain. It is known as a pleistocene fossil, 

 though very scarce as compared with elliptica. 



A. cREBRicosTATA, Forbes. 



Concentrically lyrated with very numerous sharply defined 

 narrow ribs, which become obsolete posteriorly ; ventral margin 

 internally crenated. 



Plate XXX. fig. 9. 



Aslarte crehricosiata, Forbes, Annals Nat. Ilist. vol. xix. p. 98, pi. D, f. 4. 



The perfect condition in which pleistocene fossils are 

 found in many of the glacial beds on the coast of Scot- 



