28 CARDIAD^. 



traversed by concentric wrinkles ; that shell, moreover, is 

 much more angular in outline, has a slight lunule, with its 

 front costal tubercles roundish and not linear. 



The length of a full-sized example is not quite half an 

 inch ; its breadth is three-eighths of an inch. 



The animal is shaped like the shell, and entirely white, 

 with semi-opaque or flaky specks. The mantle is plain at 

 the margins. The tubes are not extended beyond the 

 eighth or fourth of an inch ; they are equal and united ; 

 the anterior one has a distinct border of about ten cirrhi, 

 which is not so evident around the anal siphon. Their 

 sides, and the mantle near their bases, are furnished with 

 longer filaments. The foot is long, securiform, and hyaline. 

 " The branchite," according to Mr. Clark, " are subsemi- 

 circular, pale brown, the upper not half the size of the 

 lower, strongly striated on the outside, smoother within ; 

 the pair of palps are very short, triangular, and pointed ; 

 striated on the outer, and much less so on the inner sur- 

 face. The liver is green and placed very anteriorly ; the 

 ovarium is white." 



This is one of our rarer Cardia, and is more frequently 

 procured dead and worn than, in its perfect condition, 

 armed with the caducous sculpture of its posterior area. 

 We suspect that the Cardiwn fasciatum of Montagu 

 (Test, Brit. Suj)pl. p. SO, pi. 27, fig. 6), was established 

 from a young worn example of this species ; at least, the 

 figure and description agree better with that stage of the 

 shell in which the flexuous chestnut bands occupy nearly 

 the entire surface, than with any other cockle known to 

 inhabit the British seas. On our southern coasts it 

 occurs in from fifteen to twenty-seven fiithoms off Port- 

 land, and in twenty to twenty-seven fathoms off Penzance 

 (M'Andrew and E. F.) ; Torbay (S. H.) ; Whitesand 



