LUCINA. 51 



short posterior margin, which is more or less straight and 

 perpendicular, forms a decided angle with the upper, and a 

 rounded off one with the lower margin. The ligament is 

 ochraceous, and by no means prominent. The interior is 

 white, or more rarely tinged with yellow ; the primary 

 teeth are almost rudimentary ; there is a distinct slightly 

 approximate anterior lateral, and a less developed distant 

 l^osterior one. 



The measured length of a large Scotch example was an 

 inch and an eighth ; its breadth, seven-eighths of an inch. 

 The Mediterranean specimens are vastly inferior in size, 

 and are usually tinged with a warmer colouring. 



The animal appears to be white ; the tubes not pro- 

 duced ; the mantle freely open ; the foot long, cylindrical, 

 very slender, and not swollen, clavate at the extremity. 

 We have never examined this creature when alive. 



This local species, an inhabitant chiefly of our western 

 oceanic shores, inhabits sandy, muddy, or weedy ground, 

 in various depths of water, between eight and one hundred 

 fathoms. It is rare in the south, though occurring off 

 Dartmouth in twenty-seven fathoms, and Plymouth in 

 twenty-eight fathoms (M'Andrew and E. F.) ; Torquay 

 (Battersby) ; and Salcombe (Montagu). We are not 

 acquainted with any other English localities for it. On 

 the Scottish coast it is more frequent, and often plentiful, 

 as at Oban, in fifteen fathoms, mud ; Lismore, in twenty 

 fathoms ; Raza, in thirty fathoms ; Mull, in ninety fa- 

 thoms ; the Zetlands, in from eighteen to eighty fathoms ; 

 and far from land as well as near the coast ; the Moray 

 Firth, in thirty-four fathoms (M'Andrew and E. F.) ; 

 " Hebrides in many places, and coast of Ross- shire " 

 (Jeffreys). Mr. Macgillivray enumerates it among his 

 shells of Aberdeenshire, but the identity of his specimens is 



