372 TELLINID.E. 



gitudinally lineated : pallial scar slight, large, but not extend- 

 ing far into the interior : muscular scars well denned. L. 0*75. 

 B. 0-85. 



HABITAT : Rare (in the sense of local) , in fine sand, 

 at the undermentioned places and depths : Falmouth, 

 among trawl refuse from about 20 fathoms (Miss Vigors, 

 Mrs. Gulson, and Mr. Cocks) ; Birterbuy Bay, co. Gal- 

 way, 18-20 fathoms (Barlee and J. G. J.) ; Stornoway 

 and Skye, 40-50 fathoms (Barlee) ; Moray Firth, in deep 

 water (Macdonald) ; Shetland, 18-78 fathoms (J. G. J.). 

 Fossil in the Coralline Crag (S. Wood). It inhabits 

 every part of the Mediterranean, Adriatic, and JEgean, 

 at from 6 to 50 fathoms, and M 'Andrew has dredged 

 it off Madeira and the Canary Isles in 20-25 fathoms. 

 Philippi enumerated it as a Sicilian tertiary shell. 



This is one of the much sought-for treasures of the 

 British conchologist, apparently scarce, but found in 

 many parts of the North Atlantic, 



" All scatter'd in the bosom of the sea." 



The market-price of perfect specimens may be said, 

 in mercantile phrase, to " rule " from 2 to 5. Sepa- 

 rate valves and fragments have not unfrequently been 

 brought up in the dredge on the eastern coasts of Shet- 

 land, at a considerable distance from land, and far be- 

 yond the course or influence of the Gulf-stream. The 

 fry are triangular, and in shape not unlike those of 

 Lucina borealis. My largest specimen (a single valve) 

 is about an inch in breadth. The dimensions of British 

 examples greatly exceed those of any from the Mediter- 

 ranean; and they can always be thus distinguished. 

 Although the present species may be considered a 

 southern form, it is a striking illustration of the fact 

 that the development of size in individuals of the same 

 species in the Mollusca increases northward. Lilljeborg 



