86 Shell Life 



lations which enable the valves to interlock. It is 

 recorded from deep water (IS to 80 fathoms) at 

 Shetland, Skye, Antrim, Galway, Exmouth, and 

 Guernsey 



The Mottled Scallop (P. striatus) differs but 

 slightly at first sight from Testa's Scallop, but it 

 is " larger, thinner, and more fragile," the ribs are 



thickly covered along their 

 ridges with projecting 

 scales, and crossed by 

 minute and irregular raised 

 lines. The colouring, though 



Mottled Scallop, shell and animal «imilar, is IcSS bright. Thc 



whitish animal has 25 

 crimson pupilled, blue-black ocelli, of unequal size 

 and irregular disposition. It is found on hard 

 ground in from 12 to 90 fathoms of water round 

 Shetland, Scotland, north-east England, Ireland, Man, 

 and Scilly. 



The Pygmy Scallop (P. smiilis) is a minute 

 and exceedingly fragile species, of almost circular 

 form. The lower valve is much smaller than the 

 upper, and looked at from above the right ear is 

 larger than the left. The sculpturing takes the 

 form of fine concentric lines instead of the usual 

 radiating ribs ; the colour white or yellowish, 

 streaked or mottled with brown or white. The 

 animal has about 20 unequal ocelli in two series, 

 black with a pearly centre. It prefers sandy 

 bottoms of a muddy quality, and ranges from 2 

 to 80 fathoms, all round our islands, but is nowhere 

 very plentiful. 



The Great Scallop or Clam (P. maximus) differs 



