106 POPULAR BRITISH CONCHOLOGY. 



P. tigrinus : either without ribs, or two or three very broad 

 ones; one auricle very small, the other large and 

 strongly ribbed ; variously coloured. 



P. Banicus : rather triangular, with auricles both small; 

 very variable in sculpture. 



P. svmilis : minute, smooth, expanded at one side, longer 

 than broad. 



P. maximiis (the great eatable Scallop) : nearly equal-sided; 

 one valve flat, strongly ribbed ; the other valve white, 

 deeply concave, overlapping it; colours in festooned 

 patches over the ribs. 



P. opercularis, the equal- valved, variable shell, so often 

 pierced and used as pincushions". It is rounded, broad, 

 with finely-serrated angular ribs, and auricles not so 

 unequal as P. varins. Trom a bright red to yellow, 

 orange and brown, brilliantly painted and mottled, this 

 interesting shell presents every shade of variation, of 

 which one of great beauty is that of a delicately-white 

 surface, witli a bright red line on each rib. Commonly 

 called P. Uneatus. 



P. 2^iis'io : with the characters of a Pecten, this species has, 

 in advanced life, the habit of an oyster. Tree wlien 

 very young, it soon settles down to a sedentary exist- 



