I 24 A HANDBOOK FOR SOUTHPORT. 



Modiola modiolus (Horse Mussel). Sometimes brought up by 



the fishermen, and frequently very large, from five to six 



inches in length. 

 Modiola tulipa. This is a pretty translucent radiated shell. 



Good living examples have been found at low water, 



opposite Birkdale. 

 Crenella discors. Rare. Has been found at low water, 



burrowing in A. digitatum. 



Nucula nucleus. Not common. Generally single valves 

 attached to bunches of coralline. A small dull olive- 

 coloured shell, the inside pearly white, and about twenty 

 minute teeth on the margin at one side of the hinge, and 

 ten at the other side. 



Leda caudata. Several specimens have been found on the 

 Birkdale shore. 



OSTREAD/E. 



Pecten maximus (the Great Scallop). Great numbers of this, 

 our largest British bivalve, are brought up by the 

 fishermen. 



Pecten opercularis (the Common Scallop, or Fan Shell). Not 

 uncommon, but generally small ; a handsome species, 

 varying much in colour, being sometimes yellow, orange, 

 crimson, brown, purple, white, or mottled. 



Pecten varius. Not commonly found, but on one occasion 

 ten or a dozen were picked up. 



Ostrea edulis (the Oyster). Not common on the shore ; 

 occasionally brought up by the fishermen. 



