Il8 A HANDBOOK FOR SOUTHPORT. 



district to be, the collection may be considered a very fair 

 proportion of the whole British Conchology, which comprises 

 about 600 species. 



MARINE SHELLS (BIVALVES). 



ACEPHALA LAMELLIBRANCHIATA. 



PHOLADIDjE. 



Pholas crispata. Rare; small living specimens have been 

 found in pieces of rotten wood washed up by the tides, 

 and large single valves occasionally. The nearest habitat 

 for this species is Hilbre Island, at the mouth of the 

 Dee, where fine living specimens may be found burrow- 

 ing in the red sandstone rock at extreme low water. 



Pholas Candida. Occasionally washed up alive, during very 

 heavy gales ; single valves common at all times. 



GASTROCH/ENID/E. 



Saxicava rugosa. Very rare ; has been found burrowing in 

 pieces of the zoophyte Alcyonium digitahtm, and also 

 attached to Modiola Modiolus when brought up from 

 deep water by the fishermen. 

 MYAD/E. 



Mya truncata. Not uncommon. Fine specimens may some- 

 times be taken at extreme low water, during high spring 

 tides. 



Mya arenaria. Single valves are not uncommon ; perfect 

 shells very rare. 



CORBULID/E. 



Corbula nucleus (the little basket). Occasionally found at 

 high water mark, and on slopes of banks nearer low 

 water. One valve is larger than the other ; the smaller 



