67 — 



WHERE TO LOOK FOR THE BIVALVES HERE TREATED 



The follow ing list summarizes what has been said in regard to the 

 habitat of the various sjiecies. It should be used in connection with 

 the foregoinii' list of localities or the range as given under each 

 species. Less important or less characteristic species are in brackets. 



SPECIES FOUND IN THE OCEAN OR OPEN BAYS 



Attached to exposed rocks: 



Sea jimssol 

 Attached to rocks in partially sheltered positions: 



Rock oysters 



Rock scallop 

 In burrows in exposed or partially sheltered soft rocks: 



Borers 

 Burrowing in exposed small sand or gravel beaches: 



Rock cockle (Paphia) 



Psammohia 



[Washington clam] 



■[Gaper] 

 Burrowing in exposed pure sand beaches: 



Pismo clam 



Razor clam 



Wedge-shell 



Sea cockle ( Amiantis^) . usuall.v below low tide 



Tellen ' 



White sand clam {Macoma secta) 



[Cockle] (Carclium corbis) 



SPECIES FOUND IN ENCLOSED BAYS 



Attached to solid objects — rocks, shells, piles: 



Bay mussel 



Oyster 

 In burrows In hard clay, etc.: 



Borers (chiefly Zirfaea) 



Platyodon 



[Gaper] 

 Burrowing in gravel or coarse sand: 



Rock cockle (Paiihia) 



Purple clam (SanffuivoUiruO 

 Burrowing in sand: 



Wliite sand clam (Mhcodki .spctn) 



Cockle (Cardinm corbis) 

 Burrowing in muddy sand: 



Soft-shell (MjKi) 



Rock cockle (P(ti)Ma) 



Washington clam 



Gaper 



Hard-shell cockle (Chionc) 



Cockle (Cardinm corbis) 



Horse mussel 



Jackknife clam 



Piddock (Zirfaea) 

 [Bent-nosed clam] (Macoma nasuta) 



Panope 

 Burrowing in mud: > 



Soft-shell 



Bent-nosed clam 



Jackknife clam 



Horse mussel 

 On surface of sand, gravel or mud if not too soft but not in channels where current 

 is strong-: 



Scallop 



[Cockle] (Cardinm corbis) 



[Rock cockle] (Paphia staminea) 



[Hard-shell cockle] (Chione) 



SPECIES FOUND IN BRACKISH WATER 



Burrowina in mud: 



Soft-shell 

 Bent-nosed clam 



