46 THE NAUTILUS. 



Pandora (Clidiophora) punctata Cpr. Ellamar, young. 



Lyonsia californica Conr. Orcas Island, single valve. 



Agriodesma saxicola Baird. Orcas Island. 



Mytilimeria nuttalli Conr. Orcas Island, very large specimens in 

 masses of the common Tunicate Cynthia haustor. 



Mactra (Spisula) alaskana Ball. Cordova ; Alaska and Ellamar. 



Schizothaerus nuttalli Conr. Shore Orcas Island, very large ; 

 Ellamar. 



Tellina (Angulus) buttoni Dall. Ballard Beach. 



Moerella salmonea Cpr. Ballard Beach. 



Macoma balthica Linn. Orcas Island ; Ellamar. 



Macoma calcarea Gmelin. Orcas Island. 



Macoma carlottensis Whiteaves. Ellamar, one young specimen. 



Macoma incongrua von Martens. Port Graham. 



Macoma inconspicua Brod. & Sby. Orcas Island ; Ballard Beach ; 

 Ellamar. 



Macoma inflatula Dall. Orcas Island. 



Macoma inquinata Cpr. Orcas Island ; Sucia Island ; Ellamar. 



Macoma leptonoidea Dall. Orcas Island. 



Macoma nasuta Conr. Ballard Beach; Shore Orcas Island, very 

 common. 



Macoma secta Conr. Ballard Beach. 



Saxidomus giganteus Desh. Ballard Beach, shore and dredged ; 

 Orcas Island ; Ellamar ; Port Graham. 



Marcia kennerleyi Rve. Orcas Island. 



Marcia (Venerella) subdiaphana Cpr. Orcas Island. 



Psephidia lordi Baird. Orcas Island ; Ellamar. 



Paphia (Protothaca) staminea Conr. and varieties. Orcas Island ; 

 Sucia Island ; Ellamar. 



Pisidium occidentale Bourg. ? In bogs at an elevation of about 

 1000 feet on Mt. Constitution, Orcas Island. 



Cardium (Cerastoderma) californiense Desh. Orcas Island. 



Cardium (Cerastoderma) corbis Mart. All points visited. 



Serripes groenlandicus Gmel. Orcas Island. 



Phacoides tenuisculptus Conr. Orcas Island. 



Axinopsis sericata Cpr. Orcas Island ; Ellamar. 



Erycina compressa Dall. Ellamar, dead on shore. 



Erycina rugifera Cpr. Orcas Island. All specimens taken were 

 attached to the ventral surface of the so-called Sea Mouse, Aphro- 



