THE NAUTILUS. 45 



Puncturella noachina galeata Gld. Orcas Island. 



Acmaea mitra Esch. Port Graham. 



Acmaea pelta Esch. Shore Orcas Island, Seward, Ellamar, Port 

 Graham. 



Acmaea patina Esch. Ballard Beach, Orcas Island, Ellamar, 

 Seward. 



Acmaea patina scutum Esch. Ballard Beach, Orcas Island, 

 Ellamar, Seward. 



Cryptobranchia concentrica Midd. Orcas Island, Ellamar, 

 Seward, Port Graham. 



Lepidopleurus cancellatus Sby. Port Graham. 



Tonicella lineata Wood. Orcas Island, Ballard Beach, Ellamar, 

 Seward. 



Tonicella submarmorea Midd. Orcas Island, 1 young specimen. 



Ischnochiton interstinctus Gld. Orcas Island. 



Ischnochiton mertensii Midd. Orcas Island. 



Ischnochiton (Radsiella) trifidus Cpr. Orcas Island. 



Trachydermon excelsus Gld. Port Graham. 



Trachydermon albus Linn. Port Graham. 



Trachydermon raymondi Pilsbry. Ellamar ; Port Graham. 



Mopalia acuta Cpr. Ellamar. 



Mopalia ciliata Sby. Orcas Island. 



Mopalia muscosa Gld. Ballard Beach. 



Mopalia muscosa hindsii Rve. Orcas Island. 



Mopalia muscosa lignosa Gld. Orcas Island ; Ballard Beach. 



Cryptochiton stelleri Midd. Shore Orcas Island. 



Tornatina eximia Baird. Orcas Island, a single specimen. 



Cylichna alba Brown. Ellamar, a single specimen. 



Haminea vesicula? Gld. Shore Orcas Island, a single specimen. 



Dentalium rectius Cpr. Orcas Island, taken in only one dredge 

 haul. 



Saxicava arctica Linn. Port Graham ; Ellamar. 



Mya arenaria Linn. Orcas Island, an introduced species. 



Mya arenaria alaskana Dall. Orcas Island, a single young speci- 

 men ; Port Graham, dead. 



Mya truncata Linn. Orcas Island, 3 valves. 



Cryptomya californica Conr. Ellamar. 



Pandora (Kennerlia) filosa Cpr. Orcas Island, not rare. 



Pandora (Kennerlia) grandis Dall. Orcas Island, 4 living 

 specimens. 



