Mollusks . , 5 A 



The portions of the Arctic region which may be reached with relative ease 

 have been so thoroughly explored for mollusks that little hope is justified for 

 the discovery of undescribed species. It is therefore gratifying that the work 

 of the members of the expedition has been what is rfeally unexpectedly successful 

 in this line. 



I have to thank the authorities in Canada, for the care they have taken 

 to do everything that might Hghten my labour in preparing this report, and 

 the Direction of the United States National Museum for the free use of all 

 their facihties duriag its preparation. For the accuracy of the station numbers; 

 Mr. Johansen is solely responsible. 



-List of Species collected West of the Delta op the Mackenzie 



River. 



Nucida tenuis Montagu, 23^ 



Leda (Portlandia) arctica Gray, 23, 27s. 



Leda minuta Fabricius, 23. 



Leda pernula, 23. 



Leda radiata, Krause, 23. 



Leda intermedia Sars, 206-c, 20d. 



Leda collinsoni Dall, 27s. 



Yoldia myalis Couthouy, 23. 



Yoldia limatula Say, 23 (+ hyperborea Loven.) 



Mytilus edulis Linn6, 206-c; 2Qd, 24, 60a, 20^. 



Musculus Icevigatus Gray, 27s, 281, 24, 23. 



Musculus niger Gray, 24. 



Crenella aff. rotundata Dall, 27s. 



Pandora sp., 27s. 



Lyonsia arenosa Moller, 27s, 24. 



Astarte horealis Schumacher, 23, 24, 26, 27s, 28i, 28i, 54e. 



Astarte polaris Dall, 54e. 



Astarte alaskensis Dall, 54e. 



Cardium californiense Deshayes, 206-c; 20d, 20g. , 



Cardium corbis Martyn, 60a. 



Cardium ciliatum Fabricius, 23. 



Serripes gronlandicus Gmelin, 20d, 23, 24. 



Serripes laperousei Deshayes, 22. 



Saxidomus giganteus Deshayes, 60a. 



Protothaca staminea Conrad, 60a. 



Liocyma beckii Dall, 23, 24, 27s. 



Tellina (Peronidia) lutea Gray, 20d, 20g. 



Macoma calcarea Gmelin, 23, 24. 



Macoma incongrua Martens, 20d, 60a. 



Macoma inquinata Deshayes, 60a. 



Macoma moesta Deshayes, 24. 



Macoma balthica Lihn^, 54e, 20d. 



Macoma inconspicua Broderip & Sowerby, 20b-c, 20d, 20g, 24. 



Spisula polynyma Stm. var. alaskana Dall, 20fir, 20to. 



Mya truncata Linn6, 23, 24. 



Mya intermedia Dall, 20d, 24. 



Saxicava arctica Linn6, 20d, 23, 24, 60a. 



Cyrtodaria kurriana Dunker, 2M, 26, 27s, 54e. 



Zirfcea gabbi Tryon, 24. 



Coryphella cf. salmonacea Couthouy, 20^. 



'The numbers refer to the number of the Collecting Station. See page 7a, et seo • 



