Mollusks ll A 



STATION 54e. 

 Beach at Pauline cove, Herschel island, Arctic coast, Yukon Territory, Canada. 



Macoma balthica L. 

 Astarte borealis Schum. 

 Astarte polaris Dall. 

 Astarte alaskensis Dall. 

 Cyrtodaria kurriana Dkr. 

 Saxicava arctica Linne. 

 Tachyrhynchus erosus Couthouy. 

 Natica clausa Brod. & Sby. (fragm.). 



STATION 60a. 

 Beach at Orca, Prince William sound, Alaska. 



Mytilus edulis L. 



Macoma incongrua v. Marts. 



Macoma inquinata Desh. 



Cardium corbis Martyn. 



Saxidomus giganteus Desh. 



Protothaca staminea Conrad. 



Saxicava arctica L. 



Thais lamellosa Gmelin. 



Littorina sitkana Philippi. 



Acmceea scutum Esch., var. patina Esch. 



Acmaa pelta Esch. 



Lake at Konganevik, Camden bay, Alaskan Arctic coast. 



Aplexa hypnorum L. 



Agriolimax hyperboreus Westerlund. 



Lake at Demarcation point, Alaskan Arctic coast. 

 Aplexa hypnorum L. 



Pond on Herschel island, Arctic coast, Yukon Territory. 

 Aplexa hypnorum L. 



Pond at Collinson point, Alaskan Arctic coast. 

 Aplexa hypnorum L. 



Brackish pond near Teller, Grantley harbour, Alaska. 

 Aplexa hypnorum L. 



Iglukitaktok, Mackenzie river delta. 

 Limncea stagnalis L. var. appressa Say. 



Tundra, at Nome, Norton sound, Alaska. 



Succinea chrysis Westerlund. 

 Agriolimax hyperboreus Westerlund. 



Grantley harbour, Alaska; (stomach of Pleuronectes) . 



Fragments of Yoldia, Serripes, Leda, and other thin bivalves. 

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