Mollusks 



25 A 



End of June- 

 Begininng of 

 July. 

 1915. 

 August. 



at the southwest end of the same lake; up in this creek I also 

 collected many living Lymncea and Aplexa. 



The fresh-water shells Aplexa and Physa collected by D. 

 Jenness east of Bernard Harbour. 



Victoria island, Northwest Territories, Canada: The following 

 fresh-water snails were collected by D. Jenness: 



1. From lakes near point Williams, August 8, 1913: Lymncea 



vahli and Valvata lewisii. 



2. From lakes near Mt. Arrowsmith, m ddle of August: 



Lymncea vahli. 



3. From pond inland near Point Williams, August 15: Aplexa. 



4. From creek between cape Kendall and Cape Baring, August 



31: Aplexa hypnorum; Lymncea vahli. 



The Eskimo (Coronation Gulf dialect) name for these Lymncea 

 and Valvata is "Siuterkok" (derived from the word for ears). The 

 same name is used for Buccinum and other snails. 1 



The common, small fresh-water clam (Pisidium rotundatum) 

 is called " Uvillunniak " ( = the small clam) by the Coronation 

 Gulf Eskimo. Marine bivalves called "Uvillok." 2 



*Any spiral molluscs are called siutukayuk in Mackenzie Eskimo dialect. R. M. Anderson. 

 2 Also called uvillok in Mackenzie dialect; abjait in Kotgebut Sound dialect. R. M. Anderson. 



REFERENCES TO PLATES. 



PLATE I. 

 Fig. 1. Volutopsius stefanssoni Dall, nat. size; p. 22A. 



Fig. 1. 

 Fig. 2. 

 Fig. 3. 

 Fig. 4. 

 Fig. 5. 

 Fig. 6. 

 Fig. 7. 



Fig. 8. 



Fig. 1. 



PLATE II. 



Macoma oneilli Dall, nat. size; p. 20A. 



Physa jennessi Dall, X 3; p. 20 A. 



Leda (Portlandia) collinsoni Dall; inside view, nat. size; p. 19A. 



The same, outside view; p. 19A. 



Margarites ecarinatus Dall, upper surface, magnified one half; p. 22A. 



The same in profile. 



Pseudamusium andersoni Dall, left valve, nat. size; the dark center of the disk is the 



remains of the animal matter; p. 19A. 

 The same, right valve. 



PLATE III. 

 Plicifusus johanseni Dall, X 2 ; p. 21 A. 



