142 



LAND AND FRESH WATER MOLLUSKS 



Fig. 114. Comeocyclas 

 variabilis Prime. 



Kotzebue Sound, Alaska ! in marl associated with mammoth bones, 

 at Elephant Point. Bering Island, Bering Sea ! 



The specimens above referred to were identified for me by Mr. 

 Prime. 



Comeocyclas (Cymatocyclas) compressa Prime. 



Pisidium compression Prime, Proc. Boston Soc. Nat. 

 Hist., iv, p. 164, 185 1 ; Mon. Am. Corbie, p. 

 64, figs. 67-68, 1865. 



Range. — Maine to California ; Canada, the 

 Yukon. 



Lake Superior, near Ignace Id., in 4-6 

 fathoms ; White Pine, Nevada ; Sierra Nevada 

 to 9,000 feet near Summit, Calif. ; Ventura 

 Co., Calif. ; Vancouver Island, British Colum- 

 bia (Raymond) ; Green Lake, Seattle, Wash. ; 

 Stewart River, Yukon District (Jide Sterki). 



Comeocyclas variabilis Prime. 



Pisidium variabile Prime, Proc. Boston Soc. Nat. Hist., iv, p. 163, 185 1 ; 

 Mon. Am. Corbie, p. 66, figs. 69, 70, 1865. 



Range. — Eastern United States, north of Virginia ; Colorado, and 

 northward; Seattle, Wash. 



Pine Creek, Manitoba ; Stewart River, Yukon District {Jide Sterki) . 



Comeocyclas abdita Haldeman. 



Pisidium abditum Haldeman, Proc. Acad. Nat. Sci. Phila., 1, p. 53, 1841. — 

 Prime, Mon. Am. Corbie, p. 68, figs. 72, 73, 1865. 



Range. — North America, from Honduras northward to Alaska. 

 Marl Lake, Anticosti ! Lake Superior in 4 to 13 fathoms near 

 Ignace Island ; Manitoba ; Assiniboia at Qu'Appelle ! Alberta, at 

 Laggan, Red Deer, Olds, McLeod, Battle River, up to 5,200 feet 

 elevation ; east slope of the Sierra Nevada up to 

 7,100 feet; in Colorado up to 9,300 feet; west 

 slope of the Sierra below 5,300 feet in Califor- 

 nia ; Seattle, Wash. ; in Alaska at Seldovia, Cook 

 Inlet ! Coal Harbor ! Unga Island, Shumagins, 

 in small pools on the tundra ; Akun Island ! 

 Aleutians ; the Yukon River, 30 miles below 



Fig. 115. Comeocy- 

 clas abdita Hald. 



the mouth of the Tanana ! and Bering Island, 

 Bering Sea ! 



This is the most common and widespread species, out of the 

 varieties of which many nominal species have been made. 



