142 



LAND AND FRESH WATER MOLLUSKS 



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. 



Corneocyclas (Cymatocyclas) compressa Prime. 



Pisidium compressum PRIME, Proc. Boston Soc. Nat. 

 Hist., iv, p. 164, 1851 ; 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- 

 FIG. 114. Corneocyclas 



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



Stewart River, Yukon District (Jide Sterki) . 



Corneocyclas variabilis Prime. 



Pisidium variabile PRIME, Proc. Boston Soc. Nat. Hist., iv, p. 163, 1851 ; 

 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) . 



Corneocyclas abdita Haldeman. 



Pisidium abditum HALDEMAN, Proc. Acad. Nat. Sci. Phila., i, 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 

 the ^^ Q{ thg 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. 



FIG. 115. Corneocy- 

 clas abdita Hald. 



