144 



LAND AND FRESH WATER MOLLUSKS 



Fig. Ill 



This unfigured species has been regarded by Roper as only a muta- 

 tion of C. abdita Haldeman. 



Comeocyclas ultramontana Prime. 



Pisidium ultramontanum Prime, Mon. Am. Corbie, p. 75, 

 fig. 85, 1865. 



Range. — Canoe Creek, California ; Seattle, Wash. ; 



Nanaimo, Vancouver Island, and Pender Island ! British 

 r^ ■, , . Corneocyclai 



Columbia. ,^ •' ^ 



ultramonta- 



Comeocyclas arctica Westerlund. na Prime. 



Pisidium arcticum Westerlund, Vega Exp. Vetens. lakt., iv, p. 217, 1885. 

 Range. — Port Clarence, Alaska. 



Corneocyclas nivalis Westerlund. 

 Pisidium niva/e Westkriajhd, op. cit., p. 218, 1885. 

 Range. — Port Clarence, Alaska. 



Corneocyclas glacialis Westerlund. 

 Pisidium ^/aciale 'Westkki.U'SD, op. cit., p. 218, 1885. 

 Range. — Port Clarence, Alaska. 



* Corneocyclas sibirica Clessin. 



Pisidium sibiricum Clessin, K. Svenska Vet. Ak. Forh., p. 70, fig. 23, 1877 ; 

 Mon. Pisidium, Conch. Cab., ed. 11, pi. vii,figs. 15-17, 1877. — Wester- 

 lund, Fauna Pal. Reg., vii, p. 23, 1890. 



Range. — Western Siberia, on the Yenisei River to 60° 50' N. Lat., 

 } Port Clarence, Alaska. 



* Corneocyclas borealis Clessin. 



Pisidium boreale Clessin, in Westerlund, Fauna Pal. Reg,, vii, p. 32, 1890. 



Range. — Western Siberia at Lusino. .?Port Clarence, Alaska. 



The preceding five species are ascribed to Port Clarence on the 

 authority of the literature solely. I have not seen specimens of any 

 of them. I suspect that the C. sibirica and borealis reappear in the 

 form of newr species, among the three nominal species preceding them. 



Corneocyclas pulchella Jenyns. 



Cyclas pulchella Jenyns, Trans. Phil. See. Cambridge, 1832, p. 306, pi. x, 

 figs., 1812; not of Deshayes, 1835, nor Gassies, 1849. — Sowerby, in 

 Richardson, Fauna Bor. Am., ill, p. 316, 1836. 



Range. — Middle and Northern Europe to 69° N. Lat. Arctic 



America ? 



Methy Lake, Athabaska (Richardson). 



