144 LAND AND FRESH WATER MOLLUSKS 



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

 tion of C. abdita Haldeman. 



Corneocyclas 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 FIG. 1 1 8. 

 Columbia. Corneocyclas 



ultramonta- 



Corneocyclas arctica Westerlund. Prime. 



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

 Range, Port Clarence, Alaska. 



Corneocyclas nivalis Westerlund. 

 Pisidium nivale WESTERLUND, op. tit., p. 218, 1885. 

 Range. Port Clarence, Alaska. 



Corneocyclas glacialis Westerlund. 

 Pisidium glaciale WESTERLUND, 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. n, pi. vn.figs. 15-17, 1877. WESTER- 

 LUND, Fauna Pal. Reg., vn, 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., vn, p. 32, 1890. 



Range. Western Siberia at Lusino. PPort 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 new species, among the three nominal species preceding them. 



Corneocyclas pulchella Jenyns. 



Cyclas pulchella JENYNS, Trans. Phil. Soc. Cambridge, 1832, p. 306, pi. x, 

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

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



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

 America ? 



Methy Lake, Athabaska (Richardson). 



