- Catai^ogue; Recently Described Moleusca 189 



Ad^uscuEiuM errans (Lewis). 

 Cyclas errans Lewis, Uhi ? 



I,ewis (Pr. A. N. S. P., 1872, p. 105) says that he "proposed" this spe- 

 cies a number of years before, but that Prime considered it a synonym of 

 rosacenm. That from further study, he is "induced" to reclaim his species. 

 I have been unable to find any other reference to the species. 



Genus PISIDIUM C. Pfeiffer, 1821. . 



The use of Corncocyclas Fer. for this genus proposed by Dall (30, p. 7 

 and 29, p. 1459) is disputed by Woodward (165, p. 367 and 166, p. i) and 

 has not been followed by Sterki (125, p. 473) and until the question has 

 been definitely settled, it seems preferable to use the name that has been in 

 common use for so many years. 



PisiDiuM borEalE Westerlund. 



Pisidium horeale Westerlund, Kongl. Sv. Vet. Ak. Forh., 1877, p. 70, fig. 23. 



Type locality : Lusino, Siberia. ? Port Clarence, Alaska. 



Pisidium caeiEornicum (Newcomb ?). 



Listed by Berry (Naut., XXIII, 1909, p. 79) from Bluff Lake, San Ber- 

 nardino Co., Cal. I have not been able to find any other reference to it. 



Pisidium compressum limnicoeum Sterki. 



Pisidium compressum Umnicolum Sterki, Naut., XIX, 1905, p. 8r. 



Type locality : Fox River, Wis. 



Pisidium compressum smithii Sterki. 



Pisidium compressum smithii Sterki, Naut., XIX, 1905, p. 83. 



Type localitv : Shoal Creek, Ala. 



Pisidium noveboracense proclive Sterki. 



Pisidium noveboracense proclive Sterki, Naut. XIX, 1506, p. 119. 



Type locality : New Philadelphia, O. 



Pisidium obtusalE C. Pfeiffer. 



This European species has been listed from near Lake James, Steuben 

 Co., Ind. by Sterki (Naut, XVII, 1903, p. 43). 



Pisidium sibiricum Westerlund. 



Pisidium sibiricum Westerlund Nachr. Blatt. Gess. 1876, p. 103; Clessin, 



Con. Cab., Cycladeen, 1877, p. 66, pi. VII, figs. 15-17. 

 Type locality: Yenesei River, Siberia. 



? Port Clarence, Alaska according to Dall (^2, p. 144). Dall's reference 

 for this species in K. Svenska Vet. Ak. Forh. is erroneous. It should be 

 p. 69, fig. 21, not p. 70, fig. 23. 



