FAMILY SPH^ERIID^E 145 



* Corneocyclas randolphi Roper. 



Pisidium randolphi ROPER, Nautilus, IX, p. 99, Dec., 1895. 



Range. Seattle, Washington. 



This species is finely striated, very much like C. abdita in general 

 form, but of a peculiar and unique greenish-yellow color. It may 

 very likely extend into British Columbia. 



Corneocyclas (Tropidocyclas) henslowana Sheppard. 



Tellina henslowana SHEPPARD, Trans. Linn. Soc., xiv, p. 150, 1825. 

 Cyclas appendiculata (LEACH MS.) TURTON, Man., ed. i, p. 15, pi. xv, fig. 

 6, 1831. SOWERBY, in Richardson, Fauna Bor. Am., in, p. 316, 1836. 

 Pisidium henslowianum JENYNS, Mon. Cyclas, p. 20, pi. xxi, figs. 6, 7, 1832. 



Range. Europe north of the Alps ; Canada; British America. 



Hamilton Bay, Lake Ontario ; Lake Superior to Lake Winnipeg 

 ( Richardson) . 



The record from Richardson was naturally thought to be a misiden- 

 tification, but the recent discovery in Lake Ontario of undoubted speci- 

 mens of this species, leads to the belief that Sowerby, who certainly 

 should have known a common British species, may after all have been 

 correct. 



In closing the list of Sphceriidce I may be allowed to observe that 

 so large a part of it is derived from the literature, and not from the 

 present examination of specimens, that I do not feel the confidence in 

 the validity of all the species, or the correctness of all the identifica- 

 tions that I might have felt under other circumstances. Until the very 

 numerous species which have been named among American Pisidia of 

 late years, shall have been adequately illustrated and some knowledge 

 gained of the range of variation in these minute forms, a healthy skep- 

 ticism in regard to our population of this genus will doubtless continue 

 to prevail among collectors of fresh water shells. 



