6 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Eye-Grass flat, Old ^ian Eiver, G-. M. Dawson, 1881, and T. C. 

 Weston, 1883, not uncommon ; in basal beds of St. Mary Eiver Series. 

 Ujiper Belly Eiver, twenty-two miles above the mouth of the Waterton, 

 E. G. McConnell, 1881 ; St. Mary Eiver Series : one valve. 



Perhajjs a variety of the preceding species, as suggested by Dr. C. 

 A. White. 



Unio Dan.e, Meek and Hayden. 



Unio Damr, Meek and Hayden. 18.57. Proc. Ac. Nat. Sc, Phil., vol IX, p. 145. 

 " :Meek. 1876. Rep. U.S. Geol. Surv. Terr., vol. IX., Rep. Inv. Cret. 

 and Tert. Foss. V. Miss. Cy., p. 517, pi 41, figs. 13, a, b, c. 



Bow Eiver, mouth of East Arrow-wood Creek (base of section), also 

 Bow Eiver, four and eight miles west of Blackfoot Crossing, G. M. 

 Dawson, 1881 ; St. Alary Eiver Series. 



Belly Eiver, west of crossing of MacLeod-Benton Trail, and Little 

 Bow Eiver, five miles below crossing of Blackfoot Trail, E. G. Mc- 

 Connell, 1881 ; St. Mary Eiver Series. 



Pincher Creek, T. C. Weston, 1883 ; St. Mary Eiver Series. Knee 

 Hills Creek, Township 29, Eange 22, west of 4th Principal Meridian, 

 .T. B. Tyrrell, 1884. 



In a conversation with the writer. Dr. C. A. White expressed the 

 opinion that tlie Unio Dance, U. suhsjmtulatus and U. Dciveyanus of Meek 

 & Hayden are all varietal forms of one species, and it is upon this 

 hypothesis that the fossils from the above mentioned localities are all 

 referred to U. Dana: Some of these specimens from the Canadian 

 Xo^th-we^t are fairly ty]jical representatives of the U. Dance ; some 

 again are more like U. siibspatulatus, while others possess characters 

 apparently intermediate between these two varieties or nominal 

 .species. 



Unio senectds. White. 



Uiilo sencctv-", Wliite. 1877. Bull. IT.S. Geol. Surv. Terr., vol. III., p. (lOO. 



- ''-. l,*'^'"-'-, "'^'■^- Geol. yuvv., Contr. to Pal., Nos. 2-8 p. 69 pi 

 i'8,tigs. 1 a, b, c. ' L , f 



White. 1883. Eev. N.in-Marine Foss. Moll. X. Am. p 2(i nl 19 

 figs. 1,2. ' '■ ' ' ^ 



Bow Eiver, two miles below the mouth of Jumping Pound Eiver, 

 G. M. Dawson, 1881: three imperfect but characteristic casts two of 



