08 CONTRIBUTIONS TO CANAIIIAN PALAEONTOLOGY. 



valves which are all quite empty and show the hiQge dentition, muscu- 

 lar imiJi-essions and the small shallow subangular pallial sinus very 

 clearly. 



The specimens from this locality are slightly different in shape from 

 those from the " AYestern Laramie ' mentioned on page 1, but the Oor- 

 biculce from the Milk Eiver are also almost exactly intermediate in 

 their characters between C. occiJentalis and C. cytheriformls. 



Sph,eriu5I PORMOSi'M ? Meek and Hayden, Yar. 



(A description of this shell, with relcrences to the publications in 

 which ;S'. formosum was described, will be found on page 61.) 



Belly Paver, east side of Driftwood Bend, G. M. Dawson, 1881. 

 Suuth Saskatchewan, one mile below the mouth of the Bow Eiver, T. 

 0. Weston, 1883. A few single valves from each of these localities. 



CoRBULA suBTR[C40NALrs, Steele and Hayden. 



Corhula RiiMrigonoMn, Mcok and Hayden. is."i6. Pvoc. Ac. Nat. Sc. Phil., vf)l- 



VIII. p. 116. 

 Corbula {Pvlimioviija) suhtngonalis, Meek and Hayden. 1860. lb-, vol. XII., p. 432. 

 Corhula xnhli'lr/onalix, Meek. 1876. Eep. TT. S. Geol. Surv. Terr., vol. IX., p. 529 



pi. 40, figs. 3, a, b. 



White (as of Murk). Lssd. ('. S. Geol. Surv., Contr. to 



Pal., Xos. 2-S. p. so, pi. 2,'i, figs. 6, a, b, c, d, e. 



White. 1883. Rev. Nou-Maiinc Foss. N. Am., p. 36, pi. 

 19, figs. 11^15. 



Belly Eiver, east side of Driftwood Bond, and Belly Eiver near its 

 junction with the Bow Eivei-, G. M. Dawson, 1881. South Saskat- 

 chewan, six miles below the mouth of Bow Eiver and thii'ty-tivc feet 

 above the watei- level, <r. M. Dawson, 1881. North side of Milk Eiver, 

 five miles below P;Vkow-ki Coulee, and south side of Milk Eiver, one 

 mile above the mouth of Pa-kow-kl (_'(j\dee and forty feet above the 

 water level, G. M. Dawson, 1881. 



South skle of the Saskatchewan, one mile below the mouth of the 

 Bow Eiver, T. C. Weston, 1883. Abundant at each of these localities. 



