38 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



one perfect and beautifully preserved ispecimen, with the test preserved 

 on both valves and entirely freed from the matrix. 



YoLDiA sciTULA, Meek and Hayden. 

 PI. 5, fig. 2. 



Nvcula scltula, :\Ieek and Haj'den. 18.56. Proc. Ac. Xat. Sc. Phil., vol. VIII., p. 84.. 

 Leda sdiula, :\Ieek and Hayden. 1860. lb., vol. XII., p. 185. 

 Lola {YoMia) scitula, 31. and H. 1860. lb., p. 428. 



YoMla mtula, INIeek. 1876. Eep. U.S. Geol. Surv. Terr., vol. IX., p. 110, pi. 28, 

 fig. 9. 



Twelve miles east of "White Mud Eiver, on trail to Woody Mountain, 

 one well preserved right valve, and 49th Parallel, on the east branch 

 of the Poplar Pdver (the place called " Woody Mountain Astronomical 

 Station" on page 107 of Dr. Dawson's Eeport on the Geology and 

 Eesom-ces of the Country in the Vicinity of the 49th Parallel) : a mould 

 of the exterior of a left valve : both collected by G. M. Dawson in 1874, 

 while on the staff of H.M. l^orth American Boundary Commission. 



The identification of these two specimens is not entii-ely satisfac- 

 tory, their characters agreeing better with Meek's descriptions than 

 with his figures of Y. scitula. Meek's latest statement in regard to 

 that shell is that its posterior side is ''subangular or very narrowly 

 rounded in outline, ' but in the figure the posterior side is represented 

 as subangular above. In both of the specimens collected by Dr. 

 Dawson the posterior side is very narrowly rounded, both above and 

 below, and there is no trace of anj- angularity above. 



ToLDiA EvANSi, Meek and Hayden. 



Nvmla Eraimi, INIeek and Hayden. 18.56. Proc. Ac. Nat. Sc, Phil, vol- VIII 



p. 84. 

 Leda Emnsi, Jleek and Hayden. 18G0. lb., vol. XII, p. 1S5. 

 Leda ( Yuldia) Eransi, IMeek and Hayden. 1860. lb., p. 429. 

 Yoldia Eraiixi, 3Ieek. 1876. Eep. U.S. Geol. Surv. Terr., vol. IX, p. Ill, pi. 28. 

 * figs. 10, a, b, c. 



South Saskatchewan, fifteen miles west of the mouth of Swift Current 

 Creek, E. G. McConnell, 1882: a single right valve. Old Wives 

 Creek, Township 10, Eange 11, west of 3rd Principal Meridian, E. G. 

 McConnell, 1884; several imperfect and not very well preserved 

 specimens. 



