124 
H orizon and Locality . Sixty to 70 (estimated) feet above the base of the 
Kaskapau member of Smoky River formation, exposed on east bank of 
Smoky river at rapid above railway bridge. Fresh talus from same 
locality. 
Types. Victoria Memorial Museum; holoytpe, Cat. No. 6108; para- 
type, Cat. No. 6109. 
Pecten silentiensis n. sp. 
( Silentia, the Peace country) 
Plate XXII, figures 1, 2; Plate XXIII, figure 8 
Large; suborbicular; inequivalve, the left valve moderately inflated, 
the right valve fairly convex to somewhat compressed, but in all specimens 
the right less inflated than the left. Beak and umbo of moderate size 
in left valve, hardly rising above hinge-margin; beak and umbo not well 
defined in right valve. Hinge-margin comparatively short. Antero- 
dorsal margin in both nearly straight; these margins meet at angles of 
about from 135 to 145 degrees. Ears long, narrow; the anterior in right 
valve the widest and having a shallow byssal notch. Areas of both valves 
narrow. Surface covered with irregular lines of growth; no radial orna- 
mentation observed. 
Length of holotype 93+mm., height 98 mm., thickness 29 mm. 
Pecten conradi (Whitfield) 1 from the Merchantville of New Jersey 
is much smaller, has radiating sculpture although faint, proportionately 
larger ears, smaller apical angle, and more nearly equal valves. Pecten 
clijffwoodensis Weller 2 from the Cliffwood of New Jersey is smaller, more 
depressed, has relatively wider ears, and a smaller apical angle. Pecten 
burlingtonensis Gabb 8 from the Merchantville, Woodbury, and Wenonah 
of New Jersey, has wider ears, a smaller apical angle, and fine radiating 
striae. Pecten nillsoni Goldfuss 4 from the Cretaceous of Texas is smaller, 
has a slightly smaller apical angle, and somewhat wider and larger ears. 
Pecten siederensis Kniker 6 from the Buda limestone of Texas is much 
smaller, more equivalve, thinner, and has a smaller apical angle and more 
triangular ears. 
Horizon and Locality. Fresh talus of Bad Heart sandstone on east 
bank Smoky river below mouth of Puskwaskau river. Fresh talus 
of Bad Heart sandstone from east bank of Smoky river about 1^ miles 
below Puskwaskau river. Talus on south bank Smoky river, about 2 
miles below Bad Heart river; probably from the Bad Heart sandstone. 
Talus from north bank of Smoky river, about 4 miles below mouth of 
Bad Heart river; probably from the Bad Heart sandstone. 
Type. Victoria Memorial Museum; holotype, Cat. No. 6110. 
1 Geol. Surv., N.J.,Pal.,4, 1907, p.474, PI. 60, figs. 1-4. 
* Geol. Surv., N. J., Pal., 4, 1907, p. 469, PI. 60, %s. 7-8. 
* Geol. Surv., N. J., Pal., 4, 1907, p. 470, PI. 49, figs. 64. 
4 Boemer, F., Kreidebildungen von Texas, Bonn, 1862, p. 67, Taf. 8, fig. 6. 
* Bull. Univ. Texas, No. 1817, 1918, p. 16, PI. 1, figs. 6-6. 
