125 
Modiolus silentiensis n. sp. 
(Silentia, the Peace country) 
Plate XXIII, figures 3, 4 
EIod gate-oblique, slightly curved, contracted anteriorly, and rounded 
posteriorly. Hinge-line more than half length of shell; anterior margin 
short, rounded; an tero- ventral margin long, slightly concave, inclined 
to hinge-margin at angle of about 48 degrees; ventral margin short, rounded; 
posterior margin long, rounded, almost straight above. Beaks incon- 
spicuous, almost terminal. Post-umbonal ridge rounded, curved, widening 
and flattening out postero-ventrally; from this ridge the slope is steep 
to the antero-ventral margin. Surface covered with fine, somewhat 
irregular, concentric striae. 
Height 13-5 mm., length 16*0 mm. 
Other specimens are more oblique in outline; in them the hinge-margin 
is relatively longer and the posterior margin is shorter. 
Modiola meeki E. and S. 1 has the beaks not quite so anterior in position, 
is larger on the average, has a lesser angle between the hinge and the 
antero-ventral margins and has a more elongate and slender outline. 
Horizon and Locality. In landslide talus of Dunvegan formation on 
north bank Peace river about 6 miles west of mouth of riviere au Brftl6. 
Slide talus of Dunvegan formation south bank Peace river, about 4 miles 
west of mouth of riviere au Brfil6. Landslide talus, Dunvegan formation, 
north bank Peace river about 3 miles west mouth of riviere au Brftl6. 
Types . Victoria Memorial Museum; holotype, Cat. No. 6190; para- 
type, Cat. No. 6112. 
Corbicula dowlingi n. sp. 
Plate XXIII, figures 1, 2 
Small, equivalve, suborbicular, somewhat compressed. Hinge- 
margin curved a little; anterior, ventral, and posterior margins well 
rounded. Shell moderately convex; umbones small, directed forward, 
situated a little in advance of the middle. Ligament external, long. Sur- 
face covered with even, well-marked concentric striae. Preparation of hinge 
of right valve shows three cardinal teeth, the anterior the smallest; long, 
double, anterior lateral; long posterior lateral, double? 
The species name is given for D. B. Dowling of the Geological Survey. 
Height 21 mm., length 43*5 mm., thickness 10 mm. 
Horizon and Locality. In landslide talus of Dunvegan sandstone, 
west bank Peace river, 5 miles below mouth of Montagneuse river. 
Type. Victoria Memorial Museum; holotype, Cat. No. 6191. 
Rhytophorus? caurinus n. sp. 
(< Caurus , the northwest wind) 
Plate XXIII, figure 5 
Stout, subfusiform. Short, conical spire about 0*25 of total length. 
Five whorls. Suture impressed. Whorl shouldered and tapering anteriorly. 
Surface covered with fine striae and ridges of growth. 
» U. 8. G. S. Terr., 1878, p. 72, PI. 15, figs. 3 a-c. 
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