122 
The name is given for R. W. Coulthard, mining engineer. 
Horizon and Locality. In Bad Heart sandstone from east bank Smoky 
river, below Puskwaskau river and in fresh talus from same. In collection 
of Coulthard and Ponton, from 35 miles above mouth of Little Smoky on 
Smoky river. 
Type. Victoria Memorial Museum; holotype, Cat. No. 6104. 
Inoceramus selwyni n. sp. 
Plate XXI, figures 8, 9 
Equivalve, higher than long. Hinge-line considerably shorter than 
total length of shell; posterior border rounded below, oblique and nearly 
straight above, and concave at postero-dorsal angle; basal margin dis- 
torted, apparently rounded; anterior margin nearly straight, inclined 
inward above. Very tumid, maximum thickness in ventral half. Umbones 
prominent; beaks produced, incurved and curved forward, situated at 
anterior end of hinge-line. Surface deeply inflected anterior to beaks; 
surface somewhat depressed in postero-dorsal angle. Surface covered with 
strong concentric corrugations. 
Inoceramus erectus Meek 1 has a more nearly vertical anterior margin, 
more anterior beaks, a relatively longer hinge-line, and finer concentric 
undulations. 
The name is given for A. R. C. Selwyn, geologist and a former director 
of the Geological Survey. 
Length 57 mm., height 70 mm., thickness 87 mm. 
Horizon and Locality. In fresh talus of Bad Heart sandstone and 
concretions in shale just below Bad Heart sandstone from west bank 
Smoky river about 2^ miles below Puskwaskau river. 
Type. Victoria Memorial Museum; holotype, Cat. No. 6105. 
Inoceramus dunveganensis n. sp. 
Plate XX, figure 5 
Two specimens, moulds of the interior of the right valve, a little 
flattened by pressure, preserved. Somewhat oblique, a little higher than 
long. Hinge-line about one-half length of shell; anterior margin nearly 
straight, inclined at angles of 110 degrees to 115 degrees to hinge-line; 
ventral margin well rounded; posterior margin nearly straight, inclined 
at angles of 120 degrees to 125 degrees to hinge-line. Shell evenly and 
moderately convex; flattened in the postero-dorsal angle, narrowly inflected 
along the antero-dorsal border; umbones small, near the anterior end of 
hinge-line, but at about one-quarter distance from anterior end of valve. 
Surface covered with irregular, concentric, coarse undulations, more 
marked anteriorly and having a fairly strong ventral curvature. 
Length 120 mm., height 128 mm., thickness of a single valve 18 mm. 
1 U. S. G. Expl. 40th Par., IV, pt. I, p. 145, PI. 13, figs. 1, la, PI. 14, fig. 3. 
