123 
Compared with Inoceramus crippsi var. reachensis Etheridge 1 our 
species is much larger, is more oblique, and has more irregular concentric 
sculpture. Compared with the typical Inoceramus labiatus (Schlotheim) 2 , 
our species is not so oblique, is not so elongated between the umbo and the 
postero-ventral extremity, is larger, has more irregular concentric sculpture 
and the ventral curvature of the concentric undulations is not so strong. 
A similar but much larger species occurs in the Prionotropis fauna on 
Athabaska river. 
Horizon and Locality. Very rare in landslide talus from Dunvegan 
sandstone on the north bank of Peace river, about 6 miles west of the 
mouth of rivi&re au BrftlA 
Type. Victoria Memorial Museum; holotype, Cat. No. 6106. 
Inoceramus albertensis n. sp. 
Plate XX, figures 3, 4 
Only left valve known. Large, moderately convex, elongate-quadrate. 
Anterior and basal margins gently rounded; posterior margin subtruncate; 
hinge-line long, but shorter than total length of shell. Beaks incurved, 
situated near anterior end. Surface covered with concentric undulations, 
stronger ventrally. Shell comparatively thin. 
Length 65 mm., height 145 mm., thickness of left valve 55 mm. 
Horizon and Locality. In upper part Kaskapau member of Smoky 
River formation about 40 to 50 feet below Bad Heart sandstone from 
east bank Smoky river, about 1$ miles below Puskwaskau river. 
Type. Victoria Memorial Museum; holotype, Cat. No. 6107. 
Inoceramus corpulentus n. sp. 
( Corpulentus , corpulent) 
Plate XXI, figures 5-7 
For an Inoceramus , somewhat less than moderate size. About 
equivalve. Slightly oblique. Much higher than long. Very convex. 
Somewhat flattened in postero-dorsal angle. Surface deflected inwardly 
anterior to umbo, forming a wide, almost flattened area at right angles 
to plane of valves. Beaks well defined, little produced, curved inward 
and forward a little. Surface covered with irregular, not very well defined 
concentric corrugations. 
Length of holotype 30 mm., height 52 mm., thickness of one valve 
about 24 mm. 
Inoceramus lamarcki var. apicalis Woods 3 from the Middle Chalk of 
England is smaller, not quite so convex, the concentric corrugations where 
present are finer and more regular, the relative height is not so great, 
and the flattening in the postero-dorsal angle is greater. The two are 
very closely related, however. 
i See Woods, Henry, “Cretaceous Lamellibranchia,” 2, Pal. Soo., 1911, p, 278, PI. 
* Woods, Henry, “Cretaceous LameJlibranobia,” 2, Pal. Soo., 1911, p. 281, Pi. 4i 
Stanton, T. W„ U.8. Geol. Surv., Bull. 100, 1893, p. 77, PI. 10, fig. 4, PI. 14, fig. a. 
* Woods, Henry, "CretaceouB Lamellibranchia,” 2, Pal. Soc., 1911, p. 319, PI. 53, figs. 4-6. 
48, figs. 4, 5, PI. 49, fig. 1. 
), fig. 37. 
