77 
Inoceramus lundbreckemis n, sp. 
Plate XV, figure 4; Plate XVI, figure 2 
A large, oblique, moderately convex species, much higher than long. 
The maximum convexity is on the postumbonal slope, above which is a 
broad depression radiating from the umbones, and above this again, along 
the postero-dorsal submargin a narrow ridge, a small part of which is 
preserved in the holotype. The posterior ear is flattened and only a small 
part of it is preserved. The body of the shell is ornamented with wide, 
distant concentric ribs of strong relief which are thickest where they cross 
the postumbonal slope and take on a lip-like form there. Between these 
are three to five even, regular, and much smaller concentric ribs. These 
are all crossed by small, weak, radiating ribs which appear to be most 
pronounced on the umbonal slope. The posterior wing has growth lines 
only. The stronger concentric ribs at their termination on the ridge along 
the postero-dorsal margin carry large, irregular nodes. This shell must 
have grown to a large size; for the paratype specimen, which is the middle 
part of a right valve, was at least a foot high. 
Inoceramus cardissoides Goldfuss 1 has much stronger radiating ribs. 
Horizon and Locality . Near the top of the Colorado shale, on the 
north bank of Crowsnest river, west of Lundbreck and in the SW. \ sec. 
27, tp. 7, range 2, W. 5th mer. 
Types, National Museum of Canada; holotype, Cat. No. 9037; 
paratype, Cat. No. 9037a. 
Scaphites ventricosus var. saxitonianus n. var. 
(Saxitonia, the Rocky Mountain country) 
Plate XVIII, figures 1-3; Plate XIX, figures 1, 2 
The specimens referred to this species are very variable, but all have 
thick compressed whorls, the venter little arched or almost flattened, the 
living chamber not long and much as in Scaphites ventricosus Meek and 
Hayden, the whorl markedly tapered at the aperture, and the ribs coarse 
and distant, without well-defined nodes. S, ventricosus has a more rounded 
venter and finer and more ribs. Scaphites vermiformis 2 Meek and Hayden 
is smaller, has relatively thinner whorls, somewhat finer ribbing, and well- 
defined nodes. Measurements of holotype near middle of living chamber. 
Diameter 59 mm. 
Height of whorl 53 per cent 
Thickness of whorl 72*4 per cent 
Width, umbilicus 14 per cent 
The maximum diameter, parallel to extended part of living chamber, 
is 70 mm. 
Horizon and Locality. In the Colorado shale of Crowsnest river west 
of the Blairmore sheet, from about 840 to about 1,500 feet above base of 
section there exposed. 
Types. National Museum of Canada; holotype, Cat. No. 9041; 
paratype, Cat. No. 9041a. 
1 See Mem. Brit. Cret. Lamell., Pal, Soc., 2, pt. 8, 1912, p. 300, text figs. 57-58. 
s See Stanton, T. W.: U.S. Geol. Surv., Bull. 106, p. 183, PI. 44, fig. 3. 
77865— 6i 
