Lepidotus occidentalis, Leidy, 1860

Lambe L. M., 1902, New genera and species from the Belly River Series (mid-Cretaceous), Geological Survey of Canada Contributions to Canadian Palaeontology 3, pp. 25-81 : 29

Lepidotus occidentalis , Leidy.

Plate XIX, fig. 3 .

Lepidotus occidentalis , Leidy, 1860. Trans. Amer. Philos. Soc. Extinct Vertebraba from the Judith River and Great Lignite formations of Nebraska, pi. 11, figs. 20-23 .

Numerous scales, from the " bad lands " of Eed Deer river, are apparently not distinguishable from those described by Leidy under the name Lepidotus occidentalis .

The scale figured is fairly representative of those in the collections, as regards form and size. The lozenge-shaped, enamelled outer surface is smooth and shiny, with generally a few small, puncture or pit-like depressions scattered toward the centre; a few observed edge. Length of specimen figured 18-5 growth lines are generally parallel to its mm., greatest thickness 3*0 mm.

Belly Eiver series, Eed Deer river, 1898 and 1901.

Similar scales were collected by Dr. Gr. M. Dawson on Belly river, N.W.T. (Nos. 40 and 41), in 1881, and by Mr. T. C. Weston, at Eoss coulee, near Irvine on the line of the C.P.E., in 1884.

Figures

PLATE XIX. Fig. 1. Myledaphus bipartitus, Cope, pavement tooth, face of crown; enlarged four times. Page 28. Fig. 2. Side view of same tooth. g, crown; f, face of crown; r, root. Fig. 3. Lepidotus occidentalis, Leidy, outer surface of scale natural size. Page 29. Fig, 4. Monoclonius dawsoni, Lambe, lcft scapula and coracoid, internal view. (Provisionally associated with M. dawsoni); onefourth natural size. Page 60 Fig. 5. Monoclonius dawsoni, predentary bone, lateral view. (Provisionally associated with M. dawsoni); natural size. Page 63. Fig. 6. The same, viewed from above. s scapula; c coracoid; a, suture between scapula and coracoid; g, glenoid cavity; b, upper,, border d, anterior end; e, groove for dentary.

Fig. 20. -Posterior crest of Monoclonius belli, from Red Deer river; one-ninth natural size. The dotted lines are from a drawing of the head of T. gladius, Marsh, as seen from above. P, Parietal S, Squamosal F, Fontenelle

Fig.21.—A, front view of right femur of Trachodon selwyni, from Red Deer river B, front _ view of right femnr of Iguanodon 1mantelli, from the Wealden of England One-sixteenth naturalsize. h,head t,greattrochanter m, thirdtrochanter; c,innercondyle.

Fig. 22. -Diagrammatic representa- tioii of the growth of teeth in Traclzoclon. A, transverse section of t-he mandibular minus; B, transverse Swim' of the ınzıx« illa. The heavy lines represent the enzunelled surfaces of the erowns of the teeth. c, grinding surfaces d, much worn teeth c, partly worn teeth;f, sneeessional teeth in the same vertical row with d and e: g, for-amen: h, mandibular groove f, inner wall of dental chamber‘.

FIG. 23-Ilia of herbivorous dinos-aurs from Red Deer river one-twelftli the natural size. A, right ilium of Monoclonius dawsoni; B, the same of Trachodon marginatus: C, that of Stereocephalus tutus. A, ztect-abtllum P, facet for pubic bone Is, facet for ischinm.