Bottosaurus perrugosus, Cope, 1875

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 : 48

Bottosaurus perrugosus Cope.

Bottosaurus perrugosus , Cope. 1875. Report U. S. Geol. Survey Terrs., vol. 11. Vertebrata of Cretaceous Formations of the West, p. 6 S, pl. vl, figs. 5-8.

A left mandibular ramus, from which the posterior ends of the dentary and splenial bones and thc articular and coronoid elements are missing.

The supra-angular shows, on its inner posterior surface, the facet for the articular bone, and also in its lower border the posterior end of the external mandibular foramen. The lower margin ofthe internal mandibular foramen is seen in the anterior half of the angular. The external surface of the dentary shows small, deep pits directed forward and inward, from each of which a shallow groove passes backward for a short distance; the pits are arranged in somewhat obscure longitudinal rows. The lower outer surface of the angular is rugose, from the presence of dcep grooves running in a longitudinal direction. This outer sculpture changes, in the supra-angular, into an irregular and bold network of ridges enclosing deep, sunken areae. Altogether the surface markings are as shown by Cope in his figures. There are sixteen sockets for teeth, the second, third and fourth of which, counting from the front, still rctain a hollow root. The symphysis is Well shown. The front end of the splenial enters into the formation of nearly one-fourth of the symphysis. A foramen passes through the splenial immediately behind the symphyseal surface.

The species is still further represented, in the collections, by the occiput of another individual, obtained in 1901, and requiring further study. Numcrous vertebrae and bony sentes of Crocodilia have also been obtaincd, some of which will probably be found to belong to this species

Measurements.
	M.
Estimated length of ramus.	.355
Width in front.	.031
Height in line with posterior margin of external mandibular " formnen	.053
Width of lower border Where the last measurement was taken.	.016
Height of symphysis.	.018
Length of same. aPPTOx approx-	.047
Width of first two sockets	.011
Length of next three.	.0055
Length of tenth and eleventh sockets.	.008
Length of fifteenth socket	.006
Distance between outer edges of quadrates, posteriorly.	.201
Height of foramen magnum	.014

Belly River series, Red Deer river, 1897, 1898 and 1901.