Section IV., 1907. [219] Trans. R. §. C. 
XVI.—On a new Crocodilian Genus and Species from the Judith River 
formation of Alberta. 
By Lawrence M. Lamps, F.G.8., Vertebrate Palæontologist to 
the Geological Survey of Canada.+ 
(Read May 15, 1907.) 
The crocodilian remains, from the Judith River formation of Al- 
berta, that form the subject of the present paper, were obtained by the 
writer in the years 1897, 1898 and 1901 in an area of “bad lands” on 
Red Deer river below the mouth of Berry creek and have been already 
mentioned in “Contributions to Canadian Paleontology,” vol. III 
(quarto), pt. II, 1902, descriptive of some of the vertebrates that com- 
pose the interesting Cretaceous fauna characteristic of the Judith River 
(Belly river) formation as developed in Alberta and Montana. 
It is probable that the crocodilian remains from the area near 
Berry creek, found separately but in the same beds, belong to a single, 
species and, after further study of the specimens, the writer believes 
that the species represented is referable to a hitherto undescribed genus. 
The material from Red Deer river includes a left mandibular ramus, 
the posterior part of a cranium, portions of the skull, teeth, and a 
number of vertebre and scutes. Of these specimens the ramus of 
the lower jaw is selected as the type of the species; the other specimens, 
of which the back portion of the cranium may be regarded as the cotype, 
‘are associated with the type. 
In the Geological Survey memoir above mentioned, p. 17, the cro- 
codilian teeth from Red Deer river were referred provisionally to Croco- 
dilus humilis, Leidy, and the lower jaw and occiput to Bottosaurus per- 
rugosus, Cope. C. humilis was founded on teeth only from the Judith 
River beds of Montana. B. perrugosus is from the Laramie of Eastern 
Colorado and was characterized from vertebræ, parts of the skull and 
fragments. The teeth occurring with the Red Deer River specimens 
are very similar to those described by Leidy from Montana and although 
they were in the first instance referred to Leidy’s species it is now 
thought inadvisable to make such a reference as our knowledge of C. 
humilis is confined to teeth that do not afford definite specific characters. 
Also further study of the other Red Deer river remains has convinced 

2 Communicated by permission of the Director of the Geological Survey of 
Canada. 
2 New genera and species from the Belly River series, by Lawrence M. Lambe. 
