Contributions to Canadian Palaeontology, 87 



Megalosauria, Iguanodontia and Ceratopsia ; and there are 

 many more of these species in the Montana than in the Lara- 

 mie series. His conclusion is that the Belly River formation 

 is older than the Laramie, not only because the fauna which 

 it embodies is more ancient in character; but also because the 

 animals belonging to both series seem to have reached a high- 

 er development in the Laramie than in the Belly series. 



Mr. Lambe's contributions to the present publication gives 

 detailed information regarding the fossils of the Belly River 

 series. The species collected belong, for the most part, to 

 the class Reptilia. They occur abundantly and in an excel- 

 lent state of preservation. Five species of Pisces are shown 

 first, two of them being new: Acipenser Albertensis, and Diphy- 

 odus longirostris, belonging to a new Genus, Diphyodus. The 

 Bateachia are represented by but one species, Scapherpeton 

 tectum. The Plesiosaubidae are also represented by only a 

 single species, Cimoliasaurus Magnus. The Chelonia family 

 show Trionyx foveatus, T. vagans, Adocns lineolatus, A. vario- 

 lo'sus, Neurankylus eximhis, — a new Genus ana species. The 

 Rhynchocephalia family is represented by Ghampsosmirus 

 iinncctens, Troodon formosus, Crocodilus linmilis, and Botto- 

 saio-us perrugosus. There are two species of Deinodon, Dei- 

 vodon liorridus and D. explanatus, belonging to the Dinosatt- 

 ria. A new species of Ornithomimus is reported, 0. ciltus. 

 Three species of the Stegosauridae are given, Palaeoscincus 

 costeitus, P. as per, and among them StereocepJialus tutus, a new 

 species of a new Genus. The family Ceratopsidae is one of 

 the most important of those included in the Belly River 

 rocks. Three of the species reported by Mr. Lambe are new, 

 MonocJoniits Daicsoni, in honour of the late Dr. G. M. Dawson, 

 Director of the Geological Survey, M. Canadensis, M. Belli, 

 in honour of the present acting Director, Dr. Robert Bell, 

 Stegoceras validus. 



Three new species of Teachodoxtidae are described, 

 Traclwdon (Pteropelyx) Selicyni, named after a former Director 

 of the Geological Survey of Canada. — T. marginatiis, and T. 

 altidens. 



Mr. Lambe's paper concludes with a description of two new 

 species of fossil mammals, Ptilodus primaerus and Boreodon 

 matntinus, belonging to the family of Plagiatjeacidae. The 

 determination of these species rests upon the fossil remains 

 of teeth, — in the former case, the first molar and the fourth 

 premolar are preserved ; in the latter case, the type is repre- 

 sented by a single tooth, a premolar, having two slightly 

 divergent roots. 



