Geological Society of London. 191 



part of the canine by continu >rs growth. The author infers that the 

 animal was monophyoclont. JElurosaurus was said to be most nearly 

 allied to Lycosaurus, but its in -isor formula is Dasyurine. 



With regard to the characters of the Theriodontia the author re- 

 marked that we may now add to those given in his ' Catalogue of 

 South African Fossil Eeptiles,' that the humerus is perforated by an 

 entepicondylar foramen and the dentition is monophyodont. 



3. "Additional Observations on the Superficial Geology of British 

 Columbia and its Adjacent Eegions." By G. M. Dawson, Esq., D.Sc, 

 F.G.S. 



This paper is in continuation of two already published in the 

 Society's Journal (vol. xxxi. p. 603, and vol. xxxv. p. 89). In sub- 

 sequent examinations of the southern part of the interior of British 

 Columbia the author has been able to find traces of giaciation in a 

 N. to S. direction as far as or even beyond the 49th parallel. Iron 

 Mountain, for instance, 3500 feet above the neighbouring valleys, 

 6280 feet above the sea, has its summit strongly ice- worn in direction 

 N. 29° W.-S. 29° E. Other remarkable instances are given which 

 can hardly be explained by local glaciers ; boulder-clay is spread 

 over the entire district ; terraces are cut in the rearranged material 

 of this, bordering the river- valleys, and at greater elevations expand- 

 ing over the higher parts of the plateau and mountains. At Mount 

 It-ga-chuz they are 5270 feet above the sea. The author considers 

 that the higher terraces can only be explained by a general flooding 

 of the district. Some of the wide trough-like valleys of the plateau 

 contain a silty material which the author regards as a glacial mud. 



North of the 54th parallel and Avest of the Kocky Mountains 

 similar evidence of giaciation is obtained ; erratics are found in the 

 Peace and Athabasca basins. The fjords of British Columbia are 

 extremely glaciated, the marls being generally in conformity with 

 the local features ; terraces are scarce and at low levels. The Strait 

 of Georgia was filled by a glacier which overrode the S.E. part of 

 Vancouver's Island ; evidence is given to show that this ice came 

 from the neighbouring mountainous country. Queen Charlotte's 

 Island shows evidence of local giaciation. Boulder-clays and stratified 

 drifts are found, with occasional arctic shells. 



The author considers that the most probable explanation of the 

 phenomena of the whole region is to suppose the former existence 

 of a great glacier mass resembling the inland ice of Greenland, and 

 that the Glacial period was closed by a general submergence, during 

 which the drifts were deposited and, at its close, the terraces cut. 



Erratum. — In the March Number, page 138, line 15, of the Geol. 

 Mag., for siromatojporides read stomatoporide^. 



