22 ROYAL SOCIETY OF CANADA 



The Teleost Rhineastes eruciferus is known only from fragments of 

 cranial bones. Diphyodus longirostris, whose relationships are uncer- 

 tain, is of interest; it is hoped that additional material ma}' soon throw 

 light on its affinities. 



The batrachian species, ScapJierpeton tectum, is the only fossil 

 representative of the subclass that we have. Cope was of the opinion 

 that the genus was most probably referable to the Urodela. 



In this series of rocks the remains of the Eeptilia present a variety 

 of forms of land and fresh-water groups of unusual interest. The 

 plesiosaur Cimoliasaurus magnus, a marine type, is known originally 

 from the Cretaceous of New Jersey. There are in all seven genera of 

 turtles. The Pleurodira (fresh-water tortoises) are Compsemys ? 

 victus, Ba'éna hatclieri and B. antiqua. Cretaceous representatives of 

 the Jurassic family of Pleurosternidse, a decidedly archaic feature of 

 Ihis fauna. The Cryptodires are of the two families of Adocidœ and 

 Chelydridœ Of the Adocidse (swamp turtles) are Adocus lineolatus, 

 known from fragments of the shell having a very distinctive sculpture, 

 and Basilemys variolosus (Cope's Compsemys variolosus) a turtle of 

 large size with a roughly sculptured sihell, of which the plastron is 

 massive and reaches a length of nearly three feet. The Chelydroid 

 species, Neuranlcylvs eximius is peculiar in having a ninth costal bone 

 to the carapace. The river turtles, Trionychia, are represented by one 

 species of the family of Plastomenidee, Plastomenus costatus, and two 

 of the Trionychidae, viz. : Tnonyx foveatus and T. vagans, with a third 

 not as yet determined. T. foveatus and T. vagans, previous to the expe- 

 ditions to the Red Deer river were known only from shell fragments, 

 but the material now in our possession has afforded us data for the 

 reconstruction of almost the entire shell in each case. A well-preserved 

 carapace (lacking only the nuchal plate) and the larger bones of two 

 or three plastra, of T. foveatus are included in the collections from 

 Alberta. As regards T. vagans, a complete carapace was obtained in 

 the same region, and as there is little doubt that the species Plastomenus 

 coalescens. Cope, from the Belly Eiver series in Assiniboia, is based on 

 the greater part of the hyoplastral and hypoplastral bones of T. vagans, 

 the plastron of this species also is fairly well known. 



Vertebrae referable to Cope's species Champsosaurus annectens, and 

 described by the writer in 1902, are from the Belly Eiver series of 

 Alberta. In his memoir on " The Eeptilian subclasses Diapsida and 

 Synapsida and the early history of the Diaptosanria,"^ Professor Osbom 



* Memoirs of the American Museum of Natural History, Vol. I,, 1903; and 

 " Reclassification of the Reptilia," American Naturalist, vol. xxxviii., p. 93, 

 ï'ebruary, 1904. 



