304 The American Naturalist. 



[A K i 



This order embraces, at present, four families, comprising 24 species 

 distributed among 12 genera, as follows : Elginiidae, 1 genus, 1 species ; 

 Pariasaurida?, 3 genera, 7 species; Diadectida?, 5 genera, 9 species; 

 Pari, ti hi.be 6 genera (of which 3 are new, viz. : Isodectes, Captor- 

 hinus and Hypopnous), and 12 species, of which 5 are new. Total, 29 

 species, 15 genera.— E. D. Cope. 



Explanation of Plate Vila. 



Pariotichus aguti Cope. From the Proceeding Amer. Philos. Society, 

 November, 1895. Fig. 1, Skull, from side. Fig. 2, Skull, with angu- 

 lar parts of mandible adherent, cervical vertebrae and scapular arch, 

 from below. Fig. 3, Skull, from above, with cervical vertebrae. Fig'. 

 4, Anterior two-thirds of mandibular arch, with adherent premaxillarv 

 bones, from above. Fig. 5, Humerus. N., Nasal bone ; R, Frontal"; 

 Pff., Prefrontal ; Pof., Postfrontal ; P., Parietal ; Pmx., Premaxillary '; 

 Mx., Maxillary; J., Jugal ; Qj., Quadratojugal ; St., Supratemporal \ 

 Sm., Supramastoid ; Tab., Tabulare ; So., Supraoccipital ; V., Vomer; 

 Pa., Palatine; Par., Paroccipital ; Ecp., Ectopterygoid ; Ps., Ptery- 

 goid ; Q., Quadrate ; Ce. Clavicle ; Ep., Episternum ; H., Humerus. 



The Puget Group.— Sir Wm. Dawson confirms the opinion 

 advanced by Dr. G. M. Dawson in 1890 that the formation in the 

 north-western part of the United States to which the name Puget group 

 has been given, extends into British Columbia as far as Burrard's Inlet. 

 This great estuarine deposit extends southward as far as the Columbia 

 River and from the coast line to the Cascade range, within which its 

 beds rise to a height estimated at from 800 to 5000 feet above the level 

 of the sea. They overlie the Cretaceous Chico series in the United 

 States, and its equivalent the Nanairao formation in Canada. The 

 latest views of paleobotanists and geologists of the United States seem 

 to be that these beds are of Eocene age and that the fossil plants may 

 be best compared with those of the Upper Laramie of the interior 

 plains. In so far as Canada is concerned it has been established that 

 the Upper Laramie beds underlie a formation containing animal fossils 

 of the White River Miocene period, so there can be no doubt as to their 

 Eocene age, and consequently of the Eocene age of the Puget group in 

 Canada. 



A further confirmation as to this view of the age of the formation 

 in question is found in a collection of fossil plants from the vicinity of 

 Burrard Inlet. These were referred to Sir Wm. Dawson for identifica- 

 tion who sums up the results of his study as follows: 



