4 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



having a siipratemporal fenestra with a high posterior border, are 

 relatively primitive and could not possibly be of Upper Triassic 

 age; also Acompsoscmrus and Desmatosuchus, which have still more 

 primitive characters, could hardly be expected in Upper Triassic 

 beds. Metoposaurus^ AnasoMsjna:^, and Buettneria must be Middle 

 Triassic forms. They are closely related and Metoposaurus does not 

 occur in Europe later than lower Keuper. Some plants and some 

 fishes of these beds are related to tliose of the Atlantic coast. 



FOSSILS FROM THE TRIASSIC OF CENTRAL AND WESTERN REGIONS 



A. Fossils of probable Middle Triassic age : 



Wyoming. — Near Lander (Willow Creek) and Wind River in the Pope 

 Agie beds of the Chugwater formation — 

 Palaeorhinus 'bransoni Williston. 

 Angistorhinns grandis Mehl. 

 Angistorhinus gracilis Mehl. 

 Dolichoirachium gracile Williston. 

 Eubrachiosaurus browni Williston. 

 BrachyhracMum hrevipes Williston.. 

 Anaschisma hrowni Branson 

 Anaschisma hrachygnathum Branson 

 Colorado. — Purgatoire River, in first exposure south of Bent Canyon, near 

 Las Animas : Fragments of a lai-ge Parasuchian skull. 



Eighteen miles east of Canyon City : Parasuchian fragments. 

 San Miguel River in sandy conglomeratic rock : Parasuchian tooth. 

 Silver Creek, north of Rico Mountains, at entrance of small gulch at 

 3,260 meters' elevation : Fragment of Parasuchian jaw with alveoli. 

 Utah. — Clay Hill near San Juan Riv^er : Heterodontosuchus ganei Lucas. 

 Canyon of Grand River near Moab, above Ferry, 30 miles below base 

 of Vermillian ClifiC sandstone in a conglomerate which lies uncon- 

 f ormably above the underlying beds : Fragmentary bone. 

 Arizona. — Near Tanners Crossing and Holbrook, Little Colorado River — 

 A)igistorhinus, species? 

 MaGhaeroprosopus validus Mehl. 

 Machaeroprosopus, species. 

 Heterodontosuchus ganei Lucas. 

 Placerias hesternus Lucas. 

 Metoposaurus fraasi Lucas. 

 Adamana : Parasuchian teeth and bones, among them being Palaeoc- 



tonus orthodon Cope and P. dumbliantis Cope. 

 Near Fort Wingate and Petrified Forest : 

 Palaeorhinus (afE.) bransoni Williston. 

 Acompsosaurus wingatensis Mehl. 

 New Mexico. — Arroyo Seco, west of Abiquiu : Machaeroprosopus buceros 

 Cope. 

 Mesa Poleo, 40 kilometers southwest of Albiquiu : Fragments of Para- 



suchians and Stegocephalians. 

 Laguna : Fragments of Parasuchians and Stegocephalians. 

 ^anta Rosa : Fragments of Parasuchians and Stegocephalians. 

 Twenty kilometers northwest of Cobra Springs : Fragments of Para- 

 suchians. 

 Forty-five kilometers south of Tucumcari : Parasuchian bones. 

 West of San Juan: Parasuchian bones. 



