ANGISTORHINUS, A NEW GENUS OF PHYTOSAURIA 
FROM THE TRIAS OF WYOMING 
MAURICE G. MEHL 
University of Chicago 
During the summer of 1904 a paleontological expedition from 
the University of Chicago, under the direction of Dr. S. W. 
Williston, made some valuable collections of vertebrate fossils from 
the Trias of Wyoming along the Popo Agie River. From these 
collections Dr. Williston described Paleorhinus bransonit and 
mentioned three other phytosaurian skulls,t all of which were 
collected by Drs. E. B. Branson and R. L. Moodie. Dr. Williston 
has very kindly granted the writer the permission to study these 
phytosaurs and it is from this material that the following notes are 
drawn. Considerable time and patience have been required of Mr. 
Paul C. Miller in the preparation of two of these skulls for mounting 
and the work is not yet completed. In all probability it will be 
some time before a full description with figures of these specimens 
is possible and for this reason it seems advisable to give a brief 
diagnosis of a new form represented by them for the benefit of 
others that may be studying this group of reptiles. 
Angistorhinus grandis, GEN. AND Sp. Nov. 
This form is represented by a nearly complete skull and a 
mandible of which the right ramus, back of the symphysis, is 
missing, as is a small part of the left ramus. Many limb bones, 
dorsal plates, and other fragments were found in the same locality 
with the skull and may belong to this species. 
In a lateral view the skull resembles very closely that of Mys- 
triosuchus Fraas.2, The premaxilla, as in Mystriosuchus, are 
“Notice of Some New Reptiles from the Upper Trias of Wyoming,” Jour. Geol., 
XII (1904), 606. 
2 Die Schwabischer Trias-Saurier nach dem Material der Kgl. Naturalien-Sammlung 
in Stuttgart susammengestellt (1896), p. 16, Pl. V. 
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