20 REVISION OF THE PELYCOSAURIA. 



of lateral aud inferior edges, and the narrow reflected portion of the anterior border 

 for the capitular facet. The diapophyses are short, and the tubercular faces are not 

 much extended. The zygapophysial surfaces are but moderately oblique. The sides 

 of the centrum are gently and uniformly concave, and the inferior middle line is 

 obtuse and not prominent. The centra of the smaller specimens alluded to are a little 

 depressed and may pertain to another part of the column." 



Measiiremetits. 



m. "2. 



( Antero-posterior 0.021 Expanse of anterior zygapophyses o.oig 



Diameters of centrum -(Transverse 022 Width of neural canal 009 



(^Vertical 021 



In 1880 Cope added to this description an account of the skull : 



"This species is about the size of one of the larger Varanida;^ and about equal 

 to the Clepsydrops jiatalis. It is characterized by a long aud acuminate head, with a 

 large lateral nostril on each side, well forwards, and approaching near the border of 

 the diastema. In the specimen the top of the head is crushed and the postorbital 

 portion is wanting. Anterior to the large lateral tooth there are nine teeth ; posterior 

 to it there are eighteen. The anterior cutting edge of the crown does not extend so 

 near the base as the posterior, and is best marked on the anterior teeth. In the crowns 

 preserved the edges are not serrate." 



Measureynents. 



m. m. 



Length of alveolar edge of mandible 0.120 Length of centrum of axis 0.018 



from diastema to canine tooth 030 of centra of following five vertebrcE--. .071 



of centrum of atlas 010 of ilium at acetabulum 040 



"The lanciform shape of the skull with its consequent peculiarities distinguishes 

 this species from Clepsydrops iiatalis^ and Dimetrodon incisivits. The canine tooth is 

 more posterior, the teeth more numerous, and the alveolar borders less curved than 

 in either of those species. The diastema is less excavated, and the muzzle less obtuse." 



As mentioned in the original description, the species was described 

 from several sets of isolated vertebrse of different sizes ; of these only the 

 vertebrse with skull, No. 1148 Am. Mus., are now certainly determinable. 

 As there is only a single species in the genus its characters are sufficiently 

 given in the description of the genus above. 



Genus VARANOSAURUS Brolli. 



Paleontographica, Bd. Li, 1904, p. 71. 



Type : Varanosauriis aaitirostris Broili. 



The description of the genus is embodied in that of the single species 



below. 



Varanosaurus acutirostris Brolli. 



Paleontographica, Bd. li, 1904, p. 71. 



Type : A nearly perfect skeleton. The girdles and limbs not perfect. Preserved 

 in the Munich Museum. From Texas. 



