BROILIELLUS, A NEW GENUS OF AMPHIBIANS 51 



name A. novomexicanus Williston. It is also like that of Cacops 

 except that it is not closed behind. The tabulare is a little elongate 

 posteriorly, but is not turned downward to meet the quadrate, as in 

 Cacops and Dissorophus. 



The surface of the skull is everywhere deeply marked with 

 small, oval, or rounded pits. The most striking characteristic of the 

 species, however, is the presence of numerous tubercular tuberosi- 

 ties, which must have given the animal when alive a peculiar aspect. 

 Each element of the upper surface of the skull has at least one such 



Fig. 2. — BroiUellus texensis. Skull, from below, three-fourths natural size. No. 

 684, University of Chicago. 



spiny tubercle, and on each frontal there are at least two. The 

 most prominent ones, however, almost approaching the character 

 of short spines, are situated on the immediate margins of the 

 orbits, one on each prefrontal, frontal, postfrontal, postorbital, and 

 a smaller one below on each jugal. 



The sutures throughout are easily distinguishable with the aid 

 of a hand lens as slender, impressed, sinuous, or zig-zag lines. 

 They have been corroborated throughout, not only on the two 

 sides of each skull, but on the two skulls as well, though there is 



