1895.] 45o ^Cope. 



The parasplienoid bone widens anteriorly so that the pterygoid foramina 

 are triangular with the base posterior and the apex anterior. At the 

 extremities of the transverse processes of the parasphenoid the pterygoids 

 send a prominent border downwards ; they then curve rather abruptly 

 outwards to the quadrates. The teeth have not been fully exposed, but 

 on the middle of the length of the maxillary bones they are small and 

 widely spaced. 



Dimensions. 



No. 1. MM. 



Total length on middle line 100 



Width at orbits 84 



No. 2. 



Width at orbits 96 



" between extremities of quadrates 130 



" " tabular horns 21 



" " orbits 27 



Length from orbit to extremity of tabulare 40 



It is uncertain whether there is a process at the inner side of the tabulare 

 as in Z. serratus. The region of the occipital condyle is without projec- 

 tion and is like that of other species of the genus. 



Zatrachys conchigerus, sp. nov. 



This ganocephalous batrachian is known to me from the posterior part 

 of the cranium of an individual of about the size of the smaller specimen 

 of the species just described. It differs from tiiis and from the Z. serratus 

 in two conspicuous characters. First, the tabular processes are .smaller 

 and more widely separated from each other ; second, the border of the 

 quadratojugal element projects freely from the distal part of the quadrate, 

 and is separated from it by an open emargination. The orbits are not so 

 small as in Z. microphthalmus, have a raised border, and are posteriorly 

 placed. Their diameter is about equal to the space between their posterior 

 border and the tabuloquadrate notch, and is about half the interorbital 

 width. The tabular processes are quite small, and the border connecting 

 them is depressed in the center. The surface is strongly rugose. 



The occipital condyles are represented by two shallow cotyli, which are 

 confluent on the middle line. The posterior part of the pterygoid forms a 

 sharp curve inwards before reaching the quad^-ate, and presents a thin 

 edge inferiorly. The free edge of the quadratojugal is serrate. The muz- 

 zle of this specimen is broken off a short distance anterior to the orbits. 



Dimensions. mm. 



Width at quadrates 56 



" quadratojugals 74 



" between orbits 20 



" " tabular processes 25 



Diameter of orbit 10 



