REPTILIA : LIMNOSCELIS 



29 



riorly to join the anterior end of the basisphenoid, very much 

 as in Trinacromerum among the plesiosaurs. In the specimen the 

 front part lies obliquely in the matrix an inch or more in width, 

 with the lower margin, that visible in its normal position, narrow. 

 Behind the rounded median convexity of the sphenoid, the bone 



Fig. 4. — Limnoscelis paludis. Skull, from below, two-fifths natural size, sp, 

 splenial; pa, prearticular; st, stapes ( ?). 



is broadly concave in the middle, on either side of which the usual 

 basisphenoid process is directed downward, backward, and outward, 

 to end in a rather stout projection. In the middle of this concavity 

 the sutural line for union with the basioccipital is evident. The 

 occipital condyle is quite flat or even concave, as in Diadectes and 



