380 Mr. A. S. Woodward on the 



m. 



Width of occiput 0-20 



Length from occiput to orbital riin 0-13 



Maximum depth of hvomandibular 0-23 



Width of upper end of ditto, about 0-09 



Leng-th of post-temporal 0'16 



Depth of supraclavicle 0'20 



Maximum width of ditto O'Oo 



Cranium. 



The cranium has lost the rostral region, and the floor of 

 the brain-case with the parasplienoid is broken into three 

 pieces separate from the main mass. The hinder portion of 

 the cranial roof is well-preserved and shown of two fifths the 

 natural size in PI. X. fig. 1. The right post-temporal [p.t.) 

 and some of tlie vertebral elements (/?.c., pl.c.^ n.) are crushed 

 upon the occiput, whicii is thus a little obscured ; but the 

 cliaracteristic narrow projecting portion of choiidrocranium 

 beyond the roofing membrane-bones is conspicuous. The 

 parietals {po.) are remarkably tinsymmetrical, that of the 

 right side being twice as broad as that of the left, and the 

 former exhibiting only a small antero-lateral point, while the 

 latter extends far forwards into the frontal by its corresponding 

 process. Except on their overlapped hinder border these 

 bones are entirely covered by a fine rugosity and tubercula- 

 tion, but without any traces of enamel. The relatively large 

 frontals {Jr.) are approximately equal in maximum width, 

 but that of the right side is narrowed behind, and tiieir 

 median suture is extremel}^ wavy, with one large acute loba- 

 tion just behind the interorbital region, and numerous suiall 

 interdigitations in front, where the fossil is fragmentary and 

 then terminates. Posteriorly the ornamentation is a little 

 more sparse than that of the parietals, anteriorly it becomes 

 much coarser, and there is a tendency to radiation towards 

 the margin of the bone. The squamosals (.s*^.) are relatively 

 large and torm a symmetrical pair, each gradually tapering 

 forwards as far as the exposed portion of the postt'rontal 

 (/?/./.), and then rapidly terminating in an anterior acute 

 point. They are ornamented like the frontals, and exhibit 

 a conspicuous narrow smooth area, widest behind and tapering 

 forwards, close to the inner margin of the element. The 

 posttrontal ( ;>^/.) is only exposed for u very small space on 

 each side, and appearances suggest that the cartilaginous 

 element itself is shown without any investing membrane- 

 bone. There are no marks of regularly disposed sensory 

 canals on any part of the roof. 



The chondrocranium itself is imperfectly ossified, but when 



