174 Notices of Memoirs—E. T. Newton—Elgin Reptiles. 
appearance this skull resembles those of Dicynodon and Oudenodon. 
The nasal openings are double and directed laterally ; the orbits are 
large and look somewhat forwards and upwards. The supra-tem- 
poral fossa is large, and bounded above by the prominent parieto- 
squamosal crest, and below by the wide supra-temporal bar, which 
extends downwards posteriorly to form the long pedicle for the 
articulation of the lower jaw. There is no lower temporal bar. 
The maxilla is directed downwards and forwards to end in a small 
tusk. Seen from above, the skull is narrow in the inter-orbital 
and nasal regions, but wide posteriorly across the temporal bars, 
although the brain-case itself is very narrow. There is a large 
pineal fossa in the middle of a spindle-shaped area, which area is 
formed by a pair of parietals posteriorly and a single intercalary 
bone anteriorly. 
The palate is continuous with the base of the skull; the ptery- 
goids on each side send off a distinct process to the quadrate region. 
Towards the front the median part of the united pterygoids arches 
upwards, and the outer sides descend, forming a deep groove; from 
the evidence of other specimens it is clear that the palatines, extend- 
ing inwards, converted this groove into a tube, and thus formed 
the posterior nares. The ramus of the lower jaw is deep, with a 
large lateral vacuity, and the two rami are completely united at the 
symphysis. The back of this skull is not seen, but two other 
specimens, referable to this same genus, show that the occiput had 
two post-temporal fossz on each side. 
This specimen is distinguished from Dicynodon by the presence of. 
two post-temporal fossee on each side of the occiput, by the small 
size of the maxillary tusk ; and probably by the elongated spindle- 
shaped area enclosing the pineal fossa, and also by the slight 
ossification of the vertebral centra. 
A second and much smaller specimen, provisionally referred to 
G. Traquairi, has. besides the skull, a fore-limb well preserved. 
The humerus of this shows the usual Anomodont expansion of its 
extremities; its large deltoid crest is angular, and set obliquely to 
the distal end. : 
Three other species are referred to the same genus, namely :— _ 
Gordonia Husxleyana, which is distinguished from G. Traquairi 
by its proportionately wider and more depressed skull, and by the 
absence of the concavity between the orbits which is present in the 
latter species. The humerus has the distal extremity oblique to the 
deltoid crest, which was probably rounded and not angular. 
G. Duffiana has the skull even wider than in G. Hualeyana, and 
the portion of a humerus found with this skeleton has the two 
extremities set nearly at right angles to each other. 
G. Juddiana has an elongated skull resembling that of G. Tra- 
quairi, but the parietal crests are less developed, the bones of the 
nasal region are much thickened and overlap the nasal apertures, the 
small tusk is placed a little further back and points more directly 
downwards, and the pineal fossa is smaller than in either of the 
other species. 
