292 PROFESSOR OWEN ON SOME SPECIES OF THE EXTINCT GENUS NESODON. 
glenoid cavity is 1 inch 4 lines. It is slightly concave from side to slightly 
convex from behind forwards, where it forms the ‘emmenoa articularis (fig. , 
which is about 3 lines in antero-posterior extent at Us middle, widening o mce 
that dimension at the outer and the inner ends of the eminence. The narrowe. 
concavity behind this part is bounded behind by the thick process (pg), extending a 
little below the level of the outer end of the emmentia articularis, convex antenor v 
and below, concave behind, into which deep concavity a venous canal or sinus appears 
“xhrsXTaf surface on the inner side of the squamosal (fig. 3, ,i), for junction with 
the alisphenoid and tympanic, extends from the eminentia articularis g) ^ 
end of the post-glenoid process (pg), behind which the broken surface of the ha 
part of the squamosal shows part of a smooth cavity. 
^ The zygoma (fig. 1, =«, =i) is deep and strong, bent from behind forwards in a gentle 
sigmoid curve, first convex upwards, then more deeply concave to form the lower 
part of the orbit, very slightly arched outwards, and formed by the squamosa W 
Ld malar («) in almost equal shares, the major part of 
describing a strong curve, convex forwards. The zygoma is ^ 
extremities, and of least vertical extent near its anterior one, wheie it foims 
orbit (fig 1 o). There is no trace of post-orbital process from either the malar oi 
squamosal parts <>f ‘he zygoma, nor of any sutural surface for a “qirthe’ 
ortital process, as in the Horse. The orbit communicates as “tensively with 
temporal fossa as in the Tapir and Rhinoceros. The maxillary bone (fig. 1, .0 send 
backwards a plate along the inner side of the fore-part of the zygoma, w 
by a squamous suture with the malar; the malar terminates forwards giadualy 
contracting as it ascends, at about the middle of the anterior boundary of the mbit 
whence it extends but a very short way upon the face. The articular surface to 
the lacrymal bone may be seen upon the conjoined orbital portions of nmla. 
and maxillary, but the lacrymal itself is lost: its extent upon ‘he face must h 
been as trifling as that in the Hyrax. The facial part of the maxillary s lofty 
not Ion-, gradually decreasing in depth to its anterior border, which is nea > 
vertical, measuring 1 inch 4 lines in that extent, and wholly united to P-e- 
maxillary. The outer facial surface of the snbquadrate facial plate of ‘he ‘ - 
is concave and perforated by the antorbital canal (s), which opens 6 hues n 
advance oS the orbital border of the maxillary, and 13 lines from the suture wit . 
the premaxillary. There is a second small foramen m advance of the large ant- 
orbital one. The palatal plate (fig. 3, ..) of the maxillary extends backward 
beyond the alveolus of the last molar tooth in place, where its breadth 
lat at the fore-part of the plate, viz. 5 lines: the plate is 10 lines broad at the 
middle of its extent, where it forms the anterior end of the oblique ‘““S ' 
(ib. ») for the palatine. The palatines are lost in the specimen ; they appea 
formed the middle two-fourths of the produced back part of the bony pala e. 
