244 
TKirriAur verteeeata of tjie fayDm. 
cutti ng-c(lgcs (IS ill /jcuciloclon, but tli6 two posterior premolcirs uikI tlie first iiioliir 
of tlic iii)])er jaw liavc a postero-interual buttress, eiminel-covered, and evidently the 
reiiiiiaiit of a ])ostero-interual cusp : in the premolars at least this buttress is supported 
by a large distinct third root. 
Te.\t-fig. 80. 
Re.stored figures of skull and mandible of Prozeuglodon atro.v : A, from right side ; 15, from above. 
(il., alisphenoid ; ao.f., antorbital foramen; c., canine; cond., occipital condyles; /»•., frontal; f. 1-8, 
incisors ; ju., jugal ; la., lachrymal ; m. 1-3, molars ; mx., maxilla ; na., nasals ; »»»■., external nares ; 
ojit., optic foramen ; 2>a., parietal ; j^gl., postglenoid process ; l- fj premolars ; jnn.v., prcmaxilla ; 
p.orb., postorbital jrrocess of frontal ; soc., supraoccipital ; .s(y., s(]uamosal ; zigj-, zygomatic process of 
squamosal, j nat. size. 
The genus is at present known only from one species, remains of which were found 
in abundance by Mr. Bcadnell * in a valley about 12 kilometres W.8.W. of Gar-el- 
Gehaunem, iu beds of the Birket-el-Qurun series, a, horizon beneath that in which 
* ‘ The Topography and Geology of the Fay urn Froviuce of Egypt' (Survey Department, Cairo, lt)05), p. *17. 
