3:ii5 
A MKMOIK L'l’OX THE GENUS 
V nrosCMit as in the skull of F. paludosus. The 
,!n3”r'.iijbtly -c.|.ar„U.d, .u,d tl.e mastoid probably did not np^ar 
malar i..sc.r.ioa of Z laHcfs cloady re^mble. 
.1... 7nimalo,l,.rium. It ariaoa abruptly fmm the cheek, its antenor exttom.ty 
an«I fn.in this |K,rlion a prominent lateral keel arises from the suiface of 
the l*.ne, separating tl.e flattened superior surface from the infermr. 1 osterior to 
tl,e orbital pna-esses, the malar is round in section and differs m form from that of 
P paludosus, in which the pisterior part of the malar is strongly compressed into a 
hnmd Intend ph.U-. The mlation of the malar insertion to the infraorbital foramen 
larger species of Falc^osyops. In L. laticeps 
I plaU*. 
is diflenmt fniin that of the , 
this foramen is <-onsi.lerahlv anU-rior to the origin of the malar, and is there- 
r«n- exiKweil. 'riie anterior lx.rder of the malar is above the anterior limit of the 
first molar and it is thus considerably more prolonged forward than in P. pahidosus. 
'rhe .limeiisions of the palate are nearly the same as in the other allied sjiecies, 
although its nsif is num* excavated than in the latter. The inferior termination of 
the palate is op|s>site the |M>sterior Isirder of the second molar. 
Foramina. — 'I'lie comlyloi.l foramen is very small in L. laticeps and is 
phietsi neaivr the condyle than in P. paludosus. The foramen lacerum posterius is 
sepiirateil from tin* foramen lacerum medium by the prolongation of the periotic 
ncriws the lateral vacuity. 'I'lie foramen ovale is small, and. nearer the ffiramen 
Inei'nini meiliniii than in P. paludosus. The posterior opening of the alisphenoid 
cnnal is unusual ly hirgi*. and is jdiu'cd rather more forward than in the skull of P. 
mrparhiuus. The ptervg«»id plate of the sphenoid, forming the external walls of the 
nlisplieiioiil canal is flat and much elongated from before backward. The extent of 
the nlis|ilicnoid canal has alivady lx*en referred to in describing the skull of /I 
meparlunus ainl it seems to Ik* a eluiracter of this group of Perissodactyles. The 
anterior niiiunoii o|M‘ning of the alisphenoid canal and the sphenoidal fissure is very 
largi*. 1 his canal is not divided by a hoi'izontal .sejitum sepaiating the alisphenoid 
cnnal pn»|M*r fnnn the common canal for the sphenoidal fissure and foramen rotun- 
«lutn IIS in the skull of the Taj.ir. At the suijei'ior inner border of the anterior 
..|K*ni..gof the alisphenoid canal is situated another foramen, which may lx* the 
optic; if s... It has an extremely posterior position ; it is widely separated from 
the ahsphenoid canal, as m the skulls of the Tapir and Rhinoceros. In Eguus, 
.... .l„.,., ,,.rba,.,l.tb- ,.|,lic !ai,lacri.j„at above the funimon rotu.idum 
and on a line with the mferior limit of the alisphenoid canal 
f''We.r.-./<y.-The encephalic cavity of the skull of Z. laticeps is much 
r . T i" of its brain cavity indicates tlm 
Tp iVrW T o»e-ln iV that 
JbiZ: .;ftbec..„,.ia, cavity i, ,,.0 
- i. .-«-b.u:.i .ihi, ; atiiirr “ 
more 
at the 
