PAL^OSYOPS LEIDY, AND ITS AI.I.IES. 
liV> 
lateral expansion of the surface of the lanibdoidal crest extends alsait two-thinis 
across the surface of the occiput, and then becomes shaq) and eniitinuous with the 
paroccipital region. The constricted portion of the occiput above the huaiinen mag- 
num is very small in this skull, and diverges behind to form a prominent notch over 
the foramen. Laterally the paroccipital processes are vide and provided witli the 
usual styliform processes. The transverse extent of the condyles is much less in 
this species than in P. paludostis. The superior and inferior notches aiv also less, 
and there is no prolongation of the condylar surface on the basicK-cipital. '1 he 
transverse groove upon the surface of the basioccipital Ixdween tlie condyles 
and paroccipital process is much less marked than in P. tncgarhinus. I he 
posterior pjrolongation of the base of the occiput beyond the ])ar«K'cipital region 
is much reduced in this skull, and consecpiently the position of the condyles 
is like that of the Tapir’s skull; more underneath and ])rojecting very little 
behind. The basioccipital is broad and shoid ; its anterior median keel is strongly 
developed, and the anterior prominences of this poidion of the skull are large ami 
well constricted off from the surface of the bone. The lateral surface of the hasi- 
occipital is thinner and more deeply excavated than in P. paludosus. The lateral 
vacuities of the basal region of the skull are bi-oad and short and their anterior 
openings are separated from the posterior by the advancement of the periotic acros.s 
this cavity'. The basispheiioid is short, and its transverse extent In'twinm the l)od\- 
and the glenoid facets is considerable. The lamina suri-ounding the foramen ovale 
is small and has a much less antero-posterior extent than in the skull ol P. 
hinus. The antero-posterior and transverse e.xtent ol‘ the alis|)lK‘n«)ids is much 
greater than in the Tapir, and this applies as Avell to other menilH*r.s <>f this gnuip. 
The extent of the alisphenoid is shown in the anterior jirolongation of the ant«*rior 
opening of the alisphenoid canal, and its extent superiorly. 
Squamosal . — The squamosal forms the largest part of the convex surface of 
the temporal fossa, as above the squamoso-parietal suture this fossa l>eeomes deeply' 
excavated and forms the base of the perpendicular portion. At the mitldle of its 
superior portion the squamosal has two well marked foramina which are appai-eiitly^ 
absent in the skulls of other species of this subfamily. The /.ygoinatie iKirtion of 
the squamosal is very broad, heavy, and widely separatcl fmm the surface of the 
skull, thus forming a marked character. With the huge crest ali-eady descrilK'd the 
skull’ of this species presents a grotesque appearance. In L. laticcps the ha.-*al 
portion of the squamosal differs in extent and position from that <d'/'. paludosus ; in 
the latter the glenoid portion is straight and more widely siqiarateil fn>m the skull 
than in L. laticcps. The glenoid facet is at right angle.s to the axis of the .skull, 
whereas in L. laticcps it is obli.pre in position. The audit<.ry pnK-i-s.sr's cloudy 
resemble those of P. paludosus in form; the iiostglenoid is shorter, hn.mler and its 
axis is parallel with that of the glenoid facet. An internal glem.id luia-ess is pmsm.t 
in L laticcps. The posUvmp‘i«ics are heavier, stouter and nioiv divergent than in 
P. paludosus. At their Imsal portion and at their junction with the ,.ar.KTipitals. 
47 JOUR. A. N. S. PHILA., VOL. XI. 
