75 
a. Occipital bone with long deflected styliform paroccipital processes 
in front of the occipital condyles, and emitting transverse internal 
ridges in which are the condyloid foramina. Squamosals with 
their articular processes projecting directly outwards from their 
bases (and thus aloof from the auditory bullae), and with the 
zygomatic processes overlying the malar bones. Pterygoid bones 
twisted and reflected outwards: the crest continued upwards and 
backwards into the temporal region. Articular surface for lower 
jaw transversely concave, antero-posteriorly convex, and with no 
post-glenoid process. Lower jaw with triangular condyles. Canine 
teeth of upper jaw (in males) more or less twisted outwards and 
upwards and parallel with the lower. Back with no dorsal scent 
gland. (Setifera suiformia.) 
i. Skull with the palato-maxillary axis extremely deflected and 
forming a high angle with the occipito-sphenoidal axis. Basi- 
sphenoid reflected (with a crest uniting with the presphenoid), 
and forming two deep pocket-like cavities. Orbits directed up- 
wards and backwards. Malar bones very deep, and with a short 
inferior process. Dental series aberrant (molars reduced (in old) 
to true (M 1—3) or even last true molar): last or third true molar 
elongated and composed of three longitudinal rows of columnar 
tubercles presenting, when worn, simple oval insular areas. (in- 
cisors, in adults, reduced to 2 (or none) in upper, and sometimes 
none in lower jaw-) 
PHACOCHOERIDAE. 
Skull with the palato-maxillary axis little deflected, and nearly 
parallel with the occipito-sphenoidal axis. Basisphenoid normal, 
=e 
ii. 
and with no bursiform cavities. Orbits directed outwards and 
forwards. Malar bones elongated and with a long inferior pro- 
cess. Dental series normal (M 3x2, PM 4x%2,C1X2,1 8% 2==44): 
molars with corrugated cusps presenting, when worn, deeply 
sinuated insular areas. 
SUIDAE. 
b. Occipital bone with short backward-directed paroccipital processes 
originating sideways from the occipital condyles, and emitting a 
transverse internal ridge continuous with the anterior margin of the 
bone, behind which are the condyloid foramina, Squamosals with 
their articular processes deflected from their bases and bounding 
the outside of the auditory bullae, and with the zygomatic processes 
articulating obliquely with the malar bones. Pterygoid bones 
simply curved outwards: the crest with a crest-like anterior 
process of the squamosal in front of the auditory bullae. Glenoid 
fossa curved and transversely concave, antero-posteriorly concave 
and with a distinct post-glenoid process. Lower jaw with trans- 
verse condyles. Canine teeth of upper jaw simply decurved, very 
acute and trenchant behind. Back with a posterior dorsal scent 
gland. (Setifera dicotyliformia.) 
One family. DICITYLIDAE. 
6 
(XLITI.) 
(XLIIL.) 
(XLIV.) 
