75 



a. Occipital bone with long deflected styliform paroccipital processes 

 in front of the occipital coiiJyles, and emitting transverse internal 

 ridges in which are the coudyloid 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 coudyles. 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-spheuoidal 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. (XLII.) 



ii. Skull with the palato-maxillary axis little deflected, and nearly 

 parallel with the occipito-sphenoidal axis. Basisphenoid normal, 

 and with no bursiform cavities. Orbits directed outwards and 

 forwards. Malar bones elongated and with a long inferior pro- 

 cess. Dental series normal (M fx2, PM |x2,C }x2, 1 * x2=44): 

 molars with corrugated cusps presenting, when worn, deeply 



siuuated insular areas. 



STTIDAE. (XLIH.) 



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-gleuoid 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. DICOTYLIDAE. (XLIV.) 



