DESCRIPTION OF PLATES. 91 



2 - in. Width of ditto, T2 in. Length of symphysis, 3'5 in. Between external al- 

 veolar margins of canines, 27 in. Length of three last premolars and three true 

 molars, 5'oin. Length of true molar series, 3'1 in. Between first and second pre- 

 molars, -6 in. Between first premolar and canine, -5 in. From anterior margin of 

 canine alveolus to mesial line, 1*5 in. Width between rami posteriorly, l - 5 in. 



Plate LXXI. 



Fig. 1. — Sus (Hippolvjus) Sivalensis. Left half of palate, natural 

 size, showing three molars, three posterior premolars, and the alveoli of 

 the first premolar, canine, and three incisors. The third or hindmost 

 molar is not at all ground. — -B.M. 



Extreme length of palate, 63 in. Length of first molar, "6 in. ; of second, - 95in. ; 

 of third, rioin. Width of first molar, -6 in. ; of second, - 8in. ; of third, "Sin. 

 Length of third premolar, "5 in. ; of fourth, - 5 in. "Width of third premolar, "4 in. ; 

 of fourth, -5 in. ; between canine and first premolar, - 6in. 



Fig. 2. — Sus {Hippohyus) Sivalensis. Second and third molars, 

 imperfect. — B.M. 



Length of fragment of second molar, "55 in. ; of third, l - 45 in. Greatest width of 

 third posteriorly, -J3 in. 



Fig. 3. — Sus {Hippohyus) Sivalensis. First and second true molar 

 and portion of fourth premolar. — B.M. 



Length of first true molar, o in. ; of second ditto, 1 • in. "Width of first true molar, 

 •45 in. ; of second, - 63 in. 



Fig. 4. — Sus {Hippohyus) Sivalensis. Fourth premolar and first and 

 second true molars. — B.M. 

 Length of first molar, - 55 in. ; of second, - 85 in. 



Fig. 5. — Sus Hysudricus. Three true molars and third and fourth 

 premolars, upper jaw, left. — B.M. 



Length cf third premolar, o in. ; of fourth ditto, "5 in. ; of first molar, - 6 in. ; of 

 second, - 8 in. ; of third, l'l in. Width of third premolar, "35 in. ; of fourth, - 53 in. ; 

 of first molar, - oo in. ; of second, - 66in. ; of third, - 7in. 



Fig. 6. — Sus Hysudricus. Three molars and three posterior pre- 

 molars, lower jaw, left. The last molar is imperfect. — B.M. 



Length of second premolar (at alveolar ridge), "45 in. ; of third, - 45 in. ; of fourth, 

 o in. ; of first molar, "55 in. ; of second, # 7 in. "Width of fourth premolar, '35 in. ; 

 of first molar, - 43 in. ; of second, '53 in. 



Fig. 7. — Sus Hysudricus. Second and third true molars, upper jaw, 

 right. — B.M. 



Length of second molar, -65 in. ; of third, - 8o in. "Width of second molar, - 7 in. 

 Extreme width of third molar anteriorly, - 7 in. 



Fig. 8. — Sus Hysudricus. Second and third true molars, well worn. 

 -B.M. 



Length of second molar, - 73in. ; of third, 1-4 in. Width of second, -6 in. ; of 

 third anteriorly, '65 in. 



Fig. 9. — Sus Hysudricus. Canine, four premolars, and first and 

 second molar, upper jaw, right. — B.M. 



Length of first premolar, or retained milk molar, '4 in. ; of second, '5 in. ; of 

 third, -5 in. ; of fourth, -45 in. ; of first molar, '6 in. ; of second, -65 in. 



