106 FAUNA ANTIQUA SIVALENSIS. 



of ditto, l - 23 in. Length of third premolar, l - 23 in. Breadth of ditto, T3 in. 

 Length of second premolar, l - 33in. Breadth of ditto, 1*3 in. Length of first 

 premolar, l"7in. Breadth of ditto, 1*2 in. 



Fig. 2. — Lower jaw, right side, with entire molar series. 



Length of third molar, T26 in. Breadth of ditto, '6 in. Length of second 

 molar, l - 2 in. Breadth of ditto, '7 in. Length of first molar, 1*2 in. Breadth of 

 ditto, "8 in. Length of third premolar, l - 3in. Breadth of ditto, - 8in. Length 

 of second premolar, 1"26 in. Breadth of ditto, "83 in. Length of first premolar, 

 l'45in. Breadth of ditto, "73 in. Length of molar series, 7'65 in. Length of 

 three true molars, 3 - 55 in. 



Fig. 3. — Equus Sivalensis. Fragment of upper jaw, right side, with 

 three true molars and two posterior premolars. — B.M. 



Length of third molar, l - 25 in. Breadth of ditto, l - 05in. Length of second 

 molar, l - in. Breadth of ditto, 1*15 in. Length of first molar, -9 in. Breadth 

 of ditto, ri3in. Length of third premolar, 1*15 in. Breadth of ditto, 1-2 in. 

 Length of second premolar, l - 2in. Breadth of ditto, l - 2 in. Length of molar 

 series (first premolar wanting), 5"45 in. Length of three true molars, 3 - 15 in. 



Fig. 4. — JEqiius Sivalensis. Fragment of lower jaw, including right 

 horizontal ramus, with three anterior molars, milk dentition, and sym- 

 physis with outer incisor and alveoli of middle and inner incisors on 

 either side. 



Length of fragment, 9*3 in. Length of milk molar series, 4 - 15 in. Interval 

 between first milk molar and external incisive alveolus, 3*75 in. Between central 

 points of inner alveolar border of external incisors, l'3in. Length of third 

 milk molar, 1*45 in. Breadth of ditto, "56 in. Length of second milk molar, 

 1-25 in. Breadth of ditto, - 6 in. Length of first milk molar, l'5in. Breadth of 

 ditto, "63 in. Length of crown of external incisor, "53 in. Breadth of crown of 

 ditto, "35 in. Length of alveolus of middle incisor, -55 in. Length ditto of internal 

 ditto, "55 in. Between posterior angles of last milk molars, 2 - 16 in. Between 

 anterior angles of anterior milk molars, 1-2 in. 



Figs. 5 and 5 a. — Equus Sivalensis. Fragment, comprising anterior 

 part of upper and lower jaws in almost natural apposition. Shows six 

 incisors and two small canines in both jaws ; also the two front pre- 

 molars on one side of lower jaw. — B.M. 



Between posterior angles of external incisors of lower figure in 5 a, 1-9 in. 

 Length of crown of three incisors of one side, 1 - 2 in. Between anterior edge of 

 mental foramen and anterior edge of canine, 2 - 4 in. Between anterior edge of 

 mental for. and posterior edge'of ext. incisors, 2 - 9 in. Diastema between canine and 

 exterior incisor, - 4 in. Diastema between canine and anterior edge of first pre- 

 molar, 3-3 in. Length of anterior premolar, 1*35 in. Breadth of ditto, -6 in. 

 Leugth of external incisor, -5 in. Length of middle ditto, -45 in. Length of 

 internal ditto, - 35 in. Between posterior angles of exterior incisors of upper 

 jaw in fig. 5 a, 2 - 2 in. Length of three incisors of one side, 1*8 in. Diastema be- 

 tween anterior premolar and canine, 3-2 in. Height of first premolar, 3 - in. 

 Length of external incisor, S in. Length of middle ditto, "8 in. Length of in- 

 ternal ditto, - 7o in. 



Figs. G, 6 a, and 6 b. — Equus Sivalensis. Fragment comprising an- 

 terior portion of palate, with six upper incisors and two rudimentary 

 canines. — B.M. 



Between posterior angles of external incisor alveoli, 2-45 in. Between external 

 alveolar margins of canines, 2*1 in. Between canine and external incisor, -4 in. 

 Breadth (extreme) of incisor series, 2-8 in. Breadth of three incisors (oblique), 

 1-75 in. Length of crown of external incisor, 7 in. Breadth of ditto, -45 in. 

 Length of crown of middle incisor, -65 in. Breadth of ditto, -46 in. Length of 

 crown of internal incisor, - 56 in. Breadth of ditto, 5 in. 



