106 FAUNA ANTIQUA SIVALENSIS. 
of ditto, 1°23 in. Length of third premolar, 1-23in. Breadth of ditto, 1-3 in. 
Length of second premolar, 1°33in. Breadth of ditto, 13in. Length of first 
premolar, 1‘7in. Breadth of ditto, 1:2 in. 
Fig. 2.—Lower jaw, right side, with entire molar series. 
Length of third molar, 1:26in. Breadth of ditto, 6 in. Length of second 
molar, 1°2in. Breadth of ditto, *7in. Length of first molar, 1:°2in. Breadth of 
ditto, ‘Sin. Length of third premolar, 1:3in. Breadth of ditto, -8in. Length 
of second premolar, 1°26in. Breadth of ditto, *83in. Length of first premolar, 
1-45in. Breadth of ditto, °73in. Length of molar series, 7°65in. 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, 1:25in. Breadth of ditto, 1:05in. Length of second 
molar, l‘in. Breadth of ditto, 1:15in. Length of first molar, -‘9in. Breadth 
of ditto, 1:13in. Length of third premolar, 1:15in. Breadth of ditto, 1:2 in. 
Length of second premolar, 1:2in. Breadth of ditto, 1:2 in. Length of molar 
series (first premolar wanting), 5-45 in. Length of three true molars,.3°16 in. 
Fig. 4.—Equus 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°3in. Length of milk molar series, 4:15in. Interval 
between first milk molar and external incisive alveolus, 3°75in. Between central 
points of inner alveolar border of external incisors, 13in. Length of third 
milk molar, 1°45in. Breadth of ditto, :56in. Length of second milk molar, 
1:25in. Breadth of ditto, -6in. Length of first milk molar, 1-5in. Breadth of 
ditto, °63in. Length of crown of external incisor, °53in. Breadth of crown of 
ditto, *35in. Length of alveolus of middle incisor, 55 in. Length ditto of internal 
ditto, °55in. 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, 1-9in. 
Length of crown of three incisors of one side, 1-2in. Between anterior edge of 
mental foramen and anterior edge of canine, 2-4in. Between anterior edge of 
mental for. and posterior edge’of ext. incisors, 2°9in. Diastema between canine and 
exterior incisor, ‘4in. Diastema between canine and anterior edge of first pre- 
molar, 3°3in. Length of anterior premolar, 1:°35in. Breadth of ditto, ‘6 in. 
Length of external incisor, ‘5 in. Length of middle ditto, -45in. Length of 
internal ditto, *35 in. Between posterior angles of exterior incisors of upper 
jaw in fig. 5a, 2°2 in. Length of three incisors of one side, 1°8in. Diastema be- 
tween anterior premolar and canine, 3-2 in. Height of first premolar, 3° in. 
Length of external incisor, ‘8 in. Length of middle ditto, Sin. Length of in- 
ternal ditto, °75 in. 
Figs. 6, 6 a, and 6 6.— 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°-45in. Between external 
alveolar margins of canines, 2*lin. Between canine and external incisor, ‘4 in. 
Breadth (extreme) of incisor series, 2°8in. Breadth of three incisors (oblique), 
1:75in. Length of crown of external incisor, -7in. Breadth of ditto, -45in. 
Length of crown of middle incisor, °65in. Breadth of ditto, -46in. Length of 
erown of internal incisor, ‘56in. Breadth of ditto, ‘5 in. 
