82 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
Immediately succeeding, and in contact with this tooth, is the third premolar or sectorial 
tooth. The transverse section of this tooth would he a narrow isosceles triangle, the apex pos¬ 
terior, and the base slightly notched or emarginated for the reception of the preceding tooth. 
Viewed laterally, the lower or cutting edge of this tooth is divided into three angular lobes by 
two angular notches. The middle lobe is longest and descends deepest, its straight edges nearly 
at right angles ; the lobe is directed a little backwards. The anterior lobe is small, and occupies 
about one-fourth the length of the tooth. The posterior lobe is about as long as the middle one, 
its lower edge extending to the posterior edge of the tooth and forming an obtuse angle with the 
posterior edge of the middle lobe. There is a rounded excavation at the base of the notch sep¬ 
arating these last two lobes, on the outer surface of the tooth. The inner anterior angle of the 
triangular crown is constituted by a tubercle, from which passes a sharp ridge to the tip of the 
central lobe. The single true molar is very small, its crown transverse, with a central tubercle, 
and so placed within the tooth in front of it as to be visible only in part from outside. 
The lower incisors are smaller than the upper, and exhibit a gradual increase in size to the 
outer one. They are wedge-shaped, and there is.a low tubercle on the outer edge of the trench¬ 
ant crown separated by a notch. The lower canines are like the upper ones, only more curved, 
the anterior outline being more convex and the posterior more concave. The anterior sharp 
ridge is seen to be more in the middle of the inner face of the tooth. The first and second 
premolars are somewhat similar ; the latter longest and highest; each shows a trenchant com¬ 
pressed cutting edge, with a central angular lobe (its transverse section triangular) with a 
smaller one at the base on each side. There is also a slightly raised rim to the posterior ex¬ 
tremities of these teeth bounding the small basal lobe. In some cases a slight notch divides 
the anterior basal lobe of the second premolar into two. The posterior or true molar is entirely 
trenchant, without any internal lobe. It is divided by an obtuse angled rectilinear notch into 
two lobes, the anterior smallest, with a closed slit dipping down vertically from the bottom of 
the notch, inside of which the tooth is considerably excavated. 
The lower incisors are immediately^succeeded by the canines. There is a considerable interval 
between the canines, however, and the first premolar, fully equal to the length of the latter 
tooth. 
The deciduous dentition of the panther is, incisors, canines, ; molars, |E§— 26. In 
one specimen (No. 1110) the permanent first and second incisors of both jaws have supplanted 
the others ; the new canines have not yet pierced the gum ; the first upper permanent premolar 
has taken its place; the other premolars not visible; the true molars above and below are visible 
in the cleaned and dried skull, but had not pierced the gum. There is an obsolete groove down 
the outside of the fang and collar of the upper canine, but none on the crown. The first molar 
has already been replaced by its successor ; the second is like the third permanent premolar, and 
is the sectorial tooth. The central lobe is, however, more acute and nearly in the middle of the 
tooth, occupying about the central third. The inner tubercle and fang are also immediately 
above this central lobe, and thus opposite the middle of the tooth. The anterior lobe is also 
divided into two by a notch. The third molar is small, the crown transverse and emarginate 
externally; the two roots in a transverse line; the section of the crown is an elongated triangle, 
the apex pointing inwards. 
The lower deciduous canine is more compressed laterally than its successor, and has a small 
tubercle on the anterior portion of its inner face. The first and second molars resemble, respect¬ 
ively, the second and third permanent molars more than they do their immediate successors 
