AETIODACTYLA. 
355 
Length of the first true molar... 0. 008G 
Width of the first true molar.. . ... (». OOG 
Depth of the ramus at the last molar...... 0. 020 
Depth of the ramus at the diastema. 0.0103 
Length of the sternal segment. ’ . 0. 0253 
Width of the same...... .. 0.022 
A second specimen embraces portions of botli horns, tlie last premolar 
and first true molars, part of the mandible containing the last molar, 
fragment of sternum, distal portion of cannon-bone, etc., all indicating a 
rather smaller animal than the last. As in that one, the beams of the horns 
are smooth and without indication of fracture at the base. The principal 
branch is, however, broken off a short distance above its bifurcation, and 
just below the irregularly-rounded extremity is surrounded by a burr-like 
osseous ring of considerable prominence, repeating what has already been 
described in the D. furcatus. The molars of both jaws are without basal 
tubercles between the inner" columns. The external side of each of the 
superior true molars presents a longitudinal rib opposite the anterior ex¬ 
tremity of each crescent. Immediately behind the anterior rib in the last 
premolar and the second true molar is a well-marked groove; otherwise the 
external face js plane. The enamel is obsoletely roughened. In the last 
inferior molar, the dentine of the fifth column is continuous with that of the 
two which precede it. 
Length of the beam of the horn......... 0. 04G 
Diameter at the base.... 0.015 
Length of the superior molars four, five, and six. . .... 0. 025 
Length of the fifth superior molar.... 0. 0085 
Width of the same. ... 0.0090 
Length of the last inferior molar.. 0. 015 
Depth of the ramus at the same... 0. 020 
Transverse diameter of the distal extremity of the cannon-bone. 0. 016 
A third horn is of rather larger size than those above described. 
Length of beam 0“.063; diameter at base 0“.017. A fourth specimen is 
similar to the second in size and form, but has a prominent osseous rim, or 
simple burr, extending round the beam one-third the distance from the base. 
It descends extero-posteriorly, as in the J). furcatus. Length of beam 
0“.058; diameter above base 0™.013. A fifth specimen is similar in char- 
