TESTFDO EPHIPPIUM. 
83 
fig. A, a). 4, There is no hollow in front of the occipital condyle, the space between 
the condyle and basisphenoid simply shelving downwards towards the latter (b). 5. On 
the front margin of the temporal fossa, in front of the foramen carotidis externce^ there 
is a large not very prominent tuberosity (c) for the insertion of a portion of the 
temporal muscle ; no groove separates this tuberosity from the zygomatic arch ; or, in 
other words, the tympanic cavity is not constricted in front. 6. Tympanic cavity very 
large : the outer tympanic rim ovate, resembling the outline of the human concha, with 
the convex side in front and the pointed part above ; the notch for the passage of the 
Eustachian tube is very broad, but shallow [e). 7. The ridge which runs from this 
notch to the stapedial foramen, and to which the columella is attached, is rather low 
and obtuse. 8-10. The points noticed under these figures in the description of the 
skull of T. elephantopiis (see page 65) are exactly the same in the present species. 11. 
The palatal region is very shallow and broad, in consequence of the outer pterygoid- 
edge being flattened down and expanded in its whole length (Plate XLIV. fig. C, /'). 
The triangular space, of which the foramina palatina and the anterior extremity of the 
vomer form the points, is isosceles in shape, in accordance Avith the generally short 
longitudinal axis of the skull. 12. Anterior surface of the tympanic pedicle with a 
shallow impression. ] 3. Lower jaw with a double alveolar ridge ; its symphysial por- 
tion simply vertical, without a backward expansion of the lower margin of the bone. 
The parts of the angular and coronoid which face each other leave a rather wide cleft 
between them. Upper margin of the angular not excised. 
Limh-hones. — The following bones have been preserved in the large stuffed example, 
and were extracted from it : — The humerus (Plate LI. figs. B, B'), distinguished by its 
great length and slenderness ; its shaft is trihedral in the middle, and not much bent. 
The two hollows which we noticed in T. elephaiitopiis below the head and above the 
trochlea are here absent. The ulnar tuberosity {a) projects high above the head, which 
is nearly entirely raised above the level of the summit of the radial tuberosity. The 
canal [b) for the blood-vessels on the radial edge, close to the elbow-joint, is deep and 
partly open, cutting off", as it were, a splint from the radial extremity of the bone. 
T. elephantopus, T. ephippium, 
790 millims. long. 840 millims. long. 
miUim. millim. 
Length of the humerus (measured in a straight line from the 
summit of the head to the middle of trochlea) 216 235 
Circumference of the narrowest part of the shaft 89 91 
Longest diameter of the head 40 40 
Shortest diameter of the head 37 35 
Extreme breadth between the condyles 82 82 
The bones of the forearm (Plate LIV. fig. B) are, like the humerus, comparatively 
slender ; they are remarkably smooth, without prominent ridges or tuberosities. The 
M 2 
