DR. GUNTHER ON THE ANATOMY OE HATTERIA. 
615 
Bones of the Hind Limb. 
The pelvis (figs. 27 & 28) represents the Lacertian, and not the Crocodilian type, and 
differs from the former in the subvertical direction of the ascending part of the ilium, 
the axis of which forms with that of the vertebral column an angle of about 80°. Its lower 
surface is flatter and less convex than in the majority of Lizards. The ascending part of 
the ilium is about thrice as high as broad, and projects much beyond the transverse pro- 
cesses of the sacrum ; its hinder margin is nearly straight, the anterior having two very 
slight tuberosities — the upper opposite the junction with the sacrum, and the lower on 
the ilio-pubic suture. The acetabulum is formed by the three pelvic bones, as in Lizards. 
The pubic and ischium are very similar in form, and form with their fellows moderately 
broad symphyses ; the obturator vacuity is of the usual extent, divided into two by a 
strip of the symphysial cartilage. The pubic has a remarkably developed uncinate 
process ( c ) in the middle of its anterior margin ; and still more prominent is the tube- 
rositas ischii (d), the distance of the latter from the uncinate pubic process of the 
same side being quite equal to that between the two pubic processes. These processes 
serve for the attachment of ligaments and muscles, to be described subsequently. The 
pubic bone is perforated by a nerve and blood-vessels for the abductor muscles of the 
femur, about midway between the uncinate process and the foramen obturatorium. The 
symphysial cartilage shows scarcely a trace of ossification. 
The bones of the upper and lower leg do not differ from the Lacertian type : there is 
one large trochanter (corresponding in position to the trochanter minor), no ossification 
in the ligamentum patellare, no sesamoid bone between femur and fibula, as in Varanus. 
The tarsal and metatarsal bones agree with those of Varanus in number and arrange- 
ment ; all are thin and flattened. The first series is composed of the two bones which 
may be briefly designated as astragalus and calcaneum\ the suture between them is 
scarcely visible, but it may be distinctly seen that the fibula is articulated with the cal- 
caneum alone, without coming in contact with the astragalus. The second series consists 
also of two bones (the inner being very small), intercalated between the first series and 
the three middle metatarsals. The fifth metatarsal has the proximal end dilated, this 
dilatation having the irregular form of a tarsal. A thick cartilage, without ossification, 
intervenes between the first metatarsal and astragalus. The first metatarsal is shorter, 
the three middle longer, than, and the fifth as long as the two proximal phalanges 
together. The number of phalanges is 2, 3, 4, 5, 4. 
Muscles of the Hind Limb. 
The determination of the homologies of several of these muscles (fig. 34) is a matter of 
uncertainty ; I am guided in it chiefly by the proximal point of their insertion, in the 
second place by their function, considering their development and extent a matter of but 
little importance. The powerful extensor known as MM. rectus and vasti, and properly 
regarded as one muscle by Hyrtl ( extensor cruris quadriceps), is at once recognized ; it 
