The carpus consists of a proximal row of three distinct bones and a distal row of smaller and less fully ossified elements. Of the proximal row the _radiale_ (_r′_) is much the largest bone. It is hourglass shaped, with the proximal end somewhat larger than the distal. Proximally it articulates mainly with the radius but also slightly with the ulna and ulnare. Distally it articulates with the centrale. The _ulnare_ (_u′_), the second bone in size in the wrist, has about the same shape as the radiale but is much smaller. Proximally it articulates with the pisiform, radiale, and, apparently, with the ulna; distally it is in contact with the fused carpalia elements. The _pisiform_ (_p_) is a small, irregular bone, articulating with the ulna and the ulnare; it is apparently connected by a long ligament with the fifth metacarpal but does not actually articulate with it. The _centrale_ (_ce_) is a flattened, partially ossified element between the radiale and the first and second metacarpals. The distal carpal bones are represented by two irregular, partially ossified elements between the ulnare and the third, fourth, and fifth metacarpals. The manus proper consists of five digits. The _metacarpals_ (_m_) are of about the same shape, but vary in length and thickness; each consists of a cylindrical shaft with a slight enlargement at each end. The first digit or pollex has two phalanges, the second has three, the third has four, the fourth has four, and the fifth has three. The terminal phalanx of each of the first four digits is pointed, has a pair of lateral grooves, and is encased in a large, horny _claw_ (_cl_). _The Pelvic Girdle_ and _Posterior Limb_. The pelvic girdle is described differently by Wiedersheim and Reynolds; the bone called by the former the pubis, the latter calls the epipubis. The bone called by Wiedersheim the pubis takes no part in the formation of the acetabulum; the pubis of Reynolds helps form the acetabulum but is a very small, unossified structure. Gadow also calls the lower bone the epipubis. I shall follow Reynolds’s interpretation. The _ilium_ (Fig. 28, 1) is a heavy bone with a dorso-laterally projecting crest; medially it is firmly united to the sacral ribs (Fig. 18, 5) while its outer side forms the upper and greater part of the acetabulum. Its outer and lower border has two surfaces, the larger and more posterior articulating with the ischium, the other with the cartilaginous pubis. [Illustration: FIG. 28. PELVIS AND SACRUM OF AN ALLIGATOR (_Caiman latirostris_). ×¹⁄₂. (Brit. Mus.) (After Reynolds.) 1. ilium. 2. ischium. 3. true pubis. 4. epipubis (so-called pubis). 5. acetabular foramen. 6. neural spines of sacral vertebrae. 7. symphysis ischii. 8. process bearing prezygapophysis.]