Page:Popular Science Monthly Volume 24.djvu/370

356 are spacious, and chambered in their anterior region; the orbits are of moderate size and elongated along the vertical. The temporal fossa is limited above and below by a bony arch, a disposition which is otherwise found among living lizards only in the Hatteria. The



Head: a, left nostril; b, left orbit; c, left temporal fossa. Vertebral column: d, cervical region; e, dorso-lumbar region; f, sacral region: g, caudal region; h, left scapula; i, left coracoid; k, left humerus; l, left ulna; m, left radius; n, sternum; o, left ilium; p, left pubis; q, left post-pubis; r, left ischium; s, left femur; t, left tibia; u, left fibula; v, third trochanter. I, II, III, IV, V, digits; X, diagrammatic transverse section of the body between the fore and hind limbs.