. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Thecodontosaurus and Palseosaurus. 149 centrum to the summit of the neural spine is X-^ts inch. It is interesting as preserving the chevron-bone in natural articu- lation and for showing that the posterior facet for this bone is twice as wide as the anterior facet. The proportions of the centrum are Crocodilian rather than Saurischian. The caudal vertebra in slab 63 Brist. Mus. is liij- inch long. The articular faces of the centrum are about y^^ inch deep anteriorly and poster
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Thecodontosaurus and Palseosaurus. 149 centrum to the summit of the neural spine is X-^ts inch. It is interesting as preserving the chevron-bone in natural articu- lation and for showing that the posterior facet for this bone is twice as wide as the anterior facet. The proportions of the centrum are Crocodilian rather than Saurischian. The caudal vertebra in slab 63 Brist. Mus. is liij- inch long. The articular faces of the centrum are about y^^ inch deep anteriorly and posteriorly. The vertebra is posterior in position to no. 17, for the transverse process has become reduced to a tubercle. The height to the summit of the neural spine is lyV inch. (See fig. 3, c.) No. 19 Brist. Mus. includes three small caudal vertebrge in which the neural spine is lost. The centrums are each about y'u inch long. The postzygapophyses are received between the prezygapophyses, indicating a vertical movement. The contour between the zygapophyses longitudinally is Ilium of Palajosaurus. (Figs. 2 and 3.) The iliac bones already referred to which occur in the slab no. 63 are associated with a caudal vertebra, double-headed ribs, proximal end of a tibia, a fragment of fibula, and other remains. The anterior angle of the ilium is small and appears to be imperfect, and the posterior angle is worn. The gently convex superior crest is 3^ inches long as preserved. Its middle part approximates towards the sacrum, owing to the Fig-. 2. Posterior Ischiac process. External aspect of left ilium of Paleeosaurus. Brist. Mus. no. 63. ^ nat. size. outward reflexion of the anterior angle, which makes the superior contour of the crest of the bone concave in length. The posterior angle of the crest is much more prolonged than the anterior angle, so that one half of the bone is behind the posterior border of the acetabulum. The superior and inferior edges of this process converge, b
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