. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. OPHTHALMOSAUEUS. 47 elongate coracoid, such as occurs in the more primitive members of the group— in Shastasaurus os7nonti, from the Trias of Northern California, the coracoid of which is figured by Merriam *. The present condition of this notch is due to the great expansion of the bone generally, and there seems to be no sufficient evidence for the view that it formed the posterior border of a foramen closed in front by a
. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. OPHTHALMOSAUEUS. 47 elongate coracoid, such as occurs in the more primitive members of the group— in Shastasaurus os7nonti, from the Trias of Northern California, the coracoid of which is figured by Merriam *. The present condition of this notch is due to the great expansion of the bone generally, and there seems to be no sufficient evidence for the view that it formed the posterior border of a foramen closed in front by a precoracoid Text-fig. Left coracoid of Ophthiilmosaurus : A, outer end; B, upper surface ; C, inner (syinphysial) end. (E. 2137, J nat. size.) , anterior notch; , surface for union with opposite coracoid ; , glenoid facet; j).h., posterior border; , facet for scapula. cartilage; certainly, even in the earliest forms there is no ti^ace of any ossified pre- coracoid. No doubt the short anterior prolongation of the coracoid internal to the notch was capped with cartilage, as also was the inner process of the scapula, but there is no evidence that these two cartilages ever joined to enclose a fenestra. The scapula (text-fig. 33) is greatly expanded towards its lower end, which is also greatly thickened posteriorly, while anteriorly it is thinner, and towards its anterior * Bull. Dept. Geol. Univ. California, vol. iii. (1902-4) pi. x. See also coracoid of Shastasatm(s alexaiidrce, figured ojj. cit. pi. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Geology; Andrews, Charles William, 1866-1924. London, Printed by order of the Trustees
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
