Archive image from page 102 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 PELONEUSTES EVANSI. to the inner side of the teeth in use seems to show that the normal tooth-replacement was in operation. The atlas and axis of this specimen, allowing for crushing and fracture, are similar to the atlas and axis of the type specimen described and figured by Seeley in Quart. Journ. Geol. Soc. vol. xxxiii. (1877) p. 716, figs. 1 & 2. T
Archive image from page 102 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 PELONEUSTES EVANSI. to the inner side of the teeth in use seems to show that the normal tooth-replacement was in operation. The atlas and axis of this specimen, allowing for crushing and fracture, are similar to the atlas and axis of the type specimen described and figured by Seeley in Quart. Journ. Geol. Soc. vol. xxxiii. (1877) p. 716, figs. 1 & 2. The centra of the other cervicals are also like that of the fourth cervical figured by Seeley. As in Peloneustes philarchits, the length of the centrum in the mid-ventral line is greater than that of the dorsal side. The neural arches are high; the zygapophyses are strongly developed, the articular surface of the anterior zygapophysis in most of the cervicals being gently convex, the surface of the post-zygapophysis being correspondingly concave. The neural spines seem to have increased in height from before backwards; they differ Text-fig. 28. Teeth of Peloneustes evansi. (E. 389 L, ?s nat. size.) , surface of wear. widely in form from those of Peloneustes philarckus in that, instead of being com- pressed from side to side, they are flattened from before backwards, particularly at their upper ends, towards which they widen out ; the anterior face bears a number of rough ridges, running from the base of the spine to the summit. This flattening may have been produced in part by post-mortem pressure, but since it occurs on the neural spines of all the cervicals, it was no doubt present in the living animal and indicates that the movements of the neck were in some way different from those habitual to Peloneustes philarchus; the cervical ribs are similar to those of that species. The dorsal centra are much crushed, but were perhaps rather shorter PART II. L
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