. Water reptiles of the past and present . Fig. 4 Fig. s Fig. 4.—Seymouria, a primitive cotylosaurian. Skull, from above: pm, pre-maxilla; n, nasal; /, lacrimal; p, prefrontal; /, frontal; pf, postfrontal; it, inter-temporal; st, supratemporal; sq, squamosal; ds, dermosupraoccipital; t, tabulare;j, jugal; po, postorbital; m, maxilla; s, surangular; ang, angular; pa, parietal. Fig. 5.—-Seymouria, skull from the side. Explanations as in fig. 4. As in other parts of the skeleton, there has been a reductionin the number of parts of the reptile skull from that of the moreprimitive forms, and a bett
. Water reptiles of the past and present . Fig. 4 Fig. s Fig. 4.—Seymouria, a primitive cotylosaurian. Skull, from above: pm, pre-maxilla; n, nasal; /, lacrimal; p, prefrontal; /, frontal; pf, postfrontal; it, inter-temporal; st, supratemporal; sq, squamosal; ds, dermosupraoccipital; t, tabulare;j, jugal; po, postorbital; m, maxilla; s, surangular; ang, angular; pa, parietal. Fig. 5.—-Seymouria, skull from the side. Explanations as in fig. 4. As in other parts of the skeleton, there has been a reductionin the number of parts of the reptile skull from that of the moreprimitive forms, and a better adaptation of those which remainfor the special uses they subserve. This reduction in number hasbeen caused in part by the actual loss of bones, in part by the fusionof contiguous ones. The most primitive reptiles had no less thanseventy-two separate bones in the skull;1 the human skull has 1 Paired maxillae, premaxillae, nasals, prefrontals, lacrimals, frontals, parietals,dermosupraoccipitals, tabularia, supratemporals, intertempo
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