. The Quarterly journal of the Geological Society of London. superoccipital ( occipital superieur Cuv.) 3; to theseadd the parietals 7, with the lateral extensions 7, the squamosal 27,and the mastoid 8: the proximal part of the tympanic is indicatedat 28. In the Lacertian order I select the skull of the sea-Lizard of theGalapagos Islands (Amblyrhynchus cristatus) for the present aim(fig. 2.) The chief modifications are (the suture between 2 and 4being obliterated):—the greater extension of the transverse abut-ment, 2-4, against the joint contributed by the mastoid, 8, and squa- * Tom. cU. pi.
. The Quarterly journal of the Geological Society of London. superoccipital ( occipital superieur Cuv.) 3; to theseadd the parietals 7, with the lateral extensions 7, the squamosal 27,and the mastoid 8: the proximal part of the tympanic is indicatedat 28. In the Lacertian order I select the skull of the sea-Lizard of theGalapagos Islands (Amblyrhynchus cristatus) for the present aim(fig. 2.) The chief modifications are (the suture between 2 and 4being obliterated):—the greater extension of the transverse abut-ment, 2-4, against the joint contributed by the mastoid, 8, and squa- * Tom. cU. pi. iii. fig. 5. f Ibid. pi. xi. fig. 4. \ Tom. cit. p. 181.§ Les occipitaux lateraux sont chacun divises en deux parties, dont je mevois oblige dappeler la plus externe occipital exterieur. (lb. p. 180.) 686 PROF. OWEN ON THE RANK AND AFFINITIES IN mosal, 27, for the suspension of the tympanic, 28; the pair of hypa-pophyses, i, from the basioccipital, i; the greater proportion of theoccipital surface contributed by the median part of the coalesced Fig. region of skull. parietals, 7, and by the lateral extensions, 7, which are relativelygreater ; the mastoid, 8, moreover, is pushed inwards by the junc-tion of 7 with 27; finally, the large vacuities between 7 and 2-4 *. An extreme modification of the occipital is shown in the Ophidianreptiles. In Python reticulatus the basioccipital forms the lowerpart of the condyle, fig. 3, 1, supported on a short peduncle, on each Fig. 3. Fig. 4.
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
