Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . al and distal aspects of the right humerus ;from the Kimeridge Clay of the Isle of Portland. ^. a, trochantericridge ; r, radial, u, ulnar facet. with strongly developed trochanteric ridges. Cervical and ante-rior dorsal vertebrae with pentagonal, subcordiform centra (fig. 7);and the superior costal articulation of the former in great part orentirely on the neural arch (fig. 7); late posterior dorsal and an-terior caudal centra narrowed superiorly. 15 This subgrou
Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . al and distal aspects of the right humerus ;from the Kimeridge Clay of the Isle of Portland. ^. a, trochantericridge ; r, radial, u, ulnar facet. with strongly developed trochanteric ridges. Cervical and ante-rior dorsal vertebrae with pentagonal, subcordiform centra (fig. 7);and the superior costal articulation of the former in great part orentirely on the neural arch (fig. 7); late posterior dorsal and an-terior caudal centra narrowed superiorly. 15 This subgroup includes the most specialized forms, and thosenearly related to Ophthalmosaurus. Ichthyosaurus campylodon, Carter l. Of very large dimensions. Skull stout, with elongated (fig. 11) very large and closely approximated, with thecrowns slightly curved and very coarsely fluted. Centra of ver-tebrae of moderate length, with the cupping of the terminal facesmoderately deep, and a distinct deeper pit in the centre of the an-terior face. Femur (fig. 10) very short, with its trochanteric and Fig. Ichthyosaurus campylodon.—Dorsal, postaxial, and distal aspects of the rightfemur; from the Cretaceous (?Grault) of Russia. -§. a, trochanteric ridge ;t, tibial, f, fibular facet. {After Kiprijanoff.) opposite ridges enormously developed, so as to make the lateralsurfaces of the proximal portion wider than the dorsal. This species was originally described from the Lower Chalk ofCambridgeshire on the evidence of jaws and teeth. Teeth of similartype are found from the Upper Chalk to the Gault, and in theabsence of any evidence to the contrary are referred to the samespecies, although it is quite probable that they may belong to morethan one species. The specimens of humerus and femur (fig. 10)associated with teeth of this type from the Cretaceous of Russia,figured by Kiprijanoff2, show the two distal facets characteristic ofIchthyosaurus, and have a strongly developed troc
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Keywords: ., bookauthorlydekkerrichard184919, bookcentury1800, bookdecade1880
