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A Monograph on the Fossil Reptilia of the Wealden Formations
Eingeschränkte Leseprobe - 2015
anchylosed angle antero-posterior diameter articular end articular surface articulation base body bone border breadth British Museum canal carapace caudal vertebrae cavity centrum cervical vertebrae Cetiosaurus characters compressed condyle convex coracoid costal plates Crocodiles Crocodilian crown Cuvier dentary diapophysis dorsal vertebrae expanded extent extremity femur flattened foramina fore FOSSIL REPTILIA genus humerus Hylaeosaurus Iguana Iguanodon inches in length inner side interspace Isle of Wight Lacertian lines Lizards longitudinal lower jaw Mantell Mantellian Collection medullary Megalosaurus metapodial middle Monograph neural arch neural plate neural spine neurapophysis oblique Oolitic outer side parapophysis Pelorosaurus phalanx plastron Pleurosternon portion posterior present proportion proximal end Purbeck ramus reptile resembles ribs ridge sacral vertebrae sacrum Saurian scapula scutes shaft skeleton slightly concave species specimen Stonesfield Streptospondylus Sussex suture teeth terminal thick tibia Tilgate Forest tooth transverse diameter transverse process tubercle ungual phalanges vascular Vertical diameter Wealden Wealden of Tilgate young Iguanodon
Seite 20 - Iguanodon, and the magnitude of the anterior outlets which gave exit to the vessels and nerves that supplied the front of the mouth, indicate the great development of the integuments and soft parts with which the lower jaw was invested.
Seite 52 - ... with the longest femora or humeri. This characteristic is nevertheless one of the most important towards a restoration of the extinct reptile, since an approximation to a true conception of the size of the entire animal coxild only be made after the general proportions of the body to the extremities had been ascertained.
Seite 36 - ... inches across, a proportion which corresponds with that of the acetabular concavity in the ilium, and with the size of the cavity in which the head of the Iguanodon's femur must have been received. One angle of the, cavity corresponding with the anterior one in the Varanus, is raised ; a broad and low obtuse ridge bounds the rest of the free margin of the cavity. The smooth labrum exchanges its character near one of the fractured edges of the bone for a rough surface, which indicates the commencement...
Seite 53 - Iguanodon would be 1 1 feet 5 inches ; which is about equal to that of the Megatherium. If there be any part of the skeleton of the Iguana which may with greater probability than the rest be supposed to have the proportions of the corresponding part of the Iguanodon, it is the lower jaw, by virtue of the analogy of the teeth and the substances they are adapted to prepare for digestion. Now the lower jaw gives the length of the head in...
Seite 52 - Iguanodon; and, hence, the dimensions of 100 feet in length arrived at by a comparison of the teeth and clavicle of the Iguanodon with the Iguana, of 75 feet from a similar comparison of their femora, and of 80 feet from that of the claw-bone, which, if founded upon the largest specimen from Horsham, instead of the one compared by Dr. Mantell *, would yield a result of upwards of 200 feet for the total length of the Iguanodon, since the Horsham phalanx exceeds the size of the largest of the recent...
Seite 19 - England,' pi. ii. fig. 5, the resemblance of which to the ' os quadratum,' or tympanic bone of birds, was first suggested by Dr. Hodgkin, is assigned to the Iguanodon by Dr. Mantell. He accurately describes it " as forming a thick pillar or column, which is contracted in the middle, and terminates at both extremities in an elliptical and nearly flat surface.
Seite 9 - It is this structure, beautifully exemplified in the sacrum of the young ostrich, which Creative Wisdom adopted to give due strength to the corresponding region of the spine of a gigantic Saurian species, whose mission in this planet had ended probably before that of the ostrich had begun.
Seite 23 - Had the serrature continued along 51* the whole of the blunt and convex portion of the tooth, it would, in this position, have possessed no useful cutting power; it ceased precisely at the point beyond which it could no longer be effective. In a tooth thus formed for cutting along its concave edge, each movement of the jaw combined the power of the knife and saw ; whilst the apex, in making the first incision, acted like the two-edged point of a sabre. The backward curvature of the full grown teeth,...