A Monograph of the Fossil Reptilia of the Liassic Formations, Volumes 1-5

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Palaeontographical Society, 1881 - Paleontology
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Page 6 - The transition from the cervical to the dorsal series is effected by the usual elevation of the costal surface by gradational steps continued through about five vertebrae, until a single costal surface is presented by a large diapophysis from the neural arch."* This is precisely what we have here, the diapophysis assuredly having reached its definite elevation. Again, if I am right in conjecturing that the two pieces of rib appertain to one, the sum of these characters would seem to indicate the...
Page 79 - ... difference in weight which it experiences by increase of temperature so inappreciable, that it ought not to be taken into account by any one endeavouring to solve the difficult and important problem of flight. The Montgolfier or...
Page 94 - Descriptive and Illustrated Catalogue of the Fossil Reptilia of South Africa in the Collection of the British Museum.
Page 73 - ... school, impressed with the relations of active locomotion to generation of animal heat, may be pardoned for inferring that the amount of work involved in sustaining a Pterodactyle in the air would make it, physiologically, highly probable that it was a hot-blooded animal.
Page 23 - ... breadth, situated at the angle between the lateral and inferior surfaces, and divided by a smooth, non-articular trait of the lateral surface, of 8 lines in vertical extent from the neurapophysial surface of the centrum ; this is defined below by a slightly curved subangular border, convex downward. The fore surface of the centrum presents a slightly fibrous character, not so smooth as in some other species, nor so irregular as in the PL rugosus, for example. The neural arch is broad and low...
Page 73 - ... remarkably modified respiratory organs ; but it is, to say the least, highly probable that the Pterosauria, if not the Dinosauria, shared some of these characters with them. The amount of work involved in sustaining a Pterodactyle in the air would seem, physiologically, to necessitate proportional oxidation and evolution of waste products in the form of carbonic acid. If so, a proportional quantity of heat must have been evolved, and there must have been a ready means of eliminating the carbonic...
Page 109 - ... the rest of the skeleton, that this extinct reptile was an air-breather, indicates that its tongue was almost as little developed as in the Crocodile ; and since the Ichthyosaurus obtained its food at all times under the same circumstances which necessitate the modification of the hyoid apparatus in the Crocodile, it may be inferred that the hyoid arch was physiologically related to the working of a similar valvular apparatus for defending the orifice of its air-tube from the water admitted into...
Page 79 - The same may be said of the hollow bones, — some really admirable fliers, as the swifts, martins, and snipes, having their bones filled with marrow, while those of the wingless running birds alluded to have air. Furthermore and finally, a living bird weighing 10 Ibs.
Page 60 - The skull ofPferodacfylusis essentially comparable only with that of Birds and Saurians. The preponderating resemblance with the Bird's skull cannot be contested. Against this, however, is a remarkable dissimilarity in certain parts which, on the other hand, approximates it to the type of Saurians.

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