Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 26, 2025
Another set of cases is the production of similar functional results by most diverse means, as in the case of flying animals, birds, pterodactyles, and bats; here there is a widely different modification of the fore-arm and other bones, all for the same purpose. The reader will do well to refer to Mr. Mivart's book on this subject.
Amongst many other obligations which the Author has to acknowledge to Professor Huxley, are the pointing out of this very difficulty, and the calling his attention to the striking resemblance between certain teeth of the dog and of the thylacine as one instance, and certain ornithic peculiarities of pterodactyles as another.
Thus a difficulty presents itself as to the explanation of the three following relationships: That of the Pterodactyles with carinate birds; that of the Dinosauria with struthious birds; that of the carinate and struthious birds with each other.
The breast-bone was large and keeled, as in most birds and in bats, and the shoulder girdle is strikingly similar to that of ordinary birds. All other known pterodactyles have teeth lodged in sockets.
If I went below that, I should come upon the chalk, and there I should find something altogether different, the remains of ichthyosauria and pterodactyles, and ammonites, and so forth. I do not know what Mr.
If I went below that, I should come upon the chalk, and there I should find something altogether different, the remains of ichthyosauri and pterodactyles, and ammonites, and so forth. I do not know what Mr.
Finally, if it was something different from either, how did the carinate birds and pterodactyles take on independently one special common structure when disagreeing in so many; while the struthious birds, agreeing in many points with the Dinosauria, agree yet more with the carinate birds? Indeed by no arrangement of branches from a stem can the difficulty be evaded.
No evidence of past existence of minutely intermediate forms when such might be expected a priori. Bats, Pterodactyles, Dinosauria, and Birds. Ichthyosauria, Chelonia, and Anoura. Horse ancestry. Labyrinthodonts and Trilobites. Two subdivisions of the second relation of species to time.
But to this it may be replied that the ancient common stock could not have had at one and the same time a shoulder structure of both kinds. It must have been that of the struthious birds or that of the carinate birds, or something different from both. If it was that of the struthious birds, how did the pterodactyles and carinate birds independently arrive at the very same divergent structure?
Seeley has shown that in pterodactyles, as in birds, the optic lobes of the brain were placed low down on each side "lateral and depressed."
Word Of The Day
Others Looking