Water Reptiles of the Past And Present
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The arm bones, as shown in Fig. 84, are strikingly Fig. 83. — Dorsal ver- tebra of Thalattosaurus .
(After Merriam.) J 74 WATER REPTILES OF THE PAST AND PRESENT like those of the mosasaurs, as will be seen by comparing the figure on p. 157. The humerus is a little more elongated than that of the mosasaurs, more nearly like the mosasaurian femur. The shoulder-blade and the coracoid are imperfectly ossified, as is seen from the figure — another characteristic of aquatic life. What the fingers and... toes were like cannot be said; probably they were bound together by membrane, forming swimming paddles similar to those of the mosasaurs. Some of the bones referred to the pelvis are known, but it is not known whether they are united to the spinal column by a sacrum, as in land animals.
Nor is anything certainly known of the hind leg or much of the tail. Since the front legs show marked aquatic adapta- tions, it is altogether certain that the hind legs will be found to be modified more or less, though not so much modified as the front legs, because, as we have seen, the front legs are always more specialized in aquatic animals than the hind ones, even as the hind legs are more specialized than the front ones in land animals.
What to read after Water Reptiles of the Past And Present?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Wendell Williston to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The arm bones, as shown in Fig. 84, are strikingly Fig. 83. — Dorsal ver- tebra of Thalattosaurus .
(After Merriam.) J 74 WATER REPTILES OF THE PAST AND PRESENT like those of the mosasaurs, as will be seen by comparing the figure on p. 157. The humerus is a little more elongated than that of the mosasaurs, more nearly like the mosasaurian femur. The shoulder-blade and the coracoid are imperfectly ossified, as is seen from the figure — another characteristic of aquatic life. What the fingers and... toes were like cannot be said; probably they were bound together by membrane, forming swimming paddles similar to those of the mosasaurs. Some of the bones referred to the pelvis are known, but it is not known whether they are united to the spinal column by a sacrum, as in land animals.
Nor is anything certainly known of the hind leg or much of the tail. Since the front legs show marked aquatic adapta- tions, it is altogether certain that the hind legs will be found to be modified more or less, though not so much modified as the front legs, because, as we have seen, the front legs are always more specialized in aquatic animals than the hind ones, even as the hind legs are more specialized than the front ones in land animals.
What to read after Water Reptiles of the Past And Present?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Wendell Williston to read onlineMoreLess
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