. Text book of zoology. Zoology. Fig. 353. A Plesiosaiirian. as in the latter, are clawless, and like the fins of a Whale; they are, however, xisually larger than in the Ichthyosauj-ians, the bones are not so much shortened, and the number of digits does not exceed five. They attaia a length equal to that of the Ichthyostarians. Triassic, Jtu-assic, A Pteroclactyle, restored.—Modified The Fterodactyles {Pterosauria : genera Ptero- dactylus, Bamphm-hynchus, etc.), were specially characterised by the modification of the fore limbs as actual organs of fiight. Each fore limb had four
. Text book of zoology. Zoology. Fig. 353. A Plesiosaiirian. as in the latter, are clawless, and like the fins of a Whale; they are, however, xisually larger than in the Ichthyosauj-ians, the bones are not so much shortened, and the number of digits does not exceed five. They attaia a length equal to that of the Ichthyostarians. Triassic, Jtu-assic, A Pteroclactyle, restored.—Modified The Fterodactyles {Pterosauria : genera Ptero- dactylus, Bamphm-hynchus, etc.), were specially characterised by the modification of the fore limbs as actual organs of fiight. Each fore limb had four digits, of which the thi-ee inner (Nos. 1, 2, 3), were not pai-ticularly developed, whilst the fourth, next to the middle finger, was much elongated, and formed the edge of the large patagium; this membrane, of which several impressions have been found, was stretched from that finger to the body. The head, especially the anterior pait, is of considei-able size; in the sclerotic there was a bony ring; teeth are usually present and placed in sockets; the sternum is provided with a keel, possibly for the attachment of the pectoral muscles, which moved the vrings; the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
