. The Cambridge natural history. Zoology. AIR-BLADDER 299. is still further sacculated by finer branches of the principal iibrous bands/ In the Amiidae the bladder ia very larce, and, except that a short median cleft divides it in front into two short caeca, it is unpaired. Internally, its walls are much sacculated, but the alveoli are smaller and arranged less regularly than in Lepidosteus. The aperture of communication with the oesophagus is dorsally situated. It may be mentioned that in all the preceding Teleostomi the ductus fiq. 175.—Portion of the air pneumaticus is remarkably short, the
. The Cambridge natural history. Zoology. AIR-BLADDER 299. is still further sacculated by finer branches of the principal iibrous bands/ In the Amiidae the bladder ia very larce, and, except that a short median cleft divides it in front into two short caeca, it is unpaired. Internally, its walls are much sacculated, but the alveoli are smaller and arranged less regularly than in Lepidosteus. The aperture of communication with the oesophagus is dorsally situated. It may be mentioned that in all the preceding Teleostomi the ductus fiq. 175.—Portion of the air pneumaticus is remarkably short, the connexion between the air-bladder and the oesophagus being almost direct by means of a larger or smaller oriifice, which, except in Acipenser, is more anteriorly placed than in most other Teleostomi; and further that, unlike many Teleosts, there are no special " retia mirabilia," bodies," or " red ; In the Dipnoi the structural resemblance of the air-bladder to a true lung, which to some extent is indicated in Poly- pterus, Amia, and Lepidosteus, becomes still more marked. In Neoceratodus'^ the organ is not imlike that of Lepi- dosteus, and takes the form of a spacious unpaired sac, extending from one end of the abdominal cavity to the other. On its inner surface bladder, with the ventral wall removed, and the glottis, of Lepidosteus. , Air- bladder ; gl, glottis ; s, bulg- ing of the hinder wall of the vestibnle into the cavity of the air - bladder ; y, cleft leading from the air-bladder into the vestibnle. (From Wiedersheim.) red. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
