. Text-book of zoology for schools and colleges. Zoology. ANIMALS. ,. ^ t ^\r^a- a continuous fringe round the compressed t^l!tfsu?p^Ael by cartilaginous Fig. IW.—LepidoHrm amMctem, the Mnd-flflh. p Pectoral Embs; i Tentral limbs. The skull is composed of distiact bones, and there is a lower jaw, but the notochord is persistent, and there are no bodies of vertebrae developed. The respiratory organs are twofold, consisting, firstly, of free filamentous branchiae or giUs, contained in a branchial chamber, which opens externally by a single vertical giU-slit; and, secondly, of
. Text-book of zoology for schools and colleges. Zoology. ANIMALS. ,. ^ t ^\r^a- a continuous fringe round the compressed t^l!tfsu?p^Ael by cartilaginous Fig. IW.—LepidoHrm amMctem, the Mnd-flflh. p Pectoral Embs; i Tentral limbs. The skull is composed of distiact bones, and there is a lower jaw, but the notochord is persistent, and there are no bodies of vertebrae developed. The respiratory organs are twofold, consisting, firstly, of free filamentous branchiae or giUs, contained in a branchial chamber, which opens externally by a single vertical giU-slit; and, secondly, of true lungs, in the form of a double cellular air-bladder communicating with the guUet by means of an air-duct or windpipe. Sometimes, if not always, there are rudimentary external gUls as well, placed on the side of the neck. The heart consists of a ven- tricle, and of two auricles, divided from one another by an incomplete partition. Lastly, the nasal sacs open behind into the throat, and do not form closed chambers opening only by the nostrils, as they do in all other fishes, except the Myxi- noids. The two best-known species are the Lepidosirm paradoxa from the Amazons, and the L. annectens from the Gambia. They both inhabit marshy tracts, and both appear to be able in the dry season to bury themselves in the mud, and to form a kind of chamber, in which they remain dormant till the rains of the wet season set them free-. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
