Image from page 86 of “The encyclopædia britannica; a dictionary of arts, sciences, literature and general information” (1910) – more Marine Life goodness curated by www.SardineRunPE.co.za
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Title: The encyclopædia britannica; a dictionary of arts, sciences, literature and general information
Year: 1910 (1910s)
Authors: Chisholm, Hugh, 1866-1924
Subjects: Encyclopedias and dictionaries Encyclopédies et dictionnaires anglais ENCICLOPEDIAS Y DICCIONARIOS INGLESES Enciclopedias Estrangeiras
Publisher: Cambridge, Eng., New York, At the University press
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive
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Text Appearing Before Image:
the precoracoid. nor the clavicle, as stated by the thought-less. The tail is still best developed in the Chelydridae, shortest inthe Trionychoidea. Since it contains the large copulatorj organ,it is less reduced in the males. No Chelonians possess the slightest TORTOISE ^ traces of teeth, but their jaws are provided with horny sheaths, withhard and sharp edges, forming a beak. The number of Chelonians known at present may be estimatedat about 200, the fresh-water species being far the most numerous,and are abundant in well-watered districts of the tropical andsub-tropical zones. Their number and variety decrease beyondthe tropics, and in the north they disappear entirely about the50th parallel in the western and about the 56th in the easternhemisphere, whilst in the southern hemisphere the terrestrialforms seem to advance to 36° S. only. The marine turtles,which are spread over the whole of the equatorial and sub-tropicalseas, sometimes stray beyond those limits. As in other orders
Text Appearing After Image:
p h) Axfo ,16; F ^feg/ ) / Wjl Tigs, i, 2.—Shell of Testudo pardalis, to show the divisions ofthe integument, which are marked by entire lines, and of theo-seous carapace, these being marked by dotted lines. Fig. I,V^pper or dorsal aspect. Fig. 2, Lower or ventral aspect. Epidermal shields:— CO, Costals. V, Vertebrals. m, Marginals, g, Gulars. pg, Postgulars or humerals. p. Pectorals. ab. Abdominals. pa, Preanals or femorals. an, Anals. Bones of the Carapace;—■ co^, Costals.ne, Neurals.nu, Nuchal.py, Pvgals.m, Marginals.ent, Entoplastroncp, Epiplastron.hyo, Hyoplastron.hyp, Hypoplastron.xyp, Xiphiplastron, of reptiles, the most spedalized and the largest forms arerestricted to the tropics (with the exception of Macroclemmys);but, unlike lizards or snakes, Chelonians are unable to exist insterile districts or at great altitudes. They show a great divergence in their mode of life—someliving constantly on land, others having partly terrestrialpartly aquatic habits, others again
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