The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . and always provided with strongmuscles at the base. No Chelonian jiossesses teeth ; buttheir jaws are provided with horny sheaths, with hard andsharp edges, forming a beak like that of a parrot. , The number of Chelonians known at present may beestimated at about 220, the freshwater species being farthe most numerous, and abundant in well-watered districtsof the tropical and su
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . and always provided with strongmuscles at the base. No Chelonian jiossesses teeth ; buttheir jaws are provided with horny sheaths, with hard andsharp edges, forming a beak like that of a parrot. , The number of Chelonians known at present may beestimated at about 220, the freshwater species being farthe most numerous, and abundant in well-watered districtsof the tropical and subtropical zones. Their number andvariety decrease beyond the tropics, and in the north theydisappear entirely about the 50th parallel in the westernand about the 56th in the eastern hemisphere, whilst inthe southern hemisphere the terrestrial forms seem taadvance to 30° S. lat. only. The marine turtles, whichare spread over the whole of tlie equatorial and subtropicalseas, sometimes stray beyond those limit? As in othe* 456 TORTOISE frdeVs of Repti^es, tlie most specialized and the largestforms are restricted to the tropics (with the exception ofAfacric/fmmys) ,but, unlike lizards or snakes, Chelonians Fij. (^ J>yp h\/rt • ^ Ti \ / a,t P ?J ) \ \ \ f^ . ^ KIc .. f ics \. 1 —Sliell (if Teitiido pnrdcis to show tne divisions of tlie infepiiment,Mhlrh nre marked by entile lines, nnd of tlie OHseniis carapncc. tliese ijeinumnrlted by dotted iiiics. Fig I Iluper or dorsal aspect Fig. 2. Lo>*er oi , vent ml Aspect- Dct-mnl Scutes :—ro, coslnls; r, vertebi-nls; m, miii^nals; 9. giilors; pg. p, pectoiHis. ab. ubdnmiiials, pa, pifennuls; an. niiuts * Bones of tlie Carapace;—ro. costals. «(?, neuials; nu, naclial. pj/. Pyffa; .marpluals; rnl. fp, eplplastron; titfo, liyoplaatron; Ityp, Iiypo-plastron; j-j/p, xypliiplastfoii «re unable to exist in sterile districts or at great are strictly animals of plains, or at l
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Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
