. Outlines of zoology. important types maybe ranked. Along with thesemay be included the remarkableProierosaurus bom the Permian,though Seeley establishes for ita special order—Proterosauria,as distinguished from Rhyncho-cephalia. According to Baur,quoted by Nicholson andLydekker, the Rhyncho-cephalia, together with theProterosauria, to which theyare closely allied, are Certainlythe most generalised group ofall Reptiles, and come nearest,in many respects, to that orderof Reptiles from which all otherstook their origin. Order LacertiliaLizards General Characters.— T/ie body is usually wellcover
. Outlines of zoology. important types maybe ranked. Along with thesemay be included the remarkableProierosaurus bom the Permian,though Seeley establishes for ita special order—Proterosauria,as distinguished from Rhyncho-cephalia. According to Baur,quoted by Nicholson andLydekker, the Rhyncho-cephalia, together with theProterosauria, to which theyare closely allied, are Certainlythe most generalised group ofall Reptiles, and come nearest,in many respects, to that orderof Reptiles from which all otherstook their origin. Order LacertiliaLizards General Characters.— T/ie body is usually wellcovered with scales. Inmost, both, fore- and hind-limbs are developed andbear clawed digits, but eitherpair or both pairs may beabsent. The pectoral andpelvic girdles are always present, in rudiment at is a sternum and a T-shaped episternum. Unlikesnakes, lizards have non-expansible mouths. The maxillcSypalatines, and pterygoids are fixed, and there is usuallya mandibular symphysis. There are almost Fig. 338.—Hyoid apparatus of aChelonian. BH., Body of the hyoid Cbasihyal);/T., representing another part of thehyoid ^rch; , anterior cornu,representing the ^ jirst hranchialarch ; posterior cornu, repre-senting the second branchial arch. LACERTILIA. 621 movable eyelids and external ear-openings. The teethare fused to the edge or to the ridge of the jaws, neverplanted in sockets. The tongue, broad and short in some, Geckos and Iguanas, long and terminally clubbedin Chamaleons, is oftenest a narrow bifid organ of touch.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
