. Outlines of zoology. Zoology. SKELETON. S7i temporal The orbit is roofed by a series of small bones, of which the anterior and posterior are respectively known as pre- and post-frontal. On the floor of the adult skull there is a large basal bone, composed of fused occipital and sphenoidal elements, and continued forward as a slender bar (parasphenoid). This bone gives off two stout processes, the basipterygoid processes, which articulate with the pterygoids. Each. Fig. 248.—Side view of skull of Lacerta.—After W. K. Parker. px., Premaxilla; mx., maxilla; /., lachrymal;/, jugal;
. Outlines of zoology. Zoology. SKELETON. S7i temporal The orbit is roofed by a series of small bones, of which the anterior and posterior are respectively known as pre- and post-frontal. On the floor of the adult skull there is a large basal bone, composed of fused occipital and sphenoidal elements, and continued forward as a slender bar (parasphenoid). This bone gives off two stout processes, the basipterygoid processes, which articulate with the pterygoids. Each. Fig. 248.—Side view of skull of Lacerta.—After W. K. Parker. px., Premaxilla; mx., maxilla; /., lachrymal;/, jugal; , transpalatine; epg., epipterygoid ; pg., pterygoid; bpg., basi- pterygoid; , basioccipital; >/., quadrate; , occipital condyle ; sq., squamosal ;, pro-otic ;, postorbital; sii. sts., supratemporals ; presphenoid (the optic nerve is seen issuing in front of the end of the reference line); , mes- ethmold ; , supraorbitals; pf., prefrontal ; «., nasal ; articular; ag., angular; sag., surangular; cr., coronary; d., dentary. pterygoid is connected posteriorly to the quadrate bone of the corre- sponding side, and anteriorly with the palatine. From the union of pterygoid and palatine, a stout os transversum or transpalatine extends outwards to the maxilla. In front of the palatines lie the small vomers, which, in their turn, articulate with the premaxilla and maxilla, both of which are furnished with small pointed teeth. In the posterior region of the skull we have still to notice the large ex-occipitals with which the opisthotics are fused, and which are continued into the conspicuous parotic processes. The lateral walls of the brain-case are largely formed. 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasg
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
