. Comparative anatomy and physiology. Chap. III.] G A NO I DEI. the gill chamber is covered in by a bony plate, oper- culuin; the renal ducts do not open into a depression (cloaca) common to them and the anus. In all Ga- noids, and in one great division of the Teleostei, the air sac on the dor- sal surface of the body opens by a duct into the O3so- phagus. The recent Ga- noidei fall into two divisions: a. Selachoi- dei; * such are the Sturgeons (Aci- penser) and Poly- odon ; in these the skull consists of persistent cartilage, overlaid by bones developed in the investing m e m - brane ; spirac
. Comparative anatomy and physiology. Chap. III.] G A NO I DEI. the gill chamber is covered in by a bony plate, oper- culuin; the renal ducts do not open into a depression (cloaca) common to them and the anus. In all Ga- noids, and in one great division of the Teleostei, the air sac on the dor- sal surface of the body opens by a duct into the O3so- phagus. The recent Ga- noidei fall into two divisions: a. Selachoi- dei; * such are the Sturgeons (Aci- penser) and Poly- odon ; in these the skull consists of persistent cartilage, overlaid by bones developed in the investing m e m - brane ; spiracles are persistent, and the body is either naked, or has bony plates developed in the dermis (Fig. 46). * ii!:,!,1; .. :!',. •'. •• 'i: ii "''. 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1885
