. Principles of economic zoo?logy. Zoology, Economic. PISCES 201 Excretion.—The nephridea unite in a pair of large kidneys. The ureter may or may not empty into a urinary bladder. Circulation (Fig. 160).—The heart is surrounded by a peri- cardium. It consists of sinus venosus, auricle, ventricle, and conus arteriosus. The blood, which is red, goes from the gills over the body. The veins collect it and return it to the sinus Branchial artery. Arterial bulb v Ventricle of the , Auricle of the heart-— Venous sinus- Vena portse, liver, etc Intestine—' Vena cavL". Branchial vessels Dor
. Principles of economic zoo?logy. Zoology, Economic. PISCES 201 Excretion.—The nephridea unite in a pair of large kidneys. The ureter may or may not empty into a urinary bladder. Circulation (Fig. 160).—The heart is surrounded by a peri- cardium. It consists of sinus venosus, auricle, ventricle, and conus arteriosus. The blood, which is red, goes from the gills over the body. The veins collect it and return it to the sinus Branchial artery. Arterial bulb v Ventricle of the , Auricle of the heart-— Venous sinus- Vena portse, liver, etc Intestine—' Vena cavL". Branchial vessels Dorsal artery —I -Kidneys Dorsal artery or aorta Fig. 160.—The circulatory apparatus of a fish. (Tenney.) venosus, from which it passes through the parts of the heart in the order named, and the circulation begins anew. Respiration is by gills except in the lung fishes, which take the mechanically dissolved air from the water and give off waste matter. The gills arise as paired pouches of the pharynx and open on the exterior by gill-slits. They are attached to the branchial arches and are persistent through 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1915
