. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. IIUJII SniOOL ZOOLOGY. 87 lich of lich it igs Iter ir-. Fig. 64.—Diaprram of Heart aud Great Vissclsof riaht side of Meiiobrancli. 9. A coniparisou is nioro easily cffc^ctcMl lu'twccii th(3 heart and gJCNit vessels of the IVleiiobiaiich, and those of Aniia and Lepi- dosteus or one of the Dipnoi, than those of the cattish, because the ventricle has a muscular cone in these forms which is ab- sent in the catfish. From this the arterial trunk comes off in front (Fig. C4) and di- vides into two right and lef
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. IIUJII SniOOL ZOOLOGY. 87 lich of lich it igs Iter ir-. Fig. 64.—Diaprram of Heart aud Great Vissclsof riaht side of Meiiobrancli. 9. A coniparisou is nioro easily cffc^ctcMl lu'twccii th(3 heart and gJCNit vessels of the IVleiiobiaiich, and those of Aniia and Lepi- dosteus or one of the Dipnoi, than those of the cattish, because the ventricle has a muscular cone in these forms which is ab- sent in the catfish. From this the arterial trunk comes off in front (Fig. C4) and di- vides into two right and left branches, which afterwards subdivide to form the three afferent l)ranchial arteries for the three gills. The blood which is aerated in the foremost and largest gill is partly Co. Arterial cone ; v. von- i i i i i • • tri ji ^ Htonuuili; L. iimg; i). dorsal aorta, bomc ot the blood irom the second and third aortic arches reaches the lung (only, however, in a partially aerated condition) through the pulmonary artery, a modified fourth arch ; its aeration is com- plele<l in the lung, wluuice through a separate vessel, the pulmonary vein, it reaches a special compartment of the 'Jum, not quite separated off from the rest, but partly so by an iiiipi'rfect partition. In higher Am}»hibia this j)artition is j)eifect, so that the blood within it is not mixed in the ventricle with the returning venous jtream, until some of it has been already sent on to the head through the moditied fii*st arches (carotid arteries). 10. The kidneys are narrow ribbon-like structures which extend through the greater part of the length of the ])ody cavity. It is supposed that the Menobranchs spawn in spring, and that they lay eggs iK'arly of the size of a |)ea, but further information is desirable as to their habits in this respect. iiilj f. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
