. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. I20 MORPHOLOGY OF THE ORGANS OF VERTEBRATES. tome cavity retains its connection with the metacoele, the open- ing forming the outer nephrostome (Fig. 126, B'). As was stated above, pro- and mesonephros are the only excretory organs in the ichthyopsida. They appear as larval structures in the amniotes, and only in certain reptiles does either of them function after hatching. In the adult ichthyop- sidan the pro- and mesonephros are usually readUy distinguished, the pronephros being in front, rudimentary in character, and. â ^
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. I20 MORPHOLOGY OF THE ORGANS OF VERTEBRATES. tome cavity retains its connection with the metacoele, the open- ing forming the outer nephrostome (Fig. 126, B'). As was stated above, pro- and mesonephros are the only excretory organs in the ichthyopsida. They appear as larval structures in the amniotes, and only in certain reptiles does either of them function after hatching. In the adult ichthyop- sidan the pro- and mesonephros are usually readUy distinguished, the pronephros being in front, rudimentary in character, and. â ^ * V â ,. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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