. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. WW ii^ 56 ANAIVMY OF AM PHI OX US. ac of the peculiarities of its organisation. Thanks, however, to recent researches, it is now known to possess such organs in luxuriant abundance. From first to last several entirely different structures have been credited with a renal function. Johannes MuLLER first discovered certain glandular epithe- lial tracts in the floor of the atrial chamber in its hinder portion. These cellular thickenings are distinguished
. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. WW ii^ 56 ANAIVMY OF AM PHI OX US. ac of the peculiarities of its organisation. Thanks, however, to recent researches, it is now known to possess such organs in luxuriant abundance. From first to last several entirely different structures have been credited with a renal function. Johannes MuLLER first discovered certain glandular epithe- lial tracts in the floor of the atrial chamber in its hinder portion. These cellular thickenings are distinguished by their high cylindrical cells from the flattened atrial epi- thelium which surrounds them. (Cf. Figs. 11 and 26.) Johannes Miiller sug- gested that these groups of cells might be renal organs. His observation, however, failed to find general acceptance among morphologists for about thirty-tivc years, when, Fig. 26. — Transverse section throush ^" '^^7^, W. 'H and post-pharyngeal region of youns incliviJual. p.^y^ LaNGERIIANS, WOrk- ti) show Rroii]-)s of renal cells in floor of atrium. (.Xfter and ) ao. Aorta, at. Atrium, Hody-cavity (coelom). ex. Central canal of nerve-cord [). Fin-cavity. Intercu'lic j^,^(| aCCCptcd his intcr- menibrane. and Left and riglU metapleural folds, One of J. Miiller's prctatiou of the bodicS aS renal ;. Sub-intestinal vein. , , ., renal organs, at the same time adding a careful histological description of them (Fig. 27). tnr>. ing independently, fully confirmed his account. 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 Willey, Arthur, 1867-1942. New York; London : Mcmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfishes, bookyear1894
