. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. ^ ssary ent it cjclat- :lefts. itcrial I Willi Ul-bar. -o two { their to one every shorter rm the 2 inter- mrsy or ,ry bars - latter, ings in opening r down- jes with formed atement Id be as signified ill-clefts, bdivided, all cross- another, ly fusing ner faces IN TERXA L AXA 7 OM Y. 29 Evolution of the T/iyf/iiis Gland. Tongue-bars, like those occurring in the gill-slits of Amphioxus, are only known otherwise to occur in the remarkable worm-like cre
. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. ^ ssary ent it cjclat- :lefts. itcrial I Willi Ul-bar. -o two { their to one every shorter rm the 2 inter- mrsy or ,ry bars - latter, ings in opening r down- jes with formed atement Id be as signified ill-clefts, bdivided, all cross- another, ly fusing ner faces IN TERXA L AXA 7 OM Y. 29 Evolution of the T/iyf/iiis Gland. Tongue-bars, like those occurring in the gill-slits of Amphioxus, are only known otherwise to occur in the remarkable worm-like creature, Balntioglossits. In the higher Vertebrates they appear to be entirely absent, but in the course of the development of the higher forms there is a structure which arises from the dorsal wall of the gill-slits which may very well be the homologue <.)f the tongue-bars of Amphioxus. This structure is the ol£ vel pb-b nph c^i i^t. Fig. —Anterior region of younc; Amphioxus from left side. (After W' ; tlio renal tubules inserted after I'>in'i;KI.) (//. Atrium, ci. Buccal cirri, c/i. Notochord. Dorsal fin-elianibers. v. s]iot. £•/,'(/. Endostyle. /lep. Outgrowin' ff. -'Xi, ti;. 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
