. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. w^ 58 ANATOMY OF AMPllIOXUS. â \ !. |. region of the twenty-seventh myotome, where the pharynx ends and the intestine begins. They were discovered in 1875 by Lankester, who called them the atrio-ccclouiic or bnnvn funnels, on account of the rich accumulation of brown pigment in their walls. We have already referred to this brown pigment as occurring very generally in the atrial epithelium. The brown funnels have the shape of an. Fig. 28. â Plastic
. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. w^ 58 ANATOMY OF AMPllIOXUS. â \ !. |. region of the twenty-seventh myotome, where the pharynx ends and the intestine begins. They were discovered in 1875 by Lankester, who called them the atrio-ccclouiic or bnnvn funnels, on account of the rich accumulation of brown pigment in their walls. We have already referred to this brown pigment as occurring very generally in the atrial epithelium. The brown funnels have the shape of an. Fig. 28. â Plastic diagram illustrating the positions and relations of the atrio- coeloinic funnels. A rod is passed through the peri-enteric coelom into tlie sub- chordal (suprapharvngeal) coelom. (After LaNKKSTKR.) ao. Dorsal aort;v. at. Atrial cavity, Atrio-coeloniic funnels, go. Gonads. Ligamentum denticulatum diharyngo-pleural folds, Lankester). /.///. and Left and right metapleural folds. my. Muscles. fli. Roof of ]jharyn\. «. I'oint of union of the right and left aorta' into the median aorta. elongated cone, the apex of which is directed forward.*^. At the wide end each funnel opens into the atrial cavity, while at the narrow end it is possible, but not certain, that an opening exists into the dorsal coelom (Fig. 28). The funnels are adherent throughout their entire length to the roof of the dorsal coelom.'*. 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
Size: 1503px × 1663px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectfishes, bookyear1894
