. Comparative anatomy. Anatomy, Comparative. GILL SLITS^ CAVITY DIVERTICULA) COLLAR>v^,l. IRCULAR BAND OF CILIA ''TRUNK CAVITIES Fig. 533.—Balanoglossus embryos. .4. A horizontal section of a young embryo, showing the origin of mesodermal pouches. MacBride and others have noted the similarity of this section to that of a young amphioxus embryo as evidence of the close affinity of two forms. B. A young Balanoglossus larva with five pairs of gill slits viewed from the left side. The gill slits of Balanoglossus bear a striking resemblance to those of Amphioxus. On the other hand the you
. Comparative anatomy. Anatomy, Comparative. GILL SLITS^ CAVITY DIVERTICULA) COLLAR>v^,l. IRCULAR BAND OF CILIA ''TRUNK CAVITIES Fig. 533.—Balanoglossus embryos. .4. A horizontal section of a young embryo, showing the origin of mesodermal pouches. MacBride and others have noted the similarity of this section to that of a young amphioxus embryo as evidence of the close affinity of two forms. B. A young Balanoglossus larva with five pairs of gill slits viewed from the left side. The gill slits of Balanoglossus bear a striking resemblance to those of Amphioxus. On the other hand the young larva of Balanoglossus is strik- ingly like the larva of echinoderms. (Redrawn after Bateson.) ations of the balanoglossus theory of vertebrate ancestry are found by Bateson in the presence of a rudimentary notochord, gill slits resembling those of amphioxus, a dorsal nerve cord which is tubular in the anterior GILL-SUT. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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