. Chordate morphology. Morphology (Animals); Chordata. periblast entoderm neural groove , ^ 1 ectoderm notochord ^/^' /pVN ,somite lateral plate vitelline blastopore ^ C^C ^ ^ ^O ^^ '^? -" rOc <^C^ n'~c ^^ c' ^ / " yolk ^morginal sinus (venous) Figure 7-10. Stoges of the shark. A, first cleavage groove; B, early cleavage of Torpedo; C, early cleavage of Torpedo in section; D, blostulo of Torpedo; E, blastoderm of Scyllium undergoing gas- trulotion; F, sagittal section of blastoderm shown in E (along line a); G, cross section of blastoderm seen in E (along line b); H, early neurula
. Chordate morphology. Morphology (Animals); Chordata. periblast entoderm neural groove , ^ 1 ectoderm notochord ^/^' /pVN ,somite lateral plate vitelline blastopore ^ C^C ^ ^ ^O ^^ '^? -" rOc <^C^ n'~c ^^ c' ^ / " yolk ^morginal sinus (venous) Figure 7-10. Stoges of the shark. A, first cleavage groove; B, early cleavage of Torpedo; C, early cleavage of Torpedo in section; D, blostulo of Torpedo; E, blastoderm of Scyllium undergoing gas- trulotion; F, sagittal section of blastoderm shown in E (along line a); G, cross section of blastoderm seen in E (along line b); H, early neurula or primitive streak stage of Squo/us (stage 13); I, sagittal section of primitive streok stage; J, sagittal section of neurula of 1 0 or 1 1 somites of Squa/us); K, cross section of J in region of somites; L, toil bud stage (stage 1 8). (After Ziegler, Rijckert; Witschi, 1956, and Nelsen, 1953) 204 • EMBRYOGENESIS OF THE CHORDATES. 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 Jollie, Malcolm. New York, Reinhold
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