. A manual of zoology. Zoology. Fig, 107.—Formation of the mesencliyme and beginning of gastmlation in Holofhnn'a tiihuUisd. (After 8elenka, from Balfour.) cf, cleavage caviti^; ep, ectoderto; hy, entoderm; ;/(.s, mesencliyme cells; ae, archenteron. is called mesoilieliuin. The mesothelium is cut off from the entoderm, the mode of development being shown in the embryology of the worm Sagitlii (fig. 108). A n. Fig. —F )rm ition of the Tin sr tlu Inim and radoni of Sn<titia. A. From tlie hottom of the ^ o^triil I iiise two tol K ^^llI h di\'ide the archenteron into the permanent diget^tn
. A manual of zoology. Zoology. Fig, 107.—Formation of the mesencliyme and beginning of gastmlation in Holofhnn'a tiihuUisd. (After 8elenka, from Balfour.) cf, cleavage caviti^; ep, ectoderto; hy, entoderm; ;/(.s, mesencliyme cells; ae, archenteron. is called mesoilieliuin. The mesothelium is cut off from the entoderm, the mode of development being shown in the embryology of the worm Sagitlii (fig. 108). A n. Fig. —F )rm ition of the Tin sr tlu Inim and radoni of Sn<titia. A. From tlie hottom of the ^ o^triil I iiise two tol K ^^llI h di\'ide the archenteron into the permanent diget^tn ( tl ict andthecalomn duerticula. B. The separation is almost com- pleted bs the pushing up of tlie folds, ale, outer, »i)r, mid<lle, ih\ inner germ- layer; iMfc', somatic layer; ink'', splanchnic layer; Vi, body-cavity. Coelomic Pouches.—AMicii the of Sni/i/fa h;is licen formed two folds arise from the archenteric walls ojiposito the bliistoporo (^1), thus jiartially separating a pair of lateral chambers from tlic rest. The jirorcss continues; tlie blastopore closes, Avhile. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
