. A manual of zoology. Zoology. Fig. 161. Flfi. 162. Fig. IdX.—Olynthus. (After Haeokel.) e, spicules; j, eggs; o, osoulnm; p, pores; «, stomach.* Fig. 163.—Section of wall of Sucnndra raphnnus. (After Schulze.) e, ectodermal epitbelium; en, collared flagellate cells; m, mesoderm witli connective-tissue cells; o, eggs; st, calcareous spicules. tissue permeated with branching cells (fig. 1G2) covered externally by a thin layer of pavement epithelium which is easily destroyed. This epithelium (earlier called ectoderm) and the connective tissue (mesoderm) are now regarded as a common layer, ' mes
. A manual of zoology. Zoology. Fig. 161. Flfi. 162. Fig. IdX.—Olynthus. (After Haeokel.) e, spicules; j, eggs; o, osoulnm; p, pores; «, stomach.* Fig. 163.—Section of wall of Sucnndra raphnnus. (After Schulze.) e, ectodermal epitbelium; en, collared flagellate cells; m, mesoderm witli connective-tissue cells; o, eggs; st, calcareous spicules. tissue permeated with branching cells (fig. 1G2) covered externally by a thin layer of pavement epithelium which is easily destroyed. This epithelium (earlier called ectoderm) and the connective tissue (mesoderm) are now regarded as a common layer, ' meso- ectoderm,' since it has been shown that the pavement epithelium is often genetically only connective-tissue cells which have spread over the surface. On the other hand there is a distinctly differen- tiated entoderm in the shape of a one-layered flagellate epithelium lining the stomach, the cells of which (en) recall the Choanoflagellata. 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
Size: 1904px × 1312px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
