. Text-book of embryology. Embryology. 42 INVEETEBEATA CHAP. cesses and adhere to the substratum; the process of attachment of the larva to the substratum is known as fixation. The larva is thus converted into a closed cylinder, the wall of. Fig. 20.—A late stage ia the metamorphosis of the Ascon stage of Sycandra into the adult condition. (After Maas.) Letters as in Fig. 19. which consists of an outer layer of flattened cells, and an inner layer composed of ciliated cells, on each of which the collar soon makes its appearance. This collar is characteristic of the cells lining the fl
. Text-book of embryology. Embryology. 42 INVEETEBEATA CHAP. cesses and adhere to the substratum; the process of attachment of the larva to the substratum is known as fixation. The larva is thus converted into a closed cylinder, the wall of. Fig. 20.—A late stage ia the metamorphosis of the Ascon stage of Sycandra into the adult condition. (After Maas.) Letters as in Fig. 19. which consists of an outer layer of flattened cells, and an inner layer composed of ciliated cells, on each of which the collar soon makes its appearance. This collar is characteristic of the cells lining the flagel- lated chambers in all Porifera. Between the two layers a layer of. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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