. Text-book of embryology. Embryology. Fig. 18.âTwo stages in the fixation of the larva of Sycandra raphanus. (After Schulze.) A, the flagellated cells are just retreating into the interior. B, the larva has assumed the form of a hemispherical cup and is attached by amoeboid f)rocesses of the outer granular layer. Seen in optical section, fi, flagellated cells ; gr, granular cells ; p, porocytes (?). of the cavity of invagination are granular, and when the ciHated cells become invaginated, these granular cells extend inwards. Fig. 19.âAn early stage in the metamorphosis of the Ascon stage of S
. Text-book of embryology. Embryology. Fig. 18.âTwo stages in the fixation of the larva of Sycandra raphanus. (After Schulze.) A, the flagellated cells are just retreating into the interior. B, the larva has assumed the form of a hemispherical cup and is attached by amoeboid f)rocesses of the outer granular layer. Seen in optical section, fi, flagellated cells ; gr, granular cells ; p, porocytes (?). of the cavity of invagination are granular, and when the ciHated cells become invaginated, these granular cells extend inwards. Fig. 19.âAn early stage in the metamorphosis of the Ascon stage of Syamdra raphanus into the adult. (After Maas.) A, external view of young sponge. B, diagrammatic longitudinal section of the same to show the gradual displacement of collar cells by granular cells. C, a small portion of such a section further enlarged. cTi, radial flagellated chamber; fi, flagellated cells; gr, granular cells (in C the reference line points to a spot where the granular cells are migrating inwards); os, osculum ; p, inhalent pore; â pg, paragaster. along the substratum, and floor the cavity of the invagination (Fig. 18); they also extend outwards in irregular tongue-like pro-. 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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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
