. Text-book of embryology. Embryology. me sBsas*sa5a5?aa?i ' Fig. 287.—Two sections through the edge of the blastoderm of Sepia officinalis in different stages of development; to illnstrate the development of the lower layer cells. (After Koeppern, from Minchin's preparations.) A, Younger stage. B, Older stage. A is more highly magnified than B, me, mesoderm, layer cells ; y,mx, yollc-membrane cell. The eyes now appear as shallow cups on the sides of lateral protrusions of the body, which may be termed eye-Stalks. The edges of the Cephalopod shell gland constitute, as in other Mollus
. Text-book of embryology. Embryology. me sBsas*sa5a5?aa?i ' Fig. 287.—Two sections through the edge of the blastoderm of Sepia officinalis in different stages of development; to illnstrate the development of the lower layer cells. (After Koeppern, from Minchin's preparations.) A, Younger stage. B, Older stage. A is more highly magnified than B, me, mesoderm, layer cells ; y,mx, yollc-membrane cell. The eyes now appear as shallow cups on the sides of lateral protrusions of the body, which may be termed eye-Stalks. The edges of the Cephalopod shell gland constitute, as in other Mollusca, the rudiment of the mantle, and underneath them appears a Fig. 288.—Two early embryos of Lolicjo vulgaris. (After Korschelt.) A, An embryo seen from the posterior side. B, A slightly older embryo seen from the anterior side, ar, rudiments of arms ; , mantle-fold ; stomodaeum. ox, optic cup; , optic stalk ; , shell-siic; s(om, deepest behind, which is the rudiment of the mantle-cavity. Just within this groove two buds appear to the right and left of the middle line; these are the rudiments of the gills : whilst below them appear two pairs of ridges converging towards the ventral surface and. 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
