. Text-book of embryology. Embryology. ap (. map Pio. 179.—Two sections througli the developing stercoral pocket and Malpighian tubes of Agelena labyrinthica, (After Kautsch.) A, the posterior section. B, the anterior section, miap, rudiment of Malpighian tube ; sUiT, rudiment of stercoral pocket. in addition to the coxal gland (Figs. 179 and 180). The ectoderm of the ventral face of the caudal lobe is thickened so as to form the so-called anal ganglia, which arise at the posterior point of union of the two longitudinal rudiments of the nervous system. Just in front of this point the proctodae
. Text-book of embryology. Embryology. ap (. map Pio. 179.—Two sections througli the developing stercoral pocket and Malpighian tubes of Agelena labyrinthica, (After Kautsch.) A, the posterior section. B, the anterior section, miap, rudiment of Malpighian tube ; sUiT, rudiment of stercoral pocket. in addition to the coxal gland (Figs. 179 and 180). The ectoderm of the ventral face of the caudal lobe is thickened so as to form the so-called anal ganglia, which arise at the posterior point of union of the two longitudinal rudiments of the nervous system. Just in front of this point the proctodaeum appears as an ectodermal in- vagination, and this invagination soon afterwards will open into the stercoral pocket. The persisting abdominal appendages now undergo further changes. On the posterior aspect of the first two pairs, near their bases, an eotodermic invagination is In the case of the first pair this invagination forms the lung sac. This appendage develops on its upper and posterior face outstanding folds which are the rudiments of the first lung-lamellae. The other lamellae of the lung are formed by outgrowths from the thickened ventral wall of the lung sac—or to put it in another way, from the basal portion of the appendage. The credit of having given the first clear account 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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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
