. Text-book of embryology. Embryology. Fio. 180.—Sagittal sectiou through the hinder part of the abdomen of Agelena lahyrintMca to show the hinder part of the mid-gut developing in connection with the stercoral poolcet. (After Kautsch.) , dorsal longitudinal muscles ; , rudiment of hinder part of mid-gut; sp, spinneret; , spinning gland; , ventral longitudinal abdominal appendages. They appear after birth (Fig. 182, C). The cephalic lobes have now fused in the middle line, and their semicircular grooves have also fused at one point. These grooves now begin to be c
. Text-book of embryology. Embryology. Fio. 180.—Sagittal sectiou through the hinder part of the abdomen of Agelena lahyrintMca to show the hinder part of the mid-gut developing in connection with the stercoral poolcet. (After Kautsch.) , dorsal longitudinal muscles ; , rudiment of hinder part of mid-gut; sp, spinneret; , spinning gland; , ventral longitudinal abdominal appendages. They appear after birth (Fig. 182, C). The cephalic lobes have now fused in the middle line, and their semicircular grooves have also fused at one point. These grooves now begin to be closed in from the exterior, and the last portions to remain open are the most posterior parts of their inner limbs. Just above the spots where these grooves finally close, a pair of ectodermic invaginations mark Fig. 181.—Longitudinal section through the abdominal appendages of an embryo of Agelena labyrinthica, to show the origin of the lung book. (After Kautsch.) a&ij a&2, a63, the first, second, and third abdominal appen- dages respectively ; cogi, co^, coe3, the coelomic sacs belonging to the first three abdominal segments; , lung lamellae; hs, lung 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
