. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. NOTES ON SOME EMBRYOS OP CHLAMYDOSELACHUS ANGUINEUS GARM. 99 Cut 2. Four transverse sections passing through the region of Rathke's and Seessel's pouches, of the embryo of 32 mm. There are 47 sections between A & B, 19 between B & C, and 17 bs- tween C & D, each equal to 10 their external openings can be readily recognized from outside. In sections it is seen that the epiblast surrounding the openings is thickened. There is as yet no cloacal opening, but its position is marked by a distinct prominence, where the wa
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. NOTES ON SOME EMBRYOS OP CHLAMYDOSELACHUS ANGUINEUS GARM. 99 Cut 2. Four transverse sections passing through the region of Rathke's and Seessel's pouches, of the embryo of 32 mm. There are 47 sections between A & B, 19 between B & C, and 17 bs- tween C & D, each equal to 10 their external openings can be readily recognized from outside. In sections it is seen that the epiblast surrounding the openings is thickened. There is as yet no cloacal opening, but its position is marked by a distinct prominence, where the wall of the alimentary canal and the skin are in close contact. In the ven- tral view of the head a pit can be seen in the median line directly behind the depression separating the two halves of the upper jaw (fig. 5). This is Rìthke's pouch, or the pituitary involution, which is closely connected with the infundi- bulum. In cut 2 I have reproduced some of the transverse sections passing through this region. In A both the pituitary involution and the infundibulum are to be seen, the former extending for 36 sections (each=10 p.). About mm. behind the posterior border of Rathke's pouch there is another involution,. 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 Nihon Do?butsu Gakkai; To?kyo? Do?butsu Gakkai. Tokyo : Societas
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
