. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. Verbindung des Kiemenbogen- coclonib mit dem Cavum pericardii. Text'figure 57- Diagrams showing the origin of eye muscles, and the extensions of the primitive coelomic cavity into the gill-arches, in selachian embryos. In A, the cavities of the pharyngeal arches are shown communicating with the pericardial portion of the coelomic cavity; in B, which is a later stage, the connections of these cavities have been lost. 1, 2, 3, 4, gill-clefts; —5, pharyngeal arch extensions of the coelomic cavity; , chorda dorsa
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. Verbindung des Kiemenbogen- coclonib mit dem Cavum pericardii. Text'figure 57- Diagrams showing the origin of eye muscles, and the extensions of the primitive coelomic cavity into the gill-arches, in selachian embryos. In A, the cavities of the pharyngeal arches are shown communicating with the pericardial portion of the coelomic cavity; in B, which is a later stage, the connections of these cavities have been lost. 1, 2, 3, 4, gill-clefts; —5, pharyngeal arch extensions of the coelomic cavity; , chorda dorsalis; , anlagen of the oculomotor muscles; M. ohliq. suf>. and M. , anlagen of the superior oblique and lateral rectus muscles respectively; , otic vesicle. After Corning, 1925, Figs. 222 and 22J; based on Froriep's (1902) Figs. 4 and 5 {Torpedo ocellatus). Figure 27, plate II, portrays a cleared embryo of about 41 complete somites. Like the preceding figure, it appears to have been drawn under unusually high magnification. This embryo exhibits a moderate caudal and a pronounced cervical flexure—the latter presumably unusual for this stage since it does not appear in the stages immediately following. The optic cup shows, more distinctly than heretofore, the outer as well as the inner layer. The otic vesicle is larger, and nearer the branchial region; it is dorsal to the first gill-cleft. The bulbus cordis and the ventral aorta are distinctly outlined and the latter has given rise to the first three aortic arches. The hind-gut is outlined faintly along its ventral border and at both anterior and posterior ends of its dorsal border. The neurenteric canal is well 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 Dean, Bashford, 1867-1928; Gudger, E. W. (Eugene Willis), 1866
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Keywords: ., book, bookcentury1900, booksubjectfishes, booksubjectfishesfossil
