. Chimæroid fishes and their development. Fishes; Chimaeridae. io8 CHIM^ROID FISHES AND THEIR DEVELOPMENT. region is wider and more compressed, the palato-quadrate is reduced and trans- ferred to a more anterior position, nor is it as distinct an element as Schauinsland figures it in the kindred frenus. As further evidence of the more modified character of the skull of Chimsera, we observe that the preorbital ridges are curiously flattened, forming together a transverse brow-plate in the young skull; and that the. Figs. 84 A-D.—Reconstruction of skull of Chimaera embryo shown in plate IX, fig.
. Chimæroid fishes and their development. Fishes; Chimaeridae. io8 CHIM^ROID FISHES AND THEIR DEVELOPMENT. region is wider and more compressed, the palato-quadrate is reduced and trans- ferred to a more anterior position, nor is it as distinct an element as Schauinsland figures it in the kindred frenus. As further evidence of the more modified character of the skull of Chimsera, we observe that the preorbital ridges are curiously flattened, forming together a transverse brow-plate in the young skull; and that the. Figs. 84 A-D.—Reconstruction of skull of Chimaera embryo shown in plate IX, fig. 50. The model is shown in lateral, three-quarters dorsal, and caudal aspects. (l-b. Anterior and posterior points at which the palato-quadrate element has fused with the cranium ; oc, roof of auditory capsule ; cfl, ceratohyal; /o, fora- men through wfiich the ophthalmic nerve passes out of the cranium ; Jos, foramen through which passes the superficial branch of the ophthalmic nerve; C/hf basihyal: hi-h, hypochordal portion of the basis cranii; /(//(, hyomandibular; p/>, pharyngobrancfiial; p^jf, palato-quadrate fissure; pt'O^ preorbital process; pfo, postorbital process; r. median rostral cartilage; s, spiracular cleft later retained as the foramen through which the hyomandibular branch of the seventh nerve passes to the under side of the skull; V- VII, foramen for fifth and seventh nerves. postorbital ridges are reduced in size. We note also the greater width of the cranium in Chim?era and the lesser development of cartilage in the region between the orbits. In short, we can justly conclude that at corresponding stages the skull of Callorhynchus more closely resembles that of a young shark than does the skull of a young Chimaera. The proportions in the case of Callorhynchus are distinctly. 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfishes, bookyear1906
