. Chimæroid fishes and their development. Fishes; Chimaeridae. Fig. 143.—Anterior dorsal fin and its supports. A. Shark. (Squalid); B, Myriacanthus: C. Callorhynchus; D, Chima^ra. trunk; its snout was ffeshy and appears to have terminated in a flap-like tip. Its dental plates, however, are stouter (fig. 124) than in Chimsera, and show fewer localized tritoral areas. Its dor- sal spine was relatively short and robust, and the frontal clasping organ is not unlike that of recent Chim?eroids, save that {cf. figs. 135 and 136) it is more prominent and its ventral margin has a more extended series o
. Chimæroid fishes and their development. Fishes; Chimaeridae. Fig. 143.—Anterior dorsal fin and its supports. A. Shark. (Squalid); B, Myriacanthus: C. Callorhynchus; D, Chima^ra. trunk; its snout was ffeshy and appears to have terminated in a flap-like tip. Its dental plates, however, are stouter (fig. 124) than in Chimsera, and show fewer localized tritoral areas. Its dor- sal spine was relatively short and robust, and the frontal clasping organ is not unlike that of recent Chim?eroids, save that {cf. figs. 135 and 136) it is more prominent and its ventral margin has a more extended series of smaller denticles. In the details of its skeleton, it strikingh' resem- bles recent forms. One may also recall that an egg-capsule, probably of this genus (of a new genus, Aletodus, according to Jaekel), has alread_v been referred to in the present paper, p. 31. It resembles closely the capsule of the recent Callorhynchus. It is clear that in Ischyodus is represented the advancing line of Chimseroids, for it extends from the upper (probably, indeed, from the lower) Jurassic as far as the upper Chalk, even possibly into the Miocene (? /. helvetica), and is represented during this interval by many species of many sizes. Some were probably as small as the recent Chimcera colliei, others must have exceeded 3 meters in 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. Washington, D. C. , Carnegie Institution of Washington
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfishes, bookyear1906
