. Chimæroid fishes and their development. Fishes; Chimaeridae. Fig. 141.—Myriacanthus granulatus. Detail of snout region. After specimen presented to Jermyn Street Museum by Captain Ibbetson. As indicated in dorsal aspect, the snout is broad and thickly studded with dermal tubercles. The frontal clasping spine appears somewhat in its relative position. The denial plates are Fig. 142.^Mandible of Myriacanthus, viewed from in front. Restoration after one of Egerlon's specimens in the British Museum. Brief mention need only be made of the Jurassic genera Ganodus (fig. 121) and Brach
. Chimæroid fishes and their development. Fishes; Chimaeridae. Fig. 141.—Myriacanthus granulatus. Detail of snout region. After specimen presented to Jermyn Street Museum by Captain Ibbetson. As indicated in dorsal aspect, the snout is broad and thickly studded with dermal tubercles. The frontal clasping spine appears somewhat in its relative position. The denial plates are Fig. 142.^Mandible of Myriacanthus, viewed from in front. Restoration after one of Egerlon's specimens in the British Museum. Brief mention need only be made of the Jurassic genera Ganodus (fig. 121) and Brachymylus, since these forms are known only by detached dental plates. It is possible, however, that a more or less complete skeleton of Ganodus* is preserved in the Museum at Northampton (Smith Woodward, 1892), and, in this event, its structures closely resemble Ischvodus. f *This specimen, a male, lacks the rostrum, but shows the frontal clasping organ ; of the latter the base is expanded transversely, and shows, as in Myriacanthus and Squaloraja (figs. 134 a and 137 a), a faint median crest on its attached face; its sides are laterally compressed. The column shows ring thickenings. Its dorsal spine is slender and arched (= Lepracanthus). fSince the foregoing was written I have reexamined the specimen of " Ganodus " uti/iis in the Munich Museum, and am inclined to agree with its determination as Ischyodus by Reiss and Smith Woodward. It is quite possible, however, that this specimen will be shown to represent a new genus as soon as a more definite knowledge of Ischyodus is obtained. Thus the present specimen has small orbits, small snout, and large dermal denticles, the latter scattered widely, especially conspicuous in the region just anterior to the ventral fin. There is also ground for the belief that a pair of dermal plates were present on or near the posterior rim of the Please note that these images are extracted from scanned page images that may ha
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