. A guide to the study of fishes. Fishes; Zoology; Fishes. 24 The Ganoids For the group here called Lepidostei nximerous other names have been used corresponding wholly or in part. Rhombo- ganoidea of Gill covers nearly the same groups; Holostei of Miiller and Hyoganoidea of Gill include the Halecomorphi also; Ginglymodi of Cope includes the garpikes only, while v^theo- spondyli of Woodward includes the AspidorhynchidcE and the Fig. 14.—Semionotus kapffi Fraas, restored. Family Semionotidoe. (After Fraas, per Nicholson.) The SemionotidcB (Stylodontidce) are robust-bodied Ganoids, ha
. A guide to the study of fishes. Fishes; Zoology; Fishes. 24 The Ganoids For the group here called Lepidostei nximerous other names have been used corresponding wholly or in part. Rhombo- ganoidea of Gill covers nearly the same groups; Holostei of Miiller and Hyoganoidea of Gill include the Halecomorphi also; Ginglymodi of Cope includes the garpikes only, while v^theo- spondyli of Woodward includes the AspidorhynchidcE and the Fig. 14.—Semionotus kapffi Fraas, restored. Family Semionotidoe. (After Fraas, per Nicholson.) The SemionotidcB (Stylodontidce) are robust-bodied Ganoids, having the vertebrse developed as rings, the jaws with several rows of teeth, those of the outer row styliform. Semionotus bergeri is a well-known species, with the body moderately elongate. Semionotus agassizi and many other species occur in the Triassic of the Connecticut valley and in New Jersey. The body is very deep in the related genus Dapedium, and the head is covered with strong bony plates. Dapedium politum is a well-known species of the English Triassic. Tetra- gonolepis (Pleurolepis) is a similar form, very deep and com- pressed, with strong, firm scales. In the extinct family of Lepidotidce the teeth are conical or chisel-shaped, while blunt or molar teeth are on the inside of the mouth, which is small, and the suspensorium of the mandible is vertical or inclined forward. The body is robust-fusiform, covered with rhomboid scales; the vertebrae form rings about the notochord; the teeth are either sharp or blunt. The dorsal fin is short, with large fulcra. The best known of the niomerous genera are Lepidotes rather elongate in body, with large, blunt teeth. Of the many species of Lepidotes, Lepidotes elvensis abounds in the English. 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 Jordan, David Star
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