Catalogue of the fossil fishes in the British Museum (Natural History) .. . Sandstone: Dura Den, Devonian : Chevremont and Strud, Belgium. 26117 b. Skull, mandible, and portion of the branchiostegal ap-paratus, ascribed to Glyptopomus by Huxley, loc. cit.;Dura Den. The woodcut, exhibiting the upper aspectone-half the natural size, is reproduced in the accompany-ing fig. 49. Posteriorly is a broken median element 328 CROSSOPTERYGII. flanked on either side by a large bone, this series beingsivpratemporal according to Traquairs nomenclature(p. 319). A pair of large parietals occur
Catalogue of the fossil fishes in the British Museum (Natural History) .. . Sandstone: Dura Den, Devonian : Chevremont and Strud, Belgium. 26117 b. Skull, mandible, and portion of the branchiostegal ap-paratus, ascribed to Glyptopomus by Huxley, loc. cit.;Dura Den. The woodcut, exhibiting the upper aspectone-half the natural size, is reproduced in the accompany-ing fig. 49. Posteriorly is a broken median element 328 CROSSOPTERYGII. flanked on either side by a large bone, this series beingsivpratemporal according to Traquairs nomenclature(p. 319). A pair of large parietals occurs, with a smallsquamosal on each side adjoining its hinder half; andthe frontals are relatively small, separated by suture, andmeeting some polygonal bones in front, but exhibiting nomesial foramen. The bones apparently to be regarded aspostfrontals are larger than the frontals and squamosals,and are separated from the latter by the articulation of alarge cheek-plate with the parietals. On the lower aspectthe right mandibular ramus exhibits infradentary bones ; Fig. Holoptychius jiemingi, Ag.—Dorsal aspect of head, one-half nat. size.[No. 261176.] a slender median, internal bone seems to belong to thehyoid apparatus; and, in addition to portions of theprincipal jugular plates, a lateral series of jugulars is wellpreserved on half of the right side. Purchased, 1851. 37301. Imperfect head and greater portion of trunk of an equallylarge fish; Dura Den. Purchased, 1863. HOLOPTYCHIID^. 329 26120 a. Portion of trunk of a somewhat smaller fish, displayingthe scales of the ventral aspect; Dura Den. Four ofthese scales are shown, of the natural size, in PI. 1 a-d, the first two being taken from the abdominalregion, the third and fourth from the caudal region. Thetwo latter, it will be observed, are more delicate than theformer, and exhibit the anterior radiating rows of tuberclesusually regarded as characteristic of Glyptolepis. Purchased, 1851. 26120 b. Slab with remain
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