. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 76 Mr. R. Walker on Fossil Fishes of Dura Den. in the Museum of Practical Geology/' &c. He further states, " The clear recognition of the fact that this elegant structure really characterizes Glyptolepis is of great importance, for it en- ables one to discriminate between Holoptychius (whose scales have no semilunar area of backwardly-directed points) and Gly- ; As we have just seen, the scales of H. Flerningii, Agass., have the identical structure of th
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 76 Mr. R. Walker on Fossil Fishes of Dura Den. in the Museum of Practical Geology/' &c. He further states, " The clear recognition of the fact that this elegant structure really characterizes Glyptolepis is of great importance, for it en- ables one to discriminate between Holoptychius (whose scales have no semilunar area of backwardly-directed points) and Gly- ; As we have just seen, the scales of H. Flerningii, Agass., have the identical structure of the scales of undoubted specimens of Glyptolepis, so far, at least, as the crescent of points is con- cerned, which seems to be the only tangible difference between them generically {Holoptychius and Glyptolepis). Such being the case, we are warranted in pronouncing H. Flerningii to be a true Glyptolepis. The head of H. (G.) Flerningii is in length to that of the body as 1 to 4 or 5, and is of a depressed roundish form, gradually tapering towards the snout, which is blunt and round. The head is covered with granulated plates of no great thickness; on the sides of the head they join each other by squamous su- tures, extending inward and upward. In this way these bones slightly overlap at the margins, without projecting externally. When their granulated surfaces happen to be uninjured, it is not always easy to determine where one bone ends and another begins. The occipital region is covered over by a median and two lateral bones; the median, or supra-occipital (), is trun- cated in front and rounded behind, where it partly overlaps the. Side view of the head of H. Flerningii. scales of the nape. The lateral or epiotic (ep.) extend back- wards and downwards till they meet the operculum, their upper. 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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