. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 100 NOTES AND ADDENDA. of the sides rhombic, coarsely toothed on the posterior edges, and elabor- ately sculptured with flat, scaly ridges, corresponding to the teeth of the edge. The ridges are arranged in an upper and lower series, the latter oblique to the former, so that each scale has the appearance of being com- posed of two distinct portions. Lower
. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 100 NOTES AND ADDENDA. of the sides rhombic, coarsely toothed on the posterior edges, and elabor- ately sculptured with flat, scaly ridges, corresponding to the teeth of the edge. The ridges are arranged in an upper and lower series, the latter oblique to the former, so that each scale has the appearance of being com- posed of two distinct portions. Lower surface of scales smooth, with a few furrows corresponding to the ridges above, and the posterior edges apparently serrate. Caudal scales narrowly rhombic, pointed, and with a few central lines. Tiie back is protected witli about ten large oval scales between the head and the dorsal. They are sculptured with waving lines, curving with the edges, and are apparently truncate and serrate behind. Tlie fish figured by Jackson, PI. II., Fig. 5, but not named, probably belongs to the above species. Fi};. IS.—Palaoniscus modvhm, ,. (n) Outline, natural size. (6) Scvies of Sciiles enlarged, seen from inside. The lower rcw are tliose on mesial line. ((•) Surface of exposed part of scale from side and from upper lobe of tail, showing sculpture, enlarged. ((/) One of the dorsal scales, enlarged. This beautiful and elaborately ornamented little fish is a perfect model in miniature of that type of lower Carboniferous Palseoniscids to which it belongs, and whicli has recently been separated by Dr Traquair in the genus or subgenus Rhadinichthys. For this reason I have given it the specific name modulus. To the same genus belong the two next species, described by Jackson, of which I shall give merely distinctive marks. P. Alberti, Jackson, is larger than the preceding. The scales have more numerous striaj. The dorsal scales are rounded posteriorly. The posterior edge of the anal f
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
