. The Canadian naturalist and geologist. Natural history -- Periodicals. Point Levi Fossils, 309 The pleurae which seem to belong to this species are broad, flat, falcate and with a moderately strong groove running obliquely nearly their whole length. Judging from the form of the three pygidia figured by Angelin on Plate 41 of the Palaeontologia Scandinavica, it appears pro- bable that this species connects Dikelocephalus with Centropleura a genus which occurs in the base of the Lower Silurian of Swed- en, in Regio B and C of Angelin. It is perhaps an extreme form but the course of the facial
. The Canadian naturalist and geologist. Natural history -- Periodicals. Point Levi Fossils, 309 The pleurae which seem to belong to this species are broad, flat, falcate and with a moderately strong groove running obliquely nearly their whole length. Judging from the form of the three pygidia figured by Angelin on Plate 41 of the Palaeontologia Scandinavica, it appears pro- bable that this species connects Dikelocephalus with Centropleura a genus which occurs in the base of the Lower Silurian of Swed- en, in Regio B and C of Angelin. It is perhaps an extreme form but the course of the facial suture and characters of the glabella are the same as they are in Dikelocephalus, The py- gidium differs from D. Minnesotensis in having fewer ribs and a greater number of spines, but this difference is not of itself I think of generic value. Limestone, No. 1. Dikelocephalus planifrons. N . s. Fig. 6. Description,—Head with a broad smooth margin in front, the width of which is about equal to the width of the glabella: the latter oblong conical rather flat most elevated along the median line, broadly rounded in front, its sides nearly straight and sub parallel slightly converging from behind forwards. On each side of the median line there are three or four obscure depressions. 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 Natural History Society of Montreal. Montreal, Dawson
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