Geological magazine . ayer. The upper, orwhat has hitherto been considered the outer, layer is black in colour,and made up chiefly of parallel lines, almost exactly like those ofthe corrugated sheet iron roofs now in common use. Fig. 3 willgive an idea of a small portion of this coat from a specimen fromPolperro. In the specimen under consideration from the Eifel (Plate 4 and 5) there appear to be some peculiarities. In the firstplace, the nacreous layer seems to be absent, and though, as has beenobserved by a leading paleontologist, this may be accounted for bysupposing that it has
Geological magazine . ayer. The upper, orwhat has hitherto been considered the outer, layer is black in colour,and made up chiefly of parallel lines, almost exactly like those ofthe corrugated sheet iron roofs now in common use. Fig. 3 willgive an idea of a small portion of this coat from a specimen fromPolperro. In the specimen under consideration from the Eifel (Plate 4 and 5) there appear to be some peculiarities. In the firstplace, the nacreous layer seems to be absent, and though, as has beenobserved by a leading paleontologist, this may be accounted for bysupposing that it has perished, there is still a greater peculiaritywhich can hardly be explained in this manner; for apparently theblack corrugated portion is not on the outside, but (at least in oneinstance) lies between two of the honeycomb layers. Fig. 6 is aside-view, and Fig. 7 is a much magnified view of what appears toshow that in this Eifel scale there are two if not three honey- GEOL. MAG. 18 82, DECADE ;. PLATE III. 10 I.
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