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THE HABITAT OF THE EURYPTERIDA
 Fig. 12. Sketch Map Giving Outcrops of the Wenlock of the Pentland Hills, Scotland |
pared with that made by Laurie at the time when he described the eurypterid fauna from these beds. He says: "The rock in which the Eurypterids are preserved is an irregularly fissile fine-grained sandstone, containing a considerable amount of carbonaceous matter dis-
