Page:Pocock, The Scottish Silurian Scorpion.pdf/9

upon the accuracy of the attempted restoration of these structures.

Fig. 2.-a. Fourth leg of Limulus moluccanus. b. Fourth leg of a recent scorpion (Buthus australis). c. Third leg of Silurian scorpion, Palæophonus nuncius, after Thorell.
1—7. Segments. s. Suture between fourth and fifth segments of the leg in Limulus. sp. Spurs and lobate sclerites. ?sp. Processes possibly representing the point of attachment of spurs in Palæophonus. cl. Claws in the scorpion, and pair of sclerites forming a nipper in Limulus.

In existing scorpions the basal segments (coxæ) of the legs of the first and second pairs are furnished with a for-