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 both organs agree with those which he has figured from the recent Buthus. We have been unable to notice in the place where Fritsch figures the triangular sternum anything but a faint, irregular discoloration, such as is seen in many places on the slab. This appears too dark in the photograph and is therefore misleading. The opercular plates are more irregular in outline than would appear in the photograph, but the fact that they overlie the legs (hence lay inside of the same in the specimen), and their relative position to the comb which lies nearby, suggest the possibility of their representing the opercular plates.

The hand or chela in the specimen probably does not belong to the left pedipalp, as inferred by Whitfield, for from the crushed character of the "palm" of this hand we infer that it was the strongly bulging inner side, turned upward, and hence is the right chela thrown over on the left side. This inference is supported by the two strong joints which extend from the chela toward the posterior part of the carapace and are too broad and strong to have been joints of walking legs, as represented by Whitfield. The left chela and tibia are probably folded under the body.

The pedipalp of this scorpion was clearly a powerful organ and exactly corresponded in relative size to the pedipalp of recent species.

Of the walking legs but one projects beyond the confused mass of limbs. This has been the subject of much controversy. Both Whitfield and Scudder believed a double claw to be observed at the supposed terminal joint of this leg. Since the other Siluric scorpions, the species of Palaeophonus, are distinguished from all later scorpions by a single, spinelike claw, they rightly saw in this feature an important character connecting Proscorpius with the Carbonic and recent scorpions. For this reason Scudder created the subfamily Proscorpionini, which he placed under the family Eoscorpioidae, the Palaeophonoidae forming the other family of the older Anthracoscorpii. Thorell soon after pointed out that a close inspection of the figures gives the impression that the leg in question is incomplete, "being broken near the base of one—probably the last—of