THE EURYPTERIDA OF NEW YORK 393 
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 photo- 
graph 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 in- 
ner 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 rep- 
resented 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 ter- 
minal joint of this leg. Since the other Siluric scorpions, the species of 
Palaeophonus, are distinguished from all later scorpions by a single, spine- 
like claw, they rightly saw in this feature an important character con- 
necting 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 
