— 
NEW SPECIES OF FOSSIL SCORPIONS. 403 
like hairs. The biting portions long, and hooked at the extremities, the biting 
edge being supplied with regular, very fine saw-like teeth, set with the points 
directed inwards. At intervals a larger tooth interrupts the evenness of the 
line. Walking limbs four on each side, portions of all of which have been pre- 
served (figs. 3 and 3a). The coxe of the six hindermost are triangular in shape, 
the posterior ones being the longest. They converge upon four small plates, 
which enclose a small lozenge-shaped space or plate, where their angles inter- 
sect, the coxee along with these latter forming an efficient sternum. The first 
movable joints are small and triangular, the next are long and somewhat 
flattened laterally, having their under edge marked with a row of tubercles which 
make this portion easily recognised in the fossil state. Only the extremity of 
one walking limb is preserved, and as that is crushed on to one of the palpi, 
it does not show its structure well, though it can be seen to be supplied with 
movable claws. 
Abdomen.—The only portion of this preserved exhibits the ventral side of 
part of the first four segments. The interior of portion of two dorsal plates is 
seen, the posterior margin of one being supplied with a row of tubercles which 
appear on the inside as pits. The genital orifice is situated in the middle line 
just beneath the small plates of the sternum. It is covered by a small valve- 
like plate in shape like a half disc, which is hinged on the straight side to allow 
it to open upwards. In the specimen from which fig. 3 was taken the oper- 
culum is open. On its inner side a narrow raised line, which divides it 
mesially, fits into a corresponding groove when it is shut. Both on the lid 
and the portion covered by it, the skin is puckered up and “drawn” into 
the orifice, which appears as a transverse slit almost as wide as the hinge 
of the valve. Placed on each side of the orifice and slightly beneath it 
two mounds rise to which the bases of the combs are articulated. These 
organs are, roughly speaking, in the form of two right angle triangles with 
the most acute angles directed outwards and articulated by their right 
angles, the remaining angles meeting in the middle line. The hypothenuse 
is occupied by the leaflets or “teeth” of the comb, which appear to the naked 
eye like a fringe a line in depth. When magnified, the triangular rachis is seen 
to be ornamented with a similar embossed scale-like pattern to that on the pre- 
ceding species, while the fringe resolves itself into a row of very numerous over- 
lapping leaflets, narrow at the bases, with parallel sides, and suddenly cut off to 
a point, reminding one of the blade of an ancient Greek sword. Towards the 
inner part of the row, the fringe is single, but near the tips, there is the appear- 
ance of a double row of leaflets which overlap in an imbricating manner like 
tiles. 
Observations.—This must have been a large species, for if the other parts 
wanting be in proportion to those we have preserved it ought to bear favourable 
