1276 General Notes. [ December, ' 
parts of the limb of a crustacean, the prominently-marked portion 
of these ambulatory limbs is undoubtedly the meropodite, which 
was in some cases two centimeters in length and quite large, with 
the mero-carpopodite articulation well pronounced, so as to-leave 
a distinct, pit-like depression in the matrix. The several joints 
externally to that which is considered the meropodite can be dis- 
tinguished by careful study of the several legs and the grooves 
and foveæ of the matrix. The carpopodite was about the length 
of the meropodite, but decidedly slender as compared with the 
latter. If there was any positive evidence to show that these 
were broad, lamellar appendages, adapted to swimming, then the 
slender joints external to the meropodite might be accounted for 
by supposing the edges were the portions visible. The propodite 
was about two-thirds the length of the carpopodite, and also ap- 
pears to have been slender and slightly curved backward; the , 
dactylopodites are not well preserved, yet sufficiently so to permit 
the conclusion that they were not chelate. The posterior pair of 
these thoracic appendages is directly beneath the posterior somite 
of the thorax. The meropodites of the two anterior pairs of ap- 
pendages, as shown in Fig. 3, resemble the same joints 1m the 2 
thoracic limbs. ; fee = 
In examining the matrix, Fig. 3 d, where the left limb irs 
anterior pair is well preserved, it is seen to curve aroun ol 
outer margin of the left lobe of the hypostoma, and, from the AS 
dence which the surface presented when first examined, I pea 
the opinion that this limb was chelate. In removing the i 
stone so as to expose the left lobe of the hypostoma, and also =. 
tablish the articulation of the claws, an accidental stroke ga pa 
the evidence of this direct connection, yet at the fracture a 
of two broken claws can yet be seen. At first I bee oy 
to regard the distal extremity of this pair as chelate. ened i 
tempting to remove the limestone, the surface clearly sf pr 
conjunction of these parts. This condition could gcse peng 
counted for by supposing one limb to have been SHIOR =i 
another. It was to clear up this-point that the ren 
adhering material was made. If chelate, the claws 
and of about equal size as in Limulus. As th 
quently found in this limestone formation, It 1S to 
these limbs will also be found, so as to definitely “these SUP 
On fitting the two specimens together, the ends of the , 
claws are seen at the fracture directly beneath 
Saga ie ae eee ol 
oe 
developed walking legs, extending near! 
the carapace. The exoskeleton of the limbs seems = 
somewhat different in character from the calcare f suc 
of the dorsal surface of the animal. At least, it was Xe nem 
acter as not to preserve well the integrity of the ftand ] 
cess of fossilization. They could not have been so 
