188 E. A. AnpREws, 
There is thus formed a thumb and finger which might be functional and 
might serve as the basis for the development of such a claw asthefemale 
has, as represented in Fig. A. On both the thumb and finger of this rudi- 
ment are setae of two kinds, large blunt spines and fine sharp 
bristles.. Moreover these are arranged on the same general plan as 
in the perfect female claw to the extent that the setae form a cur- 
ved series running back from the apex of the thumb or finger and 
that the fine setae are placed internal to the great ones, so that 
if sufficiently multiplied they might make concentric series as in 
Fig. B. The number of setae is very small: on the thumbling there 
are about a dozen large blunt spines and central to this curve 
about as many more very fine spines in a cluster: the trace of & 
finger has about three dozen stout spines in a U shaped series, 
some sixteen in the chief line and external to this two more imper- 
fect rows at the tip of the organ, that is the bottom of the U. Here 
as in the thumb the spines grade off from the largest at the distal 
middle of the series to the smaller at the ends of the curve. 
The little fine setae of the finger are about two dozen and pla- 
ced just within and parallel to the large spines, chiefly along one 
arm of the U. 
A surface view of the thumb would be similar to that in Pari- 
bacus as seen in Figure G@ but without the rim and with more setae 
more definitely placed and with some fine setae added, while a like 
view of the finger would show still more setae developed, as in a 
true finger, yet without the modelling in form of a true finger. In 
seneral this one elaw of Panulirus approaches more to the female 
claw than did any male claw trace seen in Paribacus. 
At the best all these male claw traces are but minute and 
apparently useless objects thought the best developed one, this one 
claw of a Panularis, could evidently be made use of as a forceps if 
the creature moved its muscles properly to that end. 
The male claw is at best a wretched imitation, a mere cari- 
cature of the female claw and is more often absent than present and 
differently developed even on the two sides of the same animal. The 
male claw is but a maimed or distorted image, an anamorphosis. 
The peculiar fifth leg claws of the females in Panulirus and 
Paribacus may be likened to the cleansing apparatus in Cambarus. 
As described and figured elsewhere (2), both the fifth and the fourth 
legs of Cambarus have on the ultimate segment a comb-like set of 
setae and on the corner of the penultimate segment some horny 
