CAMBARUS. on 
of Hagen’s Monograph, figs. 93, 94. This is doubtless Le Conte’s species. 
It is peculiar in having tufts of long hair-like setee on the inner margin of 
the hand. The only other species known to have these hair-like growths 
is Astacus Gambeli, from the Western United States, which has the pilosity 
on the outer as well as the inner margin of the hand. 
Length, 42 mm. Carapace,21 mm. Abdomen, 22 mm. From tip of ros- 
trum to cervical groove, 14 mm. Cardiac region, 7 mm. Width of areola, 
1mm. Leneth of chela, 14 mm.; breadth of do., 5 mm. 
Of the other specimens referred to C. penicillatus, two young females from 
Charleston, 8. C. (Cat. No. 254) are surely C. troglodytes. Two other females 
and two males, form II., also from Charleston (Cat. No. 250), may be the 
female and second form of the male of C. penicillatus, as claimed by Hagen, 
but I suspect that they belong to another species. The form of the first pair 
of abdominal appendages of the male (Hagen, PI. I. figs. 95, 96) is not what 
one would expect in the second form of C. penieilatus. The antennal scale 
is narrower, longer, diminishing more rapidly in width beyond the middle. 
The lack of beard on the hands, a more gradually tapering rostrum with 
longer acumen, and the trispinous basal segment of the telson also serve 
to distinguish these specimens from the first form male from Georgia. 
In the collection of Butler University, Irvington, Ind., is a male, form 
II., collected in Eastern Mississippi by O. P. Hay, which closely resembles 
the specimen of C. penicillatus from Georgia, excepting in the following par- 
ticulars. The base of the rostrum is more clearly foveolate. The areola is 
only one half the width of that of C. penicillatus, being reduced to such an 
extent as to admit but one line of impressed dots within its area, while in 
the Georgian specimen there are two or three parallel longitudinal rows 
in the narrowest part of the areola. The fore border of the carapace is 
not angulated behind the antennx, as in the specimens from Georgia and 
Charleston. The sete that grow from the squamous tubercles on the inner 
edge of the hand are longer than on the other parts, but are not drawn 
out into pencils, as in the first form from Georgia. 
The first pair of abdominal appendages are articulated at the base, re- 
curved at their distal end, though not so strongly as in the first form from 
Georgia; internal part with a short apical tooth directed obliquely outwards, 
external part with two stout apical teeth. The short apical tooth of the 
internal part of the appendage gives it a very different appearance from the 
second form males from Charleston, described above, and referred to C. peni- 
