106 A REVISION OF THE ASTACIDA. 
Carapace punctate on both the back and sides; on the gastric region the 
punctation is very coarse, assuming the form of reticulation; cervical groove 
sinuate; no lateral or branchiostegian spines; anterior lateral margins 
notched behind the antenne; areola broad, heavily punctated. Abdomen 
about the length of the thorax. Telson long, proximal segment bispinose 
on each side. Antenne slender, shorter than the body by the length of the 
telson. Antennal scale of moderate width, terminal spine very long, reach- 
ing beyond the tip of the rostrum. LEpistoma triangular. External max- 
illipeds hairy within and below. Chelipeds short, stout; chele very large, 
broad, non-tuberculate, hand convex above and below, punctate, internal 
margin entire; fingers short, thick, with lines of ciliated dots, Carpus 
punctate above, with one internal inedian spine. Upper border of meros 
with one or two ante-apical spines; the biserial spies below are not devel- 
oped, except the distal one of each row, and even these are minute. Third 
segment of third pair of legs hooked. First pair of abdominal appendages 
reach the base of the second pair of legs. They are deeply bifid, the rami 
recurved ; the outer ramus is aciculate, the inner is enlarged at base and at 
tip, and the tip is furthermore grooved in front and rounded off at the end. 
Male, form I1.— Hand smaller, fingers gaping at base, external finger 
ciliated at base within, hook on third segment of third legs very small; first 
pai of abdominal appendages articulated near the base, thick, inner and 
outer parts separated for only a very small distance from apex, compressed 
from side to side, tips a little recurved, blunt-pointed. 
Female.— Chelee somewhat smaller than in the first form of the male, 
fingers less widely separated at base, external finger ciliated at base within. 
Anterior border of annulus ventralis nearly obliterated in the median line, 
lateral borders raised into prominent tubercles, transverse fossa wide. 
Length of body (male, form I.),45 mm. Leneth of carapace, 22.5 mm. 
Length of areola, 8 mm. Breadth of areola, 2 mm. 
In the largest specimen seen, the dimensions of which are given above, 
the lateral spines of the rostrum are obsolete, the margins simply notched 
at base of the acumen; in the other specimens the lateral rostral spines, 
though small, are evident; the antenne in the larger specimens are shorter 
in proportion to the length of the body. 
Thirty-nine specimens (eighteen males, form I., two males, form II., and 
nineteen females) were collected by C. L. Herrick, for the U. S. National 
Museum, in Second Creek, Waterloo, and in Cypress Creek, Lauderdale Co., 
Ala., October, 1882. 
