104 A REVISION OF THE ASTACIDA. 
species in its linear shorter areola and male appendages, which are more 
stronely curved, and formed more on the pattern of the same parts in 
C. immunis. In the latter species, however, these appendages are still more 
strongly curved, the areola is not linear in any part, the rostrum is more 
deeply excavated, longer, and (usually) toothless, the antennal scale is sub- 
truncate at the end, and the hand different. Its closest relative is C. Missis- 
sippiensis. See description of that species, page 101. 
Some of the specimens still show spots of dark color (purplish) on the 
chelxe, carpus, and branchial regions of the carapace. In a few specimens 
there is a very faint indication of a median carina on the rostrum. 
44, Cambarus Alabamensis. 
Plate IV. fig. 4, Plate X. figs. 3, 3’, 3a, 3a’. 
Cambarus Alabamensis, Faxon, Proc. Amer, Acad. Arts and Sci., XX. 125, 1884. 
Male, form T. — Rostrum broad, punctate, subexcavated above at base, with 
a broad, rounded, slightly elevated median carina near the tip; sides sub- 
parallel, punctate, ciliate; acumen long, triangular, marginal spines slightly 
developed. Anterior spine of post-orbital ridge hardly developed. Carapace 
smooth, punctate, cervical groove sinuate, with minute lateral and branchi- 
ostegal spines; anterior margin notched at base of antenne; areola wide, 
short (less than half as long as the distance from cervical groove to the lat- 
eral rostral spines), thickly punctate. Abdomen longer than the cephalo- 
thorax by the length of the terminal segment of telson. Telson rounded 
behind, basal segment bispinous Epistoma triangular. Antenne nearly as 
long as the body, slender; scale moderately broad, broadest in middle, thence 
tapering to the apical spine. Third maxillipeds hairy within and below. 
Chelipeds of moderate length, strong. Chela broad, thick; hand punctate, 
inner margin of moderate length, scarcely serrate; fingers of moderate 
length, costate, ciliate-punctate, usually meeting only through their distal 
third. Immovable finger heavily bearded at base within, both above and 
below. Carpus smooth, punctate above; on the internal border there is a 
strong median spine ; in front of this, near the articulation, is a minute spine, 
and behind it are one or two faint ones near the base ; below, the carpus has 
a single small spine near the external articular point of the hand. Meros 
smooth, punctate, with two obliquely disposed spines near the anterior end 
of superior border; of the biserial spines beneath, only the distal one or two 
