102 A REVISION OF THE ASTACID. 
a punctate impressed line parallel with immer margin, and furnished with 
rounded tubercles on inner margin. Movable finger tuberculate on outer 
margin. Outer finger bearded below at base. Carpus broad, obliquely trun- 
cate on the external side, punctate and tuberculate above, a strong median 
internal spine, two small spines near on the base and one at the anterior 
end near the articulation ; multispmous beneath, the two anterior spies the 
largest. Meros smooth, two ante-apical spines obliquely placed on upper 
margin, lower face with blunt biserial spines. Second pair of legs with long 
setz near the end on inner side, not tufted as in C. mununis. Third pair of 
legs hooked. First pair of abdominal appendages long, deeply bifid, rami 
recurved at tip, parallel, internal ramus subcylindrical, dilated and grooved 
at tip, external ramus a little longer than the internal, laterally flattened, 
ending in a slender, sharp point. 
Male, form II. — Rostrum with small lateral teeth ; hand smaller, with 
smaller tubercles ; hooks on third legs smaller; third pair of abdominal 
appendages stouter, cleft for only a short distance from the tip, tips blunt, 
no articulation at the base in the one specimen examined. 
Female. — Rostrum as in the second form of the male. Hand shorter 
and broader, annulus ventralis with a very deeply excavated fossa. 
Measurements of male, form I.— Length, 73 mm. Length of rostrum, 
9mm. Breadth of rostrum at base, 5mm. Length of areola, 11mm. From 
tip of rostrum to cervical groove, 25mm. Length of chela, 35mm. Breadth 
of chela, 14mm. Length of inner finger, 24mm. Length of internal margin 
of hand, 11 mm. 
Five specimens, one male, form I., one male, form II., and three females, 
were collected by Prof. O. P. Hay in Eastern Mississippi. Two of them are 
labelled “ Macon, Miss.” 
Differs from C. émmunis in its linear areola, flatter rostrum, differently 
shaped chela, and male appendages, the rami of which are longer and less! 
strongly recurved. C. Padmeri differs from it in its quadrangular rostrum, 
which has a longer acumen and more prominent lateral spmes, narrower 
and long-spined antennal scale, and longer areola; the rami of the male- 
appendages (form IL.) are a little longer and more widely separated. 
C. Alabamensis differs by its wide areola, toothed and carinated rostrum, 
etc. ; C. compressus, by its laterally compressed carapace, wide areola, nar- 
row carinated rostrum, ete. 
