MEXICAN, CENTRAL AMERICAN, AND CUBAN CAMBARI 5 
irregular, strong tubercles; tips horny, and generally another 
horny tooth a short distance from tip on cutting edge of the im- 
movable finger. 
Carpopodite short, with a longitudinal sulcus above, granu- 
lated and tuberculated ; tubercles forming one or two spines on 
distal end of inner margin, and two other spines on lower sur- 
face, one on anterior margin, the other at the lower articulation 
with the hand. Meropodite granulated, but almost smooth on 
the larger portion of outer and inner face; several strong tuber- 
cles at distal end of upper margin; inner and outer lower 
margins each with a row of strong, spiniform tubercles, the 
outer row shorter. All the tubercles of the chelipeds appear 
squamiform on account of a fringe of short, stiff hairs at their 
anterior edges. 
Ischiopodite of fourth pereiopods with a strong hook; this 
hook has a subcompressed, broad base, and is subcompressed, 
but narrower at the tip, and is slightly twisted. The ischiopo- 
dite of the third pereiopods is without hook, and there is only 
a slight, almost imperceptible elevation at its inferior margin. 
a b 
Fic. 1. Cambarus paradoxus, sp. n. First pleopod (right side) of male (I). 
a, outer view; J, inner view. Enlarged about four times. 
First pleopods (see Fig. 1) reaching to the middle of the bases 
of the third pereiopods, stout, slightly curved backward; inner 
and outer parts subequal, in close apposition to the tips. Both 
tips curved gently backward, and slightly outward, horny; 
inner part, on posterior margin, at a short distance from the tip, 
with a strong, spiniform process, going off at an acute angle, 
and being longer than the two tips of this organ. 
Male of the second form: Tips of inner and outer parts of 
