THE BKACHYURA AND MACRURA OK PORTO RICO. 
Ill 
Genus JOUSSEAUMEA Coutiere. 
Jowweamea Coutiere, Bull. Mus. Hist. Nat. Paris, n, 1896, 381. 
Carapace depressed, more < >r less carinated; rostrum broad and flat. Eves wholly or almost wholly 
concealed beneath carapace. First pair of feet asymmetrical; large cheliped with merus elongate; 
carpus short, cup-shaped; propodus with three or four surfaces; lingers saw-toothed. 
Jousseaumea trigona, sp. nov. 
I have placed this species (which is represented by a single specimen in bad condition) pro- 
visionally in Jousseanmea, although the chelipeds are not folded under the body and the propodus 
is three-sided. 
Carapace of female with nine sharp longitudinal crests. The median extends from tip of rostrum 
to near posterior margin of carapace. The next crest 
extends from margin of orbital hoods about two-thirds 
the length of carapace; on the posterior third this 
crest is replaced by a curved crest, which anteriorly 
turns downward and outward, and then backward, 
forming a portion of an oval. The third crest begins 
on a line with lower margin of eye, and a little behind 
eye, and extends backward and slightly downward to 
posterior third of carapace; it there forms an obtuse 
angle and curves slightly upward and backward to 
near posterior margin. Fourth crest short, arising 
behind third, and extending barely half-way back on 
carapace. Fifth crest very short, extending obliquely 
d >wnward from tip of antennal spine. The rostrum 
viewed from above is triangular, acute, the tip reach- 
ing slightly beyond first segment of antennula; ante- 
rior margin of carapace sloping obliquely backward in 
a sinuous line to lateral angle. Eyes large and entirely 
covered by carapace. Antennular peduncle short, the 
second segment a little longer than third. Its scale 
is as broad at base as peduncle and overreaches a little 
the penult segment of peduncle. Antennal peduncle a 
little longer than antennular. Its scale very broad, 
with almost straight outer margin and not quite so long as antennular peduncle; the distal spine 
scarcely overreaches the blade. 
The outer maxilliped reaches nearly to end of antennal peduncle; it is flattened, with sharp, 
lateral edges; terminal joint acuminate. The large cheliped extends beyond antennal peduncle by 
only about two-thirds the length of fingers. Merus triangulate, increasing in size dista'ly ; a sharp, 
longitudinal, and somewhat curved crest on its inner inferior margin. Carpus very short, with a sharp 
outer tooth. Palm triangulate, with a flat superior surface, a convex infero-outer face, and a narrower 
flat infero-inner face; three surfaces separated by sharp crests, of which the outer one has a curved 
tooth at proximal end. Fingers about as long as palm, subcylindrieal, the movable or outer larger 
than immovable or inner; fingers terminating in short, slender horny tips crossing each other. 
Prehensile edges subentire and ciliate. Smaller cheliped missing. The palm of second pair of feet 
overreaches slightly the antennal peduncle. The first segment of carpus is equal to second, third, and 
fourth taken together. These three are subequal. The fifth is 1.5 times the fourth. Palm as long 
as fifth carpal segment; fingers a little longer than palm. The third pair of feet reach to distal third 
of lingers of the large cheliped. They are slender. Carpus about half the length of the merus and 
two-thirds the propodus. Dactylus half as long as the propodus. Propodus with a few spinules 
on lower margin. 
Length of female from tip of rostrum to tip of telson, 13.2 mm.; length of carapace, 5.5 mm. 
Type locality, off Vieques, 6 fathoms, coral, station 6096, 1 female (Cat. No. 23785). 
carapace and antennee, x 6. ( b ) Dorsal view of car- 
apace and antennre, x 7.5. (c) Lower view of left 
cheliped, x 10. 
