CRUSTACEA. 
145 
Palemon testa polita, lateribus profunde punctatis, rostro 
squamis antennarum breviore, antrorsum descendente, 
12-vel 13 spinoso ; pedum pare secundo longissimo, spinoso, 
cylindrico. 
Rostrum longer than the peduncle of the external 
antennae, hut not so long as their basal scales, some- 
what descending anteriorly, and armed with twelve 
or thirteen teeth above, and three beneath ; thorax 
smooth, except on the sides where it is almost re- 
ticulate with profound punctures; a strong spine 
on each side anteriorly, and a smaller one behind 
it ; second pair of feet longer than the body, inclu- 
sive of the rostrum and caudal appendages, and 
covered in their whole extent with strong spines, 
those on the under side being largest, many of them 
nearly one-eighth of an inch in length; carpus 
scarcely three-fifths of the length of the palmar 
portion of the hand ; pincers at least as long as the 
hand, very spinous, white at tip, where they are 
strongly crooked, the moveable one is armed with 
two or three small teeth, and the immovable with 
one ; the two unite in their whole length, being 
formed much as in the P. carcinus, but in the spe- 
cimen belonging to the Academy, which has only 
the foot of the right side remaining, they accident- 
ally diverge; the carina, however, together with 
the groove which should receive it, are somewhat 
distinct ; the remaining feet are all covered more 
or less with short spines. 
Length eight inches, but perhaps becomes larger 
with age. 
VOL- vui. — 1S30. 
19 
