l8 SMITHSONIAN MTSCFXLANEOUS COLLECTIONS VOL. 98 
margin; the second and third teeth are -very much alike in size and 
shape, the third is slightly less stout than the second, both are more 
or less subequal in length of outer margin and both are longer than 
the first ; the fourth tooth is the smallest, perhaps half the size of the 
third, but in no sense rudimentary : fifth not shorter than any of the 
others, but more slender, and so appearing rather long. 
The lateral, as well as the frontal teeth of our species in relative 
size are very similar to the other two species with which it is compared. 
The basal antennal joint is about as long as the orbit is wide. It is 
provided with a high, prominent crest, plainly visible in dorsal view. 
This crest, to all appearances, is fairly smooth and unarmed, but, on 
close inspection with considerable magnification, is seen to be slightly 
roughened or obsolescently nodulated with low, irregularly placed 
swellings of its upper margin, more to one side or the other than 
actually on the margin itself : the crest is neither denticulate nor spined, 
it might be called obscurely granulate, but it is more lumpy than 
granulate ; either side of the crest, lower down, the surface of the 
joint is small tuberculate ; these little, more or less low conical tubercles, 
are larger on the proximal end of the joint than distally. I am of the 
o])inion, although I have seen no specimens of T. alcocki, that the crest 
of its basal antennal joint may be much like that of T. rooscvelti here 
described. This crest in T. gardineri, as it is not contrasted with 
exetastica in Borradaile's remarks, must, by implication, be, as in that 
species, very plainly denticulate, for, as figured, it appears more or 
less saw-toothed. 
Either hand of the nearly subequal chelae has a blunt squamose 
ridge on its inner face ; the inner upper margin is armed with two 
stout spines, of which the posterior, arising behind middle of palm is 
larger, longer, and stronger, the anterior spine is a little behind the 
distal margin of the palm ; on the outer margin of the upper surface 
of the palm is another strong spine about the size of the anterior one 
on the inner margin ; on the outer margin, just behind the distal border 
of the palm, is a blunt, conical tubercle ; there is another strong, stout, 
sharp spine on the palm at the carpal articulation, the fourth of those 
arming the chela ; on the outer surface of the palm is a low, squamose 
ridge running from below this last mentioned spine to the articula- 
tion of the movable finger ; below this ridge are two other better de- 
fined, crenulate ones ; the u])per one is the stronger, with larger crenu- 
lations, anteriorly it bends downward a little, to be continued on to 
the outer side of the fixed finger as a more or less smooth, noncrenu- 
late Carina ; the crenulations of the lower ridge, as it runs on to the 
finger, become progressively smaller until they fade out, so that the 
