rae | PROCEEDINGS OF THE NATIONAL MUSEUM. 13 
. 
of the hand and runs diagonally to the end of the pollex; just behind 
the gape of the fingers it is elevated to a horn or tubercle. In all speci- 
mens the anterior outline of the horn is perpendicular to the hand. In 
small specimens the posterior outline is straight from the apex of the 
horn to the beginning of the ridge near the wrist. In large specimens 
the horn is much more elevated than the straight lines of the ridge. An 
auxiliary, spiny ridge, running from the outer middle of the wrist to 
the horn, cuts off an elevated subtriangular area on the posterior part 
of the hand. This area is somewhat spiny. The outer portion of the 
hand is deeply concave and its surface roughened by spiny granules. 
The inner side of the hand is deeply excavated, the cavity running in 
under the ridge and horn. The fingers are thin, granulate, the pre- 
hensile edges set with blunt teeth. 
The left cheliped is much smaller than the right, reaching beyond the 
articulation of the dactyl of the large hand. The merus is compressed 
above, flattened beneath; margin spiny. Carpus compressed, flattened 
above, bicristate. The outer face of the hand is subtriangular, deeply 
concave or excavate; surface granulate; margins spiny. 
The ambulatory legs of the right side reach but little beyond the 
cheliped. Merus joints of first pair much compressed, armed with small 
spines below; carpal joints armed with larger spines above. The sec- 
ond pair are without spines. Dactyls flattened, curved, twisted, chan- 
neled on each side near the articulation of the propodus; inner surface 
with a line of hair near each margin. 
Alaska. 
Eupagurus townsendi. 
Rostriform tooth sharp, produced slightly beyond the base of the eye 
scales. Lateral projections of the front but little produced. Eye pe- 
dunele constricted at the base, dilated at the cornea. Scales small. 
Acicles of antenne slender, extending beyond the eyes for nearly half 
their length. 
The chelipeds are long, the merus joints extending beyond the eyes 
by about one-half their length; spiny below. The carpus of the right 
cheliped is five-eighths as wide as long, its inner margin with a row of 
spines about one-third larger than those scattered about the surface 
and about double the size of the spines of the outer margin. The upper 
and lower surfaces are convex; outer and inner surfaces flat or slightly 
concave. The handis more than twice as long as wide, thinly spinous. 
The spines of the outer margin are about the same size as those of the 
surface, and very much larger than those of the inner margin. There are 
two rows of spiny granules on the dactyl, with a flat surface between. 
The hand is evenly convex above and below. The fingers are slightly 
bent downward. 
The left cheliped reaches the base of the dactyl of the large hand ; it 
is compressed. The carpus has a flat upper surface, with a row of small 
‘spines on each margin. The hand has a subtriangular and slightly 
