THALESTRIS. 137 
rather strongly clawed, the lateral processes of the palp 
broad and stout. Anterior foot-jaw (fig. 7) strong and 
numerously segmented ; posterior (fig. 8) having a 
remarkably large and powerful hand, broad at the 
base, with a serrated or file-like, deeply-concave, 
inner margin, and shaped much like that of Harpac- 
ticus chelifer, with a strongly produced angle at the 
proximal end of the concavity; terminal claw more 
than half the length of the hand, much curved, 
stout, and armed with two small accessory spines 
near the base. TFirst pair of feet (fig. 9) very long 
and slender, subequal, each branch with only one 
long terminal claw and one short seta; outer branch 
bent on the peduncle in a knee-like angle; margins 
only very slightly ciliated; the second, third, and 
fourth pairs of feet are successively much shorter ; 
fifth pair, in the female very large, at least as long as 
the first two abdominal segments; the outer branch 
elongated, subquadrate (fig. 11), bearing five setz on 
the distal margin, which is also finely ciliated; inner 
branch narrower, subovate, margins ciliated and having 
four setz.on the outer margin and apex. Last ab- 
dominal segment very short, tail-segments rather 
longer ; outer. tail-seta very short and slender, inner 
thrice as long, strong, and much dilated at the base. 
Length {sth of an inch (1:4 mm.). 
A very fine species and one of frequent occurrence, 
varying much in colour, from a uniform deep brown 
or red, to a golden yellow with red bands and blotches ; 
otherwise very constant in character. It occurs most 
frequently in the laminarian and littoral zones amongst 
