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. First 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 setae on 

 the distal margin, which is also finely ciliated ; inner 

 branch narrower, subovate, margins ciliated and having 

 four setse 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 -rg-th 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 laminariau and littoral zones amongst 



