196 gamma rim. 



spine successively increasing in length to the distal ex- 

 tremity of the joint ; the flagellum consists of but a 

 single articulus tipped with two long hairs. The first 

 pair of legs are smaller than the second ; the wrist is 

 longer than the hand, and is inferiorly produced ante- 

 riorly, but not to any very great extent ; the hand is 

 narrow, but slightly increasing in diameter anteriorly ; 

 the palm is not defined, and the finger is long and 

 curved. The second pair of legs are larger than the 

 first, but differ not in any very great extent of form ; 

 the wrist has the inferior margin more decidedly convex, 

 and is fringed with two rows of hairs equidistantly apart ; 

 in one row the cilia are directed anteriorly, and in the 

 other they are directed posteriorly, and the distal margin 

 is excavated ; the hand increases in breadth anteriorly ; 

 the palm is slightly concave, but its limit is imperfectly 

 defined, the inferior angle being rounded off, and fur- 

 nished with a fasciculus of hairs. The third and fourth 

 pairs of legs resemble each other ; they are chiefly pe- 

 culiar for having the wrist and the hand posteriorly 

 furnished with strong blunt spines ; those that are placed 

 nearest to the distal extremity are the longest in each 

 joint, and are nearly as long and powerful as the finger. 

 The hand appears to have the power of being able to be 

 pressed back against the wrist, and the pressure of the 

 spines between each other gives the organ an imperfect 

 but strong prehensile power. In the fifth pair of legs 

 the dilated thigh is of a square form, rather broader 

 than long, and the posterior margin being crenulated, 

 and fringed with a row of simple hairs. The rest of 

 the leg is remarkable for long plumose cilia, which 

 ornament the posterior margin, while the anterior is 

 furnished with fasciculi of short strong spines ; the 

 finger is not curved, but has the anterior margin a 



