112 



grooved; thumb slightly deflexed on the palm ; apices of fingers pointed, 

 beaked, and overriding when closed; cutting-edges strong! 3^ toothed; five 

 prominent, conical teeth on each edge; sometimes two smaller ones be- 

 tween second and third, and third and fourth ; carpus carinated above ; 

 two ridges on the external surface; an obtuse spine projecting from the 

 anterior part of the inner surface ; the ridges on the carpus sinuous ; 

 arm smooth, and not projecting beyond the lateral border of the cara- 

 pace. 



The posterior legs compressed ; contracted at the articulation of the 

 third and fourth articles ; the fifth article and all the tarsi, except those 

 of the last pair of legs, furrowed on their anterior,and posterior surfaces ; 

 on the anterior surface of the tarsi the two furrows, the one above and the 

 other below, separated by a prominent ridge, become continuous at the 

 proximal extremity around the base of the ridge; the fifth joint and 

 tarsus of the last pair compressed to a greater degree than the corre- 

 sponding joints of the preceding legs ; tarsus very much flattened, not 

 grooved, oblong-ovate ; apex corneous, hooked ; a few short and fine 

 hairs on the lower border of the tarsi ; at the base of the tarsus of the 

 last pair, and at the distal extremity of the fifth joint below, is a tuft of 

 hairs. 



Abdomen of female broadly ovate, and composed of seven pieces. 



Color : The whole upper surface of the carapace purple, with the fol- 

 lowing exceptions : a narrow line of white around the entire free mar- 

 gin of the carapace, following the incisions between the lobes on the 

 antero-lateral border ; a round spot of the same color at the anterior 

 superior angle of the orbit, and a short oblong spot, commencing at the 

 apex of the front, extending its whole length; a round spot on the 

 apex of the projecting lateral tooth, and another, similar, on the carapace 

 just anterior to the termination of the lateral ridge. The arrangement 

 of the colors on the legs is somewhat peculiar. Ground color purple ; the 

 distal extremities of the third and fifth joints, and the proximal end of 

 the fourth, white. The purple color extends over the whole hand, except 

 at the base of the movable finger, and on the palm opposite the articula- 

 tion of the finger ; the carinse white ; a ring of purple around the carpus ; 

 the proximal extremity white, and a spot of the same color on the distal 

 end above ; the upper surface of the arm purple. 



Length, 0.45 inch; breadth, 0.56 inch ; ratio of length to breadth, 1: 1.2 



Locality: Palmyra Island, North Pacific. Taken from the cloacal 

 dilatation of the alimentary tract of a holothurian. This is the first in- 



