EUPAGUEXTS . 507 



The Second and Third Pereiopods (fig. 11) are alike. 

 They are similar in essential structure to the Chela, but 

 they are not chelate and the dactylos is long, curved and 

 grooved. It is characteristic of the present species that 

 this joint is contorted. 



The Fourth Pereiopod (fig. 12) is remarkable for the 

 possession of a moveable dactylos, which forms a sort of 

 sub-chelate termination to the limb. File-like surfaces 

 of corneous granules are present on the propos and 

 dactylos. The last three segments are bent at right 

 angles to the rest of the limb in this and the following 

 appendage. 



The Fifth Pereiopod (fig. 13) is similar to the 

 previous limb, except in its termination. The last joint 

 is flattened and provided with a stiff brush of setae and a 

 surface of corneous granules. The crab continually 

 passes this leg inside the branchial cavity with a 

 scrubbing motion. 



The PleopodS (figs. 14 and 15) are essentially the same 

 in structure in both sexes, consisting of a protopodite 

 bearing two rami. They are present in the male on the 

 left side only of the third, fourth and fifth segments, and 

 in the female on the second segment as well. All the 

 male and the fifth female appendages are slender and the 

 internal rami are minute. The other female pleopods 

 (the ovigerous legs) are comparatively massive, and the 

 branches are sub-equal and bear long setae. 



Uropods (fig. 16). — The uropods are the only paired 

 abdominal appendages in the adult, and they are the 

 same in both sexes. The external ramus of the left one 

 is large and sickle-shaped, and the whole appendage is 

 much larger than the right one. 



Autotomy takes place as readily as in Crabs, and in 

 the same manner. (See " Cancer," p. 56.) 



