856 CRUSTACEA. 



elliptical, finger minute and articulated with the hand by the 

 dorsal margin, lying longitudinally, and hardly reaching to apex. 

 In other characters like the male. 



Plate 57, figs. 1 a to m, male; n to r, female : fig. 1 a, male, enlarged; 

 b, mandible of same; c, maxilla of first pair; d, ibid, of second pair; 

 e, maxilliped ; /, leg of first pair ; g. hand of second pair ; h, leg of 

 fifth pair ; i, side view of head ; h, front view ibid. ; I, under view ; 

 m, view of lower part of same from behind. — n, female, enlarged ; o, 

 extremity of leg of sixth pair; _p, ibid, of seventh pair;^/, same, more 

 enlarged ; q, extremity of second pair ; r, ibid, of first pair. 



Very abundant along the beaches near Valparaiso, burrowing in 

 the sand. The females were also common under sea-weed thrown up 

 by the tides. 



Length, nine or ten lines. Colour, yellowish-white ; base of infe- 

 rior antennse, orange. The males and females are very unlike in the 

 markings of the segments and epimerals, the sculpturing of the male 

 being represented in the female by merely a few faint sulcations, form- 

 ing areolets, which are confined mainly to the epimerals and coxae of 

 the six posterior legs. Still they appear from the similarity of the 

 setules of the legs, the stylets, the relative sizes of the legs, and other 

 characters, to pertain to the same species. Moreover, they were found 

 in the same sand beach very abundantly — the sculptured individuals 

 all having large hands to the second pair of legs ; the areolated all 

 with rudimentary hands, like females. 



Males. — Eye subrotund. The inferior antennas vary much in 

 length, from variations in the flagellum ; in general, they are con- 

 siderably longer than half the body. The flagellum of the superior 

 antennas contains about six or seven joints. In the first pair of legs, 

 the fourth and fifth joints are subcylindrical, and the claw is about 

 half as long as the fifth. The palm of the second hand is spinulous 

 below the emargination, besides having a few minute spines above it. 

 The claw of the third pair of legs is slender ; and that of the fourth 

 has a projecting angle below like a tooth ; all the claws are without a 

 Beta below towards apex. The molar prominence of the mandible 

 has a spinulous surface. The animal is rather sluggish in its motions. 



