248 RANKIN. 



length of 1 8 mm., of smallest specimen 8 mm. The large chela 

 has a somewhat quadrangular depression on the outer surface, 

 the distal end of which is continued upwards into a well-marked 

 depression on the dorsal margin and extends backward as a 

 groove along the inside of the dorsal surface. A distinct, but 

 less marked depression on the ventral margin. Inner surface 

 of the hand slightly hairy, outer surface nearly smooth. Fingers 

 contorted, color in alcoholic material pale blue. Movable finger 

 slightly longer than thumb. In the small chelapod, which may 

 be on the right or left side, the finger is one-third the length of 

 palm. Carpus of chelapods short. Meros triangular in section ; 

 ends distally in a sharp spine on the outer and inner angle. 

 Distal end of meros reaches to end of peduncle of outer an- 

 tennae. 



Second pair of pereiopods very long. Distal end of meros 

 reaches beyond antennal peduncle. First and second joints 

 of carpus sub-equal, each a little longer than third and 

 fourth together. Third and fourth sub-equal. Fifth about 

 two-thirds length of first ; equal in length to fourth and fifth 

 together. Finger about one-half length of thumb. (Fifth 

 joint a little too short in figure.) 



Third and fourth pereiopods short and stout, not quite reach- 

 ing to distal end of meros of second. Length of meros less 

 than three times its breadth. Carpus one half length of meros. 

 Both carpus and meros with spines on loiuer margin of distal end. 

 Propodos serrated on posterior surface. 



Fifth pair of pereiopods shorter and more slender. Telson 

 with median furrow. Two small spines on either side of furrow. 

 Outer plate of uropod minutely serrated on end. A sharp spine 

 on its outer distal angle. 



Principal variations from A. hippothoe — 



In new variety : Peduncle of outer antennae longer than that 

 of inner. Lamellar portion does not reach end of peduncle. 

 Third maxillipedes do not reach beyond antennal peduncle. 

 Relative lengths of carpal joints of second pereiopods differ. 



Variations from var. edamensis — 



Finger of small hand shorter than palm (longer in eda- 



