Boone, Crustacea, Cruises of "Ara'* and "Alva" 



263 



The antennal acicule is narrowed, irregularly triangular, ir- 

 regularly spinose on the inner lateral and distal margins, also 

 beset with numerous tufts of setae along the margins. The apex 

 is directed obliquely outward, extending above the predistal pedun- 



Text figure 14. — Pagurus cataphractus Boone, type: A, section of antennae, 



showing the twenty-fourth to thirty-fifth articles; B, propodus and 



dactyl of leg, showing groove and spinose ornamentation. 



Both greatly enlarged. 



cular article for little more than half its length. The antennal 

 flagellum has each of the articles comprising the distal three- 

 fifths of the whip produced into a protruberant convex dilation 

 at the inner distal angle. This peculiar formation of the flagella 

 is a subtle mimicry of the fronds of one genus of Indo-Pacific 

 hydroids. 



The chelipeds are unequal, the left one greatly exceeding the 

 right, in the ratio shown in plate 103 ; neither hand is inclined in- 

 ward. The left cheliped averages a length of 1.5 times the total 

 length of the carapace, only the merus, carpus and propodus 



