Decapod Crustacea of Bermuda. I'art If. 71 



Antennal scale and its spine about equal in length; the lamellar 

 portion is relatively narrow, regularly tape-red and acute. 



Spine of antennal scale reaches the end of the antennal peduncle 

 and considerably exceeds the peduncle of the antennules; its outer 

 margin is strongly incurved; its tip is straight and acute. The 

 large chela resembles that of A. hctcrocJicclis in general form and 

 sculpture, but there are constant differences in details. 



The dactyl is quite different, being much more obtuse, thicker, 

 less hooked below and more evenly arched dorsally, besides being 

 purple instead of white; it is also less hairy and smoother; the 

 plunger of the inner surface is thicker and differently shaped. 

 (See figs.) The tip of the immovable finger is also smaller and 

 more acute, curved up at tip. 



The palm is notched similarly, above and below, but the dorsal 

 notch is more abrupt and narrower in this species, while the ventral 

 one is less so ; the subdorsal groove of the outer surface, running 

 back from the notch, is somewhat hour-glass shaped, but does not 

 send a branch obliquely backward and downward as in hctero- 

 c/icclis. The latter also has a strong supermarginal sulcus on the 

 inner surface, parallel with the lower margin and running back to 

 the proximal articulation. It is lacking in this species. Breadth 

 of the palm is about half the total length, without the dactyl. 



The smaller chela is slender, rather small and nearly simple, 

 without a notch on either margin; the dactyl is slender, slightly 

 curved, and flattened above, tinged with purple at the tip. 



The legs of the second pair are slender and long; the carpus 

 has the first and second segments about equal, the second rather 

 longer ; third and fourth short and about equal, the two together 

 about equal to the first ; fifth about one-fourth longer than the 

 fourth, but rather shorter than the chela. 



The third and fourth pairs of legs are usually large, stout, and 

 compressed, especially the fourth pair, which are more than twice 

 as thick as the second or the fifth pair ; carpus, merus and ischium 

 have a distal spine, longest on the carpus : propodus hairy and 

 strongly spinose beneath, about six spines in the row ; dactyl long, 

 slender, curved, white, acute. 



The telson is somewhat tapered with the sides nearly straight ; 

 posterior end subtruncate, with two minute spinules at each angle ; 

 a distinct sulcus runs along the median line ; the four small dorsal 

 spinules are rather larger than usual in the genus. 



