359 



the scaphocerite, the outer margin of which is sHghtly concave, as in A. clypeahis, reaching 

 to or perhaps even just beyond the end of the carpocerite, extending backward to the middle 

 of the 2°<i antennular article and projecting, like in A. clypcatus, by two -fifths of its length 

 beyond the tip of the rather narrow blade, which is fringed with long hairs and just reaches 

 to the end of the antennular peduncle. 



Penultimate joint of external maxillipeds slender, 2,5-times as long as the distal extremity 

 is thick, terminal joint one and a half as long as the penultimate, 5-times as long as broad 

 or thick at its base, in a lateral view. 



Larger cheliped missing. Merus of the smaller cheliped 3-times as long as broad, upper 

 margin unarmed, infero-internal margin with a strong, slender spine near the distal 

 extremity, the length of this spine is one-third the greatest width of this joint. Chela 2,1 mm. 

 long, half as long as the carapace (4,3 mm.), fingers very little shorter than the palm, proportion 

 between the length of the fingers and that of the palm as 10: ii; chela almost 4-times as 

 long as the palm is high (0,55 mm.). 



Merus of 2"<i legs 8-times as long as broad. Carpal segments 0,64 mm., 0,82 mm., 

 0,3 mm., 0,3 mm. and 0,43 mm. long, chela 0,83 mm. long (palm 0,38 mm., fingers 0,45 mm.); 

 the 2°<J segment, 5-times as long as thick, is 1,28-times as long as the i=^ the i^' one and 

 a half as long as the 5"^ the y^ and the 4''^ equal, half as long as the i*^' and almost twice 

 as long as thick, the chela, finally, is as long as the 2"^'' segment and a little longer than 

 the 4* and the 5"^ together. Ischium of ■x,''^ and 4'^ legs with a strong movable spine. Merus 

 of 3''' legs 4, 5-times as long as broad in the middle, glabrous, armed with a strong, acute, 

 apical tooth like in A. buccphahis^ carpus half as long as the preceding joint, 3, 3-times as long 

 as thick in the middle, its posterior margin terminating in a strong, acute tooth, for the rest 

 unarmed. Propodus 1,24 mm. long, one- fourth longer than the carpus, 5-times as long 

 as broad, its posterior margin with 6 strong spines; there is also a spiniform seta at the end 

 of the anterior margin, on which one observes also some other setae, like on the anterior 

 margin of the carpus; dactylus simple, two-fifths of the propodus and just half as long as the 

 carpus. Merus of the 4"^ legs 4, 8-times as long (1,72 mm.) as broad in the middle (0,36 mm.), 

 armed with an equally strong, apical tooth as the merus of the 3''' legs; carpus half as long 

 as the merus, 3,6-times as long as thick, for the rest similar to that of the -^^ legs; laropodus 

 1, 3-times as long (1,12 mm.) as the carpus (o,S6 mm.), 5-times as long as broad, with 7 strong 

 spines on the posterior margin and a shorter one at the distal end of the anterior, which, like 

 the anterior border of the carpus, bears a few long setae of different length; dactylus, like 

 that of the preceding legs, two-fifths of the propodus, simple. 



Eggs few in number, ovoid, one and a half as long as broad, large, 0,76 — 0,78 mm. long. 



Length from tip of rostrum to end of telson 11,5 mm. 



Remarks. A. criuitiis Dana differs by its much larger size, by the different shape 

 of the telson and the different arrangement of the spinules on its upper surface and on its 

 posterior margin. The rostrum is longer, not continued backward beyond the orbital hoods, 

 the 2""^^ antennular article is also longer. There are, finally, also differences in regard to 

 the legs. 



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