35° 



don't like to describe it as a new form, because the legs of the i^' and the s^'i pair are wanting: 

 it seems to belong to the Odeso-manus subgroup and appears related to A. microstyhis, but it 

 differs at first sight by the dactyli of the s'^^ and 4"^ legs being provided with an accessory 

 claw. When it once may prove to be a proper species, it will be one of small size, the 

 specimen being only 1 1 mm. long. 



Rostrum extremely short, broadly-triangular, obtuse, hardly projecting beyond the frontal 

 maro-in that runs transversely as in A. microstylus ; it is continued into a narrow, obtuse carina, 

 which is separated by narrow, though quite distinct grooves from the rounded, unarmed orbits, 

 to the base of which it reaches. Telson resembling that of A. Ltitifii, but somewhat less 

 narrowed posteriorly, its length (1,75 mm.) being 4,375-times the width of the posterior margin 

 (0,4 mm.); the greatest width anteriorly (i mm.) is 2,5-times that of the posterior margin. 

 Lateral margins straight, posterior margin rather prominent in the middle, the spinules of the 

 inner pair almost as long (0,36 mm.) as the posterior margin is broad, those of the outer 

 pair one-third of the latter; spinules of the upper surface small, 0,1 mm. long, inserted 

 one and a half as far from the median line of the telson as from the lateral margins, distance 

 between the anterior pair and the base two-fifths the length of the telson, posterior pair almost 

 as far distant (0,5 mm.) from the anterior pair as from the posterior margin (0,54 mm.). 



Second antennular article 2. 5 -times as long as thick, twice as long as the visible part 

 of the 1=', 2)'^ article one-fifth longer than the visible part of the i^'; stylocerite acute, reaching to 

 the middle of i^' article. Basicerite unarmed, carpocerite slender, reaching to the distal third 

 of 3"^ antennular article, terminal spine of the scaphocerite which is as long as the carpocerite 

 and the outer margin of which is distinctly concave, extending backward to the distal fourth 

 of 2°^^ antennular ardcle and projecting with three-fourths of its length beyond the narrow tip 

 of the blade, which, fringed with long hairs, hardly attains the end of the 2'^'^ antennular article. 

 Penultimate joint of external maxillipeds 3-times as long as thick, terminal joint 1^/3-times as 

 long as the penultimate, 5-times as long as broad at its base. Ischium-joints of 3''^ and ^^^ 

 legs with a small movable spine. Merus of 3^^^ legs 4-times as long (2,36 mm.) as broad in the 

 middle (0,6mm.), with a rather small, acute, apical tooth; carpus a little more than half 

 as long as the preceding joint, 4-times as long (1,45 mm.) as thick (0,37 mm.), slender, with 

 both the anterior and the posterior margin terminating in a short, acute tooth, for the rest 

 unarmed; propodus 1,5 mm. long, 0,28 mm. broad at the proximal extremity and 0,21mm. 

 at the distal one, 6-times as long as wide in the middle, with 5 or 6 pairs of spinules on the 

 posterior margin; the two spinules of each pair much differ in length, the longer almost as 

 long as the propodus is broad. The propodus is only 1,03-times as long as the carpus, the 

 anterior margin of both the propodus and the carpus setose, no spine at the distal extremity 

 of the anterior margin of the propodus; dactylus styliform, one-third of the propodus, armed 

 with a small, accessory claw, at one-fourth of its length from the tip. 



Legs of 4'^^ pair similar to those of the 3''', the merus with a comparatively still 

 smaller, apical tooth. 



Ova few in number, probably large. 



218 



