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Visible part of basal antennular article in the male a little more than one and a half 

 as long as the second and one-third longer than the distal article ; in one of the females the 

 visible part of the basal article does not yet appear one and a half as long as the second, 

 while in this female like also in the largest one the third article appears even a little longer 

 than the visible part of the first : in the largest female the median article appears but a little 

 shorter than the visible part of the first. The stylocerite reaches to the end of the median 

 article or slightly beyond it. 



Carpocerite twice as long as thick, shorter than the antennular peduncle ; scale of 

 scaphocerite as long as the antennular peduncle or, as in the male, a little longer, terminal 

 spine twice as long as broad, just reaching beyond the scale. 



Telson elongate, in the male 4-times, in the largest female 3,87-times as long as the 

 posterior margin is wide, the latter half as wide as the width at the base ; posterior margin 

 only a little prominent, not semicircular, outer angles not prominent ; the longer, inner spinules 

 measure two-thirds the width of the posterior margin, the outer ones are half as long and 

 reach to the end of the telson. The spinules of the upper surface are of moderate length, 

 those of the posterior pair measure in the male one-tenth, in the adult female one-twelfth the 

 length of the telson ; anterior pair situated just behind the middle, the proportion between the 

 length of the telson and the distance of that pair from the posterior margin being 2,1; the 

 proportion between the distances of both pairs from the posterior margin is 1,5. 



The male carries but one cheliped, that of the right side. Ischium twice as long as 

 wide at the distal extremity, upper margin with a movable spine at the apex, that measures 

 one-third the length of the member, two smaller spines in the middle behind one another and 

 two at the proximal extremity. The characteristic merus, 1,61 mm. long, is almost 3-times as 

 long as the preceding member ; the distal extremity is excavate, the distal half is widened, the 

 merus showing its greatest width at two-sevenths its length from the distal extremity; from this 

 point it gradually narrows towards the proximal articulation, the greatest width being in pro- 

 portion to the width at the proximal extremity as 40 : 1 7 and the greatest width, 0,56 mm., is 

 about one-third the length of the merus. While the upper margin is nearly straight, the lower 

 shows a S-like form. Carpus very short. Chela 2,24 mm. long, 1, 4-times as long as the merus ; 

 it much resembles the small chela of Ath. Djiboutensis Cout. (H. Coutière, "Les Alpheidae", 

 1899, p. 177, Fig. 209, the left) and it appears to be 4-times as long as high, when measured 

 in the plane of the fingers. The fingers that measure one-fourth the length of the chela, shut 

 together; the prehensile edge of the immobile finger is armed with eight, small, acute teeth, 

 almost along the whole length, the dactylus bears similar teeth, four of which near the articulation 

 are a little larger than the rest. While the upper surface of the palm is rather flattened, the 

 lower is swollen and bulging. 



The chelipeds of the female are equal, very small and much differ from the 

 described leo- of the male. In the largest female the ischium is 0,56 mm. long and 2,2-times 

 as long as broad; like in the male the upper margin carries a movable spine, long 0,155 mm., 

 both at the proximal and at the distal extremity and two smaller spines, behind one another, 

 in the middle; the upper margin is somewhat setose. The merus is 1,05 mm. long, almost 



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