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outer margin is much shorter. Like in A. bidens, the orbital region is very broad, occupying 

 four- fifths of the anterior margin of the carapace, the eye-hoods end anteriorly in an obtuse 

 tubercle and one observes also, between that tubercle and the rostrum, a rounded prominence 

 that reaches a little farther forward than the tubercle of the eye-hoods. 



Telson twice as long (2 mm.) as broad anteriorly (1,05 mm.), distance (0,7 mm.) between 

 the postero-lateral angles one-third of the length ; spinules of the upper surface large, the anterior 

 pair situated at the anterior third, the posterior pair a little farther distant from the posterior 

 margin than from the anterior pair. The two spines of the basal joint are of equal length, 

 the outer twice as broad as the inner. 



Second antennular article one and a half as long as broad, little longer than the visible 

 part of the i^', which is as long as the 3><i-, like in A. bidens the anterior margin of the 

 i«' article bears 2 spines. Stylocerite ending in a spine that is directed outward and that reaches 

 as far forward as the spines of the 1=^' article, i. e. to the 2°^ fourth part of 2°^ antennular article. 



Lower spine of the basicerite small, hardly reaching as far forward as the base of the 

 spine in which terminates the stylocerite; carpocerite as long as the antennular peduncle. The 

 scaphocerite, the outer margin of which is decidedly concave, projects beyond the end of the 

 antennular peduncle by half the 3'<i article ; the terminal spine, the tip of which is curved inward, 

 is a little more than half as long as the scaphocerite, projects with one-third of its length beyond 

 the tip of the blade, that reaches to the end of the antennular peduncle, and the spine appears 

 -,-times as lono- as its base is broad. The base of the .spine is as broad as the contiguous part 

 of the blade. External maxillipeds extending as far forward as the carpocerite; penultimate 

 joint one and a half as long as thick, the seta at the far end of the upper margin 3-times 

 as long; terminal joint" almost twice as long as the penultimate and almost 4-times as long as 

 broad at its base. 



Merus of the large cheliped stout, deeply concave at the distal extremity, the upper margin 

 terminating in a triangular, acute tooth; the greatest width anteriorly of the outer surface is a 

 little more than half its length. Infero-external margin of the merus rather coarsely denticulate or 

 serrulate along its whole length, infero-internal with an acute tooth at the distal end; margins 

 of the distal tooth of the upper margin with two or three setae. Large chela turned outward, 

 6 mm. long, one-fifth longer than the carapace; palm measuring three-fifths the length of the 

 chela, the height (2,25 mm.) of its outer (lower) face a little more than one-third the length 

 of the chela and equal to the length of the fingers. Upper (outer) border of the palm the 

 thickness of which is in proportion to its height like 3 : 4, marked with a narrow, deep groove, 

 near the articulation of the dactylus, as in A. bidens, but this groove is continued 

 on the outer (lower) face of the palm to near the entire and rounded lower border 

 of the latter. From the middle of this external portion of the groove a broad, though shallow 

 depression extends almost to the middle of the palm, to near the obtuse tip of the triangular 

 area, the upper boundary of which is arcuate, the lower nearly straight. The upper (outer) 

 border of the palm is rounded and ends obtusely. The dactylus is still more turned outward 

 than the palm, so that the articulation is situated in the plane of the outer 

 (lower) surface of the palm and the upper border of the dactylus situated almost inferiorly. 



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