4o8 



the carapace, rostrum included. Orbital region a little more than half as broad as the anterior 

 margin of the carapace; its anterior margin is truncate like in A. pareuchirtts, eye-hoods 

 rounded, unarmed, corneae large. 



Telson almost twice as long as broad anteriorly, distance between the postero-lateral 

 ano-les just half the greatest width ; anterior pair of spinules one and a half as far distant from 

 the posterior than from the anterior margin. 



Second antennular article, in adult specimens, twice as long as thick, as long as the 

 visible part of the first, third article two-thirds the second; according to Coutiere's figure 

 (Alpheidae Maid, and Laccad. Archip. 1905, PI. LXXXIV, fig. 43), in A. pareuchirus the 

 second article appears distinctly longer than the first. Stylocerite terminating in a slender spine 

 that is directed straightly forward and that reaches to the 2"'^ fourth part of the second article; 

 in younger specimens it hardly reaches beyond the first. 



Basal spine of basicerite very small. Carpocerite as long as the scaphocerite, slightly 

 longer than the antennular peduncle; the scaphocerite, the outer margin of which is slightly 

 concave, appears not yet 3-times as long as broad, being in the adult, egg-bearing female 

 from Stat. 114 3 mm. long and 1,16 mm. broad. The terminal spine, that is directed inward, 

 measures about one-third the length of the scaphocerite and appears less slender than that of 

 A. pareuchirus^ being only 2Y3-times as long as broad at its base, in A. pareuchirus, however, 

 4-times; the terminal spine projects also less far beyond the tip of the blade, for it extends 

 only with one-sixth of its length beyond it and the blade appears therefore also distinctly 

 lono-er than the antennular peduncle. In young individuals the blade reaches to the end of the 

 antennular peduncle and the 2°^' joint of the latter appears here slightly shorter than the visible 

 part of the i^'. 



External maxillipeds slender, reaching to the end of second antennular article; penultimate 

 joint 4-times as long as thick, terminal joint one and a half as long as the penultimate and 

 8-times as long as broad at its base; a short tooth or spine at the distal end of the upper 

 margin of the antepenultimate joint. 



Only one specimen bears the larger chehped, a young specimen long 14,5 mm. without 

 eo-o-s and without the small cheliped, so that it is doubtful whether it is a male or a female; 

 this specimen was collected at the Stat. 114. The merus of this leg is rather slender, about 

 6-times as long as broad in the middle; upper margin unarmed at the extremity, infero-internal 

 maro-in with a large, acuminate tooth at the far end and with 2 much smaller spinules in the 

 middle. The chela much resembles that of A. pareiichirus, but the fingers are comparatively 

 shorter. The chela, indeed, 7,2 mm. long and 2,4 mm. high, is just 3-times as long as high, 

 but the fingers, 2 mm. long, measure little more than one-fourth the length of the 

 chela. Just as in A. pareuchirus, the upper border of the palm is emarginate, immediately 

 behind the articulation of the dactylus, and terminates in a subacute tooth ; from this emargination 

 a groove or depression runs backward just below the rounded, upper border of the palm, both 

 on the outer and on the inner face; the groove on the outer surface has parallel margins and 

 reaches to the proximal third of the palm, that on the inner appears triangular and extends 

 only to the middle. The lower margin of the chela appears as little emarginate at the 



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