CimSTACEA OF THE MEKGTJI ATJCHIPELAGO. 173 



emarginate in the middle, and is perfectly smootb.. The four 

 subequal postfrontal lobes are little prominent, so that they do 

 not conceal the anterior margin of the front, when the carapace 

 is looked at from above. The upper orbital margin is very 

 oblique. The straight lateral margins o£ the upper surface of 

 the carapace are nearly parallel, scarcely converging backwards ; 

 behind their lateral tooth (the acute external orbital angle) 

 they present a trace of a second tooth. The foremost of the 

 oblique elevated lines with which the sides of the upper surface 

 are provided projects a little externally beyond the lateral 

 margin, and sometimes even the next oblique line projects a little 

 beyond the lateral margin, though not so much as the foremost, 

 and in these specimens a trace even of a third tooth is 

 observed. 



As regards the under surface of the cephalothorax, I have 

 little to remark. The male abdomen has about the same form as 

 in S. quadrata, Fabr. (^ = ungulata, M.-Edw., = «^?zis, de Haan), 

 the penultimate joint appearing rather short in proportion to its 

 breadth. The last joint of the female abdomen is pushed deeply 

 into the penultimate. 



In the adult male the anterior legs are of unequal size. The 

 ischiopodite of the anterior legs is armed anteriorly with a 

 small acute tubercle. The acute upper margin of the arm 

 is entire ; its distal end is rounded and does not terminate in 

 an acute sj)ine. The anterior m^argin is dilated distally into a 

 triangular crest, which appears minutely denticulate anteriorly, 

 but is never armed with a spine. The acute under margin 

 is also almost entire. The outer surface of the arm is trans- 

 versely rugose, but the anterior and the inner surfaces are 

 almost perfectly femooth, the triangular crest of the anterior 

 margin presenting only some rugose lines on its inner surface, 

 and is separated from the rest of the inner surface of the arm by 

 the ordinary marginal row of hairs. 



The upper surface of the carpopodite is covered with many 

 minutely grauular, transverse lines, and the inner angle is not 

 armed with a tooth ; the inner margin presents a few short hairs 

 near the articulation with the arm. The convex outer surface 

 of the palm is almost smooth, being, however, minutely rugose 

 towards the upper margin and close to the articulation with the 

 wrist, and minutely punctate near the articulation with the 

 mobile finger. The rounded under margin presents some deli- 



