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STALK-EYED CRUSTACEA. 



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dinal line on the middle of the dorsal side. Ophthalmic scales long, pointed, 

 grooved on the dorsal side. Antennular and antennal peduncles not much 

 lon^>-er than the eye-stalk. Second segment of antenna produced on the 

 outer side into an acute process which reaches about one third of the way to 

 the tip of the antennal acicle ; there is also a minute acute tooth at the inner 

 distal ano"le of this segment of the antenna. The acicle is somewhat shorter 



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than the eye-stalk. 



Chelipeds very unequal in size. Right cheliped reaching forward about 

 the same distance as the ambulatory legs. The merus of this appendage 

 reaches but little beyond the eye ; it is trigonal, the surface for the most 

 part smooth and naked, the upper margin obtuse and unarmed, the distal 

 dorsal border armed with three small acute teeth ; the lower face of the 

 merus is somewhat hollowed out and the antero-lateral margins on either 

 side of the articulating membrane between this segment and the carpus are 

 cristate and denticulate. The carpus widens from the proximal to the distal 

 end where the width exceeds the length of the segment; its upper surface 

 is convex, naked, rather sparsely ornamented with very minute tubercles 

 visible under a lens, its inner margin armed with about nine coarse blunt 

 teeth (alternately larger and smaller), its outer margin clearly defined by a 

 low, obscurely toothed ridge. The hand is very broad, its upper face convex 

 in both directions, and set with minute rounded tubercles which increase in 

 size on the distal part of the segment, especially on the immovable finger; 

 the inner border produced into bluntly toothed crest which projects far be- 

 yond the corresponding border of the dactylus; the outer margin is defined 

 by a crenate rim ; the lower face is beset with low, inconspicuous, granular 

 tubercles. The outer margin of the dactylus is cut into rounded teeth, and 

 a conspicuous blunt-toothed ridge runs the length of the upper face; the sur- 

 face between this ridge and the outer edge is deeply concave; the prehensile 

 edo'es of both fingers are armed with coarse calcareous teeth. 



The left cheliped is very small and slender, reaching only to the distal 

 end of the carpus of the left ambulatory appendages. The merus is laterally 

 compressed ; its upper margin is rounded, the lower external margin is 

 spinulose at the distal end, near the articulation with the carpus. The upper 

 side of the carpus is concave and bordered on each side with a row of spines; 

 there is a sharp tooth at the distal end of the external inferior margin. The 

 chela is longer than the carpus, with fingers longer than the palm ; the dorsal 

 face of the hand is convex, rising into an obscurely tuberculated ridge which 



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