Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 147 



The eye is large, spherical, set on a short articulated stalk. 



The inner antennae have the basal article concave beneath the eye 

 for the reception of the cornea, and terminating anteriorly at the 

 outer distal angle in a pointed tooth; the second article is stocky, 

 cylindrical, with the upper margin convex, cilated; the outer distal 

 angle produced into a long, triangulate tooth, closely applied against 

 the next segment and ciliated outwardly ; the inner lower, distal angle 

 is produced into the longest spine of the series, it extending the entire 

 length of the third article and being ciliated beneath ; the third article 

 is also cylindrical, about as long as the second, and supports the three- 

 whip flagellum ; the inner branch of which is single, slender ; the outer 

 branch is biramose after about the tenth annulation, the inner whip 

 is the shorter and the outer, the heaviest of the series. 



The external antennae have the basal article short, a conical tooth 

 at its outer distal angle; the scaphocerite is long, extending beyond 

 the peduncle of the inner antennae for a distance equal to the length 

 of the third article ; the outer margin of the scaphocerite is straight, 

 thickened, and terminates subdistally in an acute tooth, a suture line 

 extends obliquely in beside this tooth to about midway the scaphocer- 

 ite ; a groove extends subparallel and near to the outer margin ; the 

 distal margin is rounded and so is the inner lateral margin, both are 

 ciliate; the second and third peduncular articles are short, stocky, 

 lying beneath the scaphocerite and extending only half its length; 

 the flagellum is thick proximally, but very attenuated distally, and 

 is as long as the body of the animal. 



The external maxillipeds are slender, leg-like, bristling with setae. 



The first legs are extremely slender and weak, chelate, about as long 

 as the smaller leg of the second pair in young specimens, but shorter 

 in older ones. 



The second legs are decidedly unequal, the right being the larger. 

 One specimen in the American Museum from Panama has the second 

 legs about equal. The ischium is elongated, the merus a third longer 

 than the ischium; the carpus five-sixths as long as the merus; the 

 propodus, including the finger, three times as long as the merus, the 

 palm being cylindrical, slightly compressed laterally, the fingers 

 about as long as the palm, slender, cylindrical, each with one or two 

 large triangulate teeth, the tips curved upon each other. The distal 

 part of the merus and the entire carpus and propodus, including 

 the fingers, are covered with numerous fine rugosities set with setae. 



