Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 75 



spine on the lower surface in line with the eye ; the peduncle does not 

 quite extend to the tip of the rostrum ; the flagellum is slightly longer 

 than the peduncle. There is a strong, upward directed spine on the 

 superior orbital margin; the postorbital spine is long, slightly ex- 

 ceeding the eye. There is a row of spines and spinules on the ptery- 

 gostomian region extending to the antennal base; there is one long 

 spine at the corner of the buccal cavity. The regions of the carapace 

 are clearly delineated by grooves; its surface is paved with unequal 

 granules. There is in the median line two well-separated spines on the 

 gastric region, one on the summit of the cardiac and one on the intes- 

 tinal region. The first abdominal segment in the male is produced 

 into a posterior pointing, acute, horizontal spine. The anterior of the 

 gastric spines is flanked on either side by two transverse spines and 

 anterior to the outermost one of these is a single larger spine. On the 

 inner part of the branchial region there are three small spines ; on the 

 anterolateral margin there are three spines, one hepatic and two 

 branchial, above the eheliped. The sternum of the male is coarsely 

 granulate, as is also the abdominal belt, which is vaulted in the median 

 line. The female abdominal belt it said to have a median tubercle on 

 the third and fourth abdominal segments. 



The external maxillipeds have the ischium cleaver-shaped, the outer 

 face with a deep, submedian, logitudinal groove on either side of 

 which it is convex ; the inner lateral margin is dentate ; the inner distal 

 angle rounded and produced. The merus has the inner distal angle 

 excavate deeply for the reception of the palp ; the inner lateral mar- 

 gin below this excavation is a decidedly round lobe. 



The antennulae are well developed and fold almost vertically with- 

 in the fossett. 



The chelipeds in the old males are slightly more than twice the 

 length of the carapace ; in the young males they are not so long. The 

 ischium, merus and carpus are finely granulate ; the merus is elongate, 

 cylindrical ; the carpus bulbous ; the palm swollen, a little shorter than 

 the fingers, which are decidedly curved inward, with a slight gape 

 proximally. 



The ambulatories are extremely long, slender, cylindrical, the merus, 

 carpus and propodus granulose, setiferous; the dactyl very slender, 

 acuminate, furnished on the lateral margins with a long fringe of 

 setae. 



