Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 79 



deep curved furrow extending across it the lateral margin. There 

 are one or two rounded tubercles on the hepatic lobe and two on the 

 branchial lobe near the outer margin. The epimeral plates are well 

 developed and are produced into a spine between the first and second, 

 the second and third, the third and fourth ambulatories. 



The basal antennal article has its outer margin coarsely granulated, 

 its inner margin armed with two prominent rounded teeth, the upper 

 of which is nearly as large as the third, or distal tooth. 



The antennulae fold vertically beneath the rostrum. 



The external maxillipeds have the ischium with its outer margin 

 thickened, its inner margin coarsely dentate and produced into a lobe 

 at the inner distal angle ; there is a longitudinal groove on the outer 

 face which is also granulose and setiferous; the merus is three-fifths 

 as long as the ischium, with the outer angle slightly rounded laterally 

 and truncated distally, excavate at the inner distal angle for the 

 reception of the antennal palp, and below this excavation produced to 

 a prominent, flaring, rounded lobe ; the palp is stocky, with the basal 

 joint enlarged, three-fifths as thick as long. 



The female abdominal belt has the first segment dorsally visible, 

 curiously produced into a long, acute, horizontal, conical spine; the 

 second, third and fourth segments are narrow, hinge-like with the 

 median region arched ; the fifth and sixth segments are fused, forming 

 a large, circular disc, with a narrow elevated arch extending two- 

 thirds its length, the remaining external surface flat, granular; the 

 seventh segment is small, rounded distally and downbent. 



The female chelipeds are small, equal; the ischial and meral joints 

 together form a curved arch around the granulose pterygostomian 

 region ; the carpus and propodus are bent downward above the mouth- 

 parts ; the propodus is weak, narrow, a trifle distally and is no wider 

 than the merus; the fingers are as long as the hand, tapering, finely 

 denticulated. The male chelipeds are much stouter and have the 

 palm inflated. 



The order of length in the ambulatories is 2, 3, 4, 1, the first leg 

 reaching only to midway the propodus of the second leg ; the third leg 

 is subequal to the second, and the fourth leg reaches not quite to the 

 tip of the propodus of the third leg. All four legs are dorsoventrally 

 flattened, the upper surface moderately convex, the lateral margins 

 shaggy with long setae. 



