Boone, Crustacea, Cruises of ''Eagle" and " Ara," 1921-28 85 



only three-fourths as long and bears the two-branched flagellum, the 

 slenderer, longer branch of which consists of 15 annulations, tipped 

 with a tuft of setae, and is about equal in length to the third pedun- 

 cular article ; the thicker branch of the flagellum is only three-fourths 

 as long as the other branch but consists of 15 very short annulations, 

 which all bear distally on their inferior side a dense brush of setae. 



The basal antennal article is short and only visible dorsally as a 

 node at the inner distal angle ; the second article is broadly lobate, its 

 dorsal surface marked by a slightly oblique longitudinal carina, which 

 extends to the tip of the apical tooth. There are two sharply incised 

 triangular teeth on the outer convex margin of this article and three 

 similar but smaller teeth on the inner lateral margin in addition to 

 the basal tooth, which is separated from the other three by a concave 

 ridge. There is a deep sulcus on the inner half of this article between 

 the median ridge and lateral margin; the third article is small and 

 narrow, forming a basal articulation for the wide, fan-like, broadly 

 rounded distal lobe which is cut marginally into five broadly rounded, 

 truncate teeth or lobes, the outermost of which is the widest, and a 

 sixth, smaller, triangulate tooth on the inner lateral margin. The 

 entire dorsal surface of the antennae is covered with stocky elavate 

 setae, which also fringe the margin. 



The eye is small, the stalk cylindrical, calcareous, constricted below 

 the cornea and produced into a tongue-like process projecting on the 

 upper surface of the cornea. 



The sixth abdominal segments and the proximal two-fifths of the 

 telson are covered with a definite pattern formed by squamous tu- 

 bercles, each of which is fringed along the posterior margin by short 

 setae. On the first two fourth segments, inclusive, there are transverse 

 setae. The posterior margin of each of these segments is slightly 

 notched in the median line. The second, third and fourth segments 

 are marked by a blunt median dorsal ridge. The first segment is not 

 so wide as the others and has its lateral margin rounded. The second 

 to fifth segments have their margins lobate, slightly pointed. The 

 base of the uropoda is promixally covered with squamae. The distal 

 three-fifths of the telson and caudal fan is covered by fine radiating 

 striae. 



The five pairs of legs are monodactyl, the first pair much shorter 

 and stockier than the other; all with acute, hook-like dactyli. The 

 second pair are the longest, the third, fourth and fifth pairs decreas- 

 ing slightly in length. 



