Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 11 



the carapace, triangulate, apex produced, broad, lateral margins exca- 

 vate, outer angles blunt, obtuse. Superior orbital margin unbroken, 

 postorbital angles acute. There are a pair of wide, transverse rugae 

 on the anterior part of the gastric region ; the remainder of the cara- 

 pace is devoid of rugae, minutely, sparsely granulate and finely hir- 

 sute; the cervical and cardiac regions are not areolated. There is a 

 shallow depression on the rostrum. The abdomen has the proximal 

 pair of sutures in the telson transverse and the distal pair of sutures 

 oblique. 



The eyestalk is very short, dorsally constricted and produced on the 

 upper distal surface into an anterior rounded lobe followed by a tri- 

 angular lobe which projects upon the cornea for about half of its 

 depth. 



The antennulae have the basal article greatly enlarged, lobate, with 

 the external margin traversed by rugae and the inner half of the dis- 

 tal margin rounded, crenulate, the apex sharp at the inner orbital 

 angle, the outer half of the distal margin also rounded ; the next two 

 joints are slender, cylindrical and fold within the antennal fossett; 

 the flagellum is short, two-branched, hirsute. The distal margin of 

 the basal joint is visible in a dorsal view as a rounded lobe between 

 two small triangulate points. This projects on each side beyond 

 the margin of the rostrum. 



The antennae have the basal articles short, produced on its anterior 

 distal angle into a small, dorsally concave, triangulate process which 

 has the margins finely serrate and terminates anteriorly in a promi- 

 nent, tooth-like apex; the second article is slightly longer than the 

 first and is cylindrical; the third article is about half the size 

 of the first; the flagellum is about two and one-half times as long as 

 the carapace is wide, and consists of many annulations, each of which 

 is about twice as long as wide and devoid of setae. 



The external maxillipeds have the ischium of the endognath broadly 

 rounded distally and somewhat widened at the external distal angle ; 

 there is no separate lobe on the ischium at the base of the merus ; the 

 merus is produced on its inner lateral margin in an acute triangulate 

 process which extends inwards for two-thirds of the width of the 

 ischium ; the three-jointed palp is large and well furnished with long 

 brushes of plumose setae. 



The chelipeds are slightly unequal; the merus is roughened on its 

 dorsal surface by a few spiny rugae and produced on its anterior 

 dorsal angle into a prominent, acute, triangulate tooth, which is sub- 



