Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 27 



sively increasing size, along the outer lateral margin, the ninth spine 

 being twice as long as the previous one, and situated on the outer 

 distal margin of the article ; each spine is ciliate along its inner lateral 

 margin. The distal article of the outer blade is two-thirds as long as 

 the proximal article, oval, cilated. 



The eyestalk is short, cylindrical, the cornea spherical, of about the 

 same diameter as the stalk, set obliquely terminal upon it. 



The antennulae are short, the three peduncular articles clavate, 

 subequal; the upper flagellum slender, composed of 42 cilated rings; 

 the shorter branch of the lower flagellum consists of 24 rings, while 

 the longer branch is subequal to the upper flagellum. 



The antennae have the peduncular article short, a tooth at its outer 

 distal angle, its upper margin rounded ; the acicule extending nearly 

 half its length beyond the first joint, flat on the dorsal surface, its 

 lateral margins keeled, convergent distally, the tip down-curved, 

 acute. The scaphocerite is three and one-half times as long as wide, 

 oval, its distal and inner lateral margins fringed with plumose setae ; 

 it is about twice as long as the eye. The second and third peduncular 

 articles are clavate, subequal, extending slightly beyond the eye; the 

 flagellum is slender, consisting of 36 rings. 



The first maxillipeds are slender, leg-like, the propodus suboval, 

 laminate, with a dense brush of setae on its distal and upper lateral 

 margins, the dactyl is very small, curved, acute-tipped, fitting across 

 the curved distal border of the propodus. 



The second maxillipeds form the retrochela, the ischium is elongate 

 and excavate on its inferior lateral margin ; the merus is about as long 

 as the carapace, its upper margin convex medially and slightly excavate 

 distally; the lower margin excavate for the reception of the reflexed 

 propodus ; the carpus is very small, convex, wider distally and fits into 

 the grooved under side of the merus ; the propodus is long, narrow and 

 rather compressed, thin, the outer margin rounded distally and with 

 one subdistal tooth; the opposite margin is set with a row of saw- 

 tooth like denticles; there are three long, acute, articulated spines 

 proximally, on the inner margin, also three cavities into which the 

 teeth of the dactyl fit ; the dactyl is slender, very curved distally with 

 one rapier-like distal tooth and two slenderer, curved, acute, unequal 

 teeth arising from the inner margin. 



The third maxillipeds and first and second thoracic legs are similar, 

 successively decreasing in size posteriorly ; the merus is arched, elong- 



