Boone, Crustacea, Cruise of "Alva," 1931 225 



terior lateral margin is widely rounded; the greatest width of 

 this joint is across the upper median two-fifths ; the third, fourth 

 and fifth joints are similar to those of the third legs ; the pectinate 

 teeth of the anterior lateral margins being stronger on the fourth 

 legs. 



The fifth pair of legs has the sideplates squarish, a trifle wider 

 than deep. The first joint is much smaller than that of the pre- 

 ceding leg, being only three-fifths as long ; the width of the first 

 joint is three-fourths of the length of the anterior margin; the 

 posterior margin is very decidedly more convex than the anterior 

 margin; the third, fourth, fifth and sixth joints are quite small, 

 together being about equal to the width of the first article; the 

 second joint is quite short; the third joint is much wider than the 

 fourth, longer than the fourth and fifth, weakly pectinate on part 

 of the anterior margin; the fourth article is a little longer and 

 much wider than the fifth and also pectinate on the anterior mar- 

 gin ; the dactyl is minute. 



The telson is subequal in length to the coalesced fifth and sixth 

 segments, nearly as wide as long, with the lateral margins con- 

 vergent distally, forming an elongated arch, the apex of which 

 is subacute. 



The pleopoda have the peduncles stout, the branches well de- 

 veloped, multiarticulate ; margins setose. 



The uropoda have the peduncle of the first pair prismatic, 

 slightly longer than the related outer branch, with the small distal 

 lobe pectinate; these blades are also prismatic; the outer blade 

 has the outer margin smooth, the inner margin finely pectinate ; 

 the inner blade is the longer and has the outer margin coarsely, 

 and the inner margin finely, denticulate. The peduncles of the 

 second pair are similar to the first but slightly shorter and with 

 the inner apex more produced ; in length they are subequal to that 

 of the outer blades ; both blades are widely lanceolate, the inner 

 blade being much the wider and longer, but not quite so long as 

 the inner blade of the first pair and having the inner margin dis- 

 tally sparingly, and the outer margin, finely denticulate on the 

 distal portion. The outer blade is denticulate also on the distal 

 portion. The third peduncle is much shorter than the related 

 blades, being only about two-fifths as long and supporting the 

 widest pair of blades, the inner of which is the larger ; both blades 

 widen considerably from the base, attaining their respective maxi- 



