44 Bulletin Vanderbilt Marine Museum, Vol. VI 



second segment, which bears about six, the inner two spines being 

 widely submedian, the remaining four, two on each side near the 

 outer lateral region. An encrusting growth on the carapace makes 

 it impossible to say reliably whether or not there are more than 

 six spinules here. On the anterior margin of the third abdominal 

 segment there are no spinules. The first abdominal segment is 

 short, partially concealed, with a median transverse ridge and 

 with the lateral margins small, subacute, forward-directed. The 

 second segment is longer, with two long transverse ridges across 

 the entire segment, and a shorter, curved ridge anterior to these, 

 forming the anterolateral border of the widely rounded lateral 

 margin. The third abdominal segment has two transverse ridges, 

 the anterior of which is the wider, and also a smaller ridge on the 

 anterior margin of the narrow, acute lateral area. The fourth 

 abdominal segment is also subacute laterally and has two trans- 

 verse, ciliated ridges across the median area and a third, shorter 

 ridge curving along the anterior lateral region near the margin. 

 The fifth segment is usually ventral in position and is distinctly 

 longer in the median line than the preceding segment and much 

 narrowed on the anterior half, the postlateral angle being nar- 

 rowly rounded ; the sixth segment is narrower and a little shorter 

 in the median line than the fifth and is marked by two transverse, 

 curved ridges ; the telson is little longer than the sixth segment, 

 its posterior margin widely rounded, ciliated, weakly bilobed in 

 the median line and cut by oblique lines on each half ; the dorsal 

 surface is marked by crescentic squamae outlined by short setae. 

 The uropoda have the peduncle short, wide, strong; both blades 

 are bluntly truncate, each a little shorter than the telson and with 

 similarly ciliated margins ; the outer blade is narrower than the 

 inner blade, which is expanded on its rounded inner lateral margin. 



The eyes are large, blackish, renif orm. 



The antennulae have the first article produced into a very long, 

 acute spine at the outer lateral angle, this spine curved upward, ex- 

 tending for a considerable distance beyond the eye and reaching 

 almost as far forward as the median rostral spine; the second 

 article is narrow, cylindrical, reaching slightly beyond the eye 

 and armed at the inner and outer distal angles, each with a spine ; 

 the remaining articles are broken off. 



The antennae have the basal article widest and produced to a 

 long acute spine at its inner distal angle; the second article is 



