82 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



part slightly bent upward and with two prominent, acute teeth; the 

 outer lateral margin is rounded and crenulate, one or two tooth-like 

 tubercles appearing more prominent than the others ; the distal margin 

 is nearly at right angles to the outer lateral margin, a strong tooth 

 marking their union ; a lesser tooth marks the inner distal angle and 

 inside this there are one or two other serrations. The entire upper 

 surface of the second segment is coarsely granulate, especially on the 

 proximal portion ; the third segment, which is very small, fits into the 

 excavation above the proximal inner portion of the second segment 

 and has the inner lateral margin rounded, and the distal angle forms 

 a prominent tooth; the distal segment of the antennae is wider than 

 long, with the frontolateral margin broadly rounded and erenulated 

 by the coarse granules which pave the upper surface. 



The abdomen has the first segment short and less wide than the suc- 

 ceeding segments, with the lateral region more coarsely granulate and 

 rounded, one or two teeth. The second segment is twice as long as the 

 first, with a transverse constriction near the anterior margin, the re- 

 mainder of the segment convex, slightly humped in the median re- 

 gion, the lateral margin prominently rounded and erenulated with 

 about 15 teeth, those teeth on the anterior half being the larger ; there 

 is a distinct V-like groove on the epimeral region, the posterior mar- 

 gin is fringed with very fine cilia. The third segment is as long in the 

 median line as the second, with the hump more accentuated and the 

 epimeral margin much narrower, granulated, overlapped proximally 

 on the anterior margin by the epimera of the second segment, the 

 lateral margin truncated and dentated ; the fourth segment is similar 

 to the third segment, but a trifle longer in the median line, with 

 the epimeral region narrower than the third. The fifth segment 

 is scarcely three-fourths as long as the fourth, with the anterior 

 margin quite arcuate, the median hump less pronounced, the lateral 

 region very narrowed, granulose, margin dentated. The sixth seg- 

 ment is about as long as the fifth in the median line, less wide, 

 being excavate at the base of the uropod. There is a pattern formed 

 by three transverse lines among the paved granules of this seg- 

 ment, one line being arcuate near the median anterior margin, the 

 other two forming a pair of transverse lines, one on either side of 

 the segment. The telson is wider than long, granulose and setose, 

 the proximal portion more so, five-lobed, the thinner distal margin 

 with radiating fine riblets, the laterodistal margins broadly rounded. 



