224 Bulletin Vanderbilt Marine Muiseum, Vol. VI 



The second pair of gnathopoda have large branchial vesicles 

 with numerous pockets, as do also the succeeding pairs of legs. 

 The first joint is nearly straight, with the front margin of the 

 outer surface convex inf eriorly ; the front of the wrist is not pro- 

 duced downwards, but stands out from the hand; the chela- 

 forming portion is decidedly more produced than is true in the 

 first pair ; and is armed with nine primary teeth on the front mar- 

 gin and four primary teeth, besides the apex, on the hinder mar- 

 gin; the margin is almost continuously serrulate to these four 

 teeth ; the posterior margin of the hand has nine teeth ; the dactyl 

 is two-fifths of the length of the hand. 



The first pair of legs have the sideplates wider on the lower 

 portion than on the upper ; the first joint is arched near the base ; 

 the second joint is small, bent, elbow-like, scarcely longer than 

 wide; the third article is slightly wider but not so long as the 

 fourth and with a distal rounded lobe on the anterior margin ; the 

 posterior margin is finely pectinate; the fourth joint is similar 

 to the third, narrower, with coarser, pectinate teeth on the hind 

 margin ; the fifth joint is about one-fourth longer than the pre- 

 ceding one, slenderer, tapered distally, and with the posterior mar- 

 gin coarsely pectinate; the dactyl is quite small, its length less 

 than twice the distal width of the propodus, and curved, acuminate. 



The second pair of legs is similar to the first pair, but has 

 the third, fourth and especially the fifth joints longer, with the 

 pectination much reduced on the third and fourth joints. 



The third pair of legs has the side plates with the anterior 

 lobe nearly acute, the posterior one square; the first joint is oval 

 with the posterior margin much more convex than the anterior, 

 the anterior margin with ten to twelve fine serrate teeth ; distally 

 this margin is rather squarely produced beyond the convex pos- 

 terior margin ; the second joint is short, curved ; the third joint is 

 wide and longer than the fourth and has fine pectinations along 

 most of the anterior margin; the fourth joint is also pectinate; 

 the fifth joint is about one-third longer than the fourth, slenderer, 

 and nearly smooth ; the dactyl is slender, short, tapered. 



The fourth pair of legs has the sideplates not so wide as 

 those of the preceding pair; the first joint of the fourth legs has 

 the same length as that of the third legs, but is very much wider, 

 with the anterior margin finely pectinate on the lower part, 

 distally very little produced beyond the second article; the pos- 



