A XONYX AMPULLA. 117 



animal ; the secondary appendage is about the length of 

 the first articulus of the flagellum, and consists of one 

 long and two very minute articuli. The inferior antenna? 

 are very slender and delicate ; they are more than half the 

 length of the animal, and generally lie concealed beneath 

 the body ; the peduncle reaches rather further than the 

 peduncle of the superior, only two of the joints are 

 visible beyond the margin of the head, of which the 

 penultimate joint is very broad, and continues so to its 

 extremity, whereas the ultimate is considerably narrower, 

 but still very much broader than the articuli of the fla- 

 gellum ; the first articulus of the flagellum is longer 

 than either of the others, but very small in diameter, 

 while all the others are still more so a circumstance 

 that renders the entire flagellum exceedingly fine. The 

 epistoma is produced to a sharp spear-like point, directed 

 straight forward. The mandibles have the second joint of 

 their appendage much longer than the terminal. The coxae 

 belonging to the first and second pairs of legs have the in- 

 ferior margin smooth, except towards the posterior angle, 

 which is elevated to a small tooth, immediately before 

 which is a depression, from the bottom of which springs 

 a short stiff solitary spinule. The first pair of legs have 

 the hands long and narrow, the upper and lower margins 

 being parallel ; the palm is slightly oblique and straight, 

 but obsoletely crenulated, and defined by an obtuse angle, 

 a little anterior to which stands a short stout spine, which 

 is opposed to the tip of the closed finger ; the finger is 

 as long as the palm, and slightly curved. The second 

 pair of legs are very long and slender ; the third joint is 

 longer than the fourth, it is the great length of this 

 joint that gives the peculiarly slender and feeble appear- 

 ance to this leg throughout the genus ; the wrist is 

 rather longer than the hand, and has the inferior margin 



