SMYNTHUEUS. 105 



and then follow a number of small teeth, whicli end at 

 a point where the two maxillse converge towards the 

 middle line so as to touch one another. The under lip is 

 stronger, and consists of two somewhat quadrate lobes. 

 The feet of Smynthurus are very peculiar, and differ in 

 the different species. Nicolet has given two figures 

 of a foot, seen from different sides ; but neither of them 

 agrees altogether with any of those examined by me. 

 In my specimens (PL LXV, fig. 3) the tarsus was very 

 short, and bore two peculiar appendages. On the outer 

 side was an elliptic, elongated claw, transparent above, 

 terminating in a spine, and bearing also one large 

 tooth and three smaller ones on its underside. On the 

 underside of the tarsus is a second claw, smaller and 

 more slender than the first. At its free end it is 

 produced into two processes and a small spine ; the 

 shorter process reaches about as far as the free end of 

 the other organ, and is like a spine in form, though 

 apparently not so stiff; the second process is some- 

 what longer, and whip-like. 



The anterior legs are the shortest, and the posterior 

 the longest, the middle pair being intermediate in size 

 as well as in position. The relative proportions of the 

 segments, as well as the structure of the foot, are the 

 same in all three pairs. The tarsus is very short; the 

 tibia is much the longest segment. The coxa, tro- 

 chanter, and femur diminish in diameter, and increase 

 in length. At the attachment of the leg are one or two 

 deep folds, which, however, are not, I think, to be 

 considered as indicating true segments ; and we may, 

 therefore, consider the segments as being five in 

 number. The legs are regularly, but not very densely, 

 clothed with hairs. 



The spring consists, as in all Smynthiiridce, of a 

 basal portion and a pair of 2-jointed arms (PI. LXIII, 

 fig. 5). The basal segment of the arms tapers 

 slightly ; it bears a number of short and simple, as 

 well as three tenent, hairs. The terminal lamella is 

 oval, without hairs, but with a row of minute teeth 



