SUPPLEMENT TO ORDER MYRIAPODA. 139 



first pair of these organs of motion will correspond to the 

 second segment, the second to the third, the third to the 

 fourth, fourth to the fifth, fifth to the sixth. The duplica- 

 tion afterwards is continued Avithout interruption in the 

 females, but in the males there is but a single pair at the 

 seventh segment, in consequence of the situation of the 

 sexual organs in that part. These first segments thus appear 

 to represent the trunk of other insects. 



The determination of the species of iuli, having been es- 

 tablished on the number of feet, it was natural to expect 

 some error in the specific characters, as authors in general 

 believed that each ring had two pair of feet. The two last 

 rings are totally without them. The penult has the middle 

 of its hinder edge advanced into a point, it partly receives 

 the terminal segment, which is composed of two valves 

 rounded at the internal edge, applied against each other, 

 and opening in a passage for the excrements and eggs. 



The feet are very small, disposed in two series closely 

 approximating in a horizontal direction at their base, and 

 subsequently forming a crotchet ; they are composed of six 

 small articulations, and have a conical and corneous point. 



The iuli, notwithstanding the great number of their feet, 

 are by no means agile, on the contrary they walk very slowly 

 and seem to glide along like earth-worms. They cause 

 their feet to act, one after the other, in slow and regular 

 succession. Each range forms a sort of undulation ; they 

 move at the same time their antennse, appearing to employ 

 them to feel the ground ; and the body on which they are 

 walking. In a state of repose, these insects have their body 

 rolled up in a circular or spiral figure, the head being in the 

 middle : they might be taken for little serpents. 



The iuli are found under stones, bark of trees, moss, &c. 

 They ai"e generally fond of places somewhat humid and ob- 

 scure. There is a southern species, however, which is rather 



