ORDER MYRIAPODA. 129 



pair, and at the third forty-three. The body then, is com-" 

 posed of thirty segments. Finally, in the adult state, the 

 male has thirty-nine, and the female sixty-four. Two years 

 after, they moult again, and it is only then, that the organs 

 of generation appear. From the birth, which takes place in 

 March to November, the time in which M. Savi ceased his 

 observations, these changes of the skin are renewed from 

 month to month very nearly. In what the insect casts off, 

 we can discover even the membrane which lines the alimen- 

 tary canal, and the tracheae. The organs of the mouth are 

 the only parts which M. Savi could not find. 



These insects feed either on animal or vegetable substances, 

 but in a state of death and decomposition, and they lay in 

 the earth a great number of eggs. 



They form in Linnaeus, but one genus — 



The Iuli (Iulus, L.), 



Which we divide as follows : — 



Some have the body crustaceous, without appendages to 

 the end, and the antennae swelled towards the summit. 



The Glomeris (Glomeris, Latr.), 



Similar to wood-lice, oval, and rolling themselves up in a 

 ball. 



Their body, convex above, and concave underneath, has, 

 along each of its lower sides, a range of small scales, analo- 

 gous to the lateral divisions of the trilobites. It is com- 

 posed, without reckoning the head, of but twelve segments or 

 tablets, the first of which, more narrow, forms a sort of 

 collar, in a transverse semi-circle. The following segment 

 and the last are the largest of all. The number of feet in 

 the females is thirty-four, and thirty-two in the males, their 



VOL. XIV. K 



