MTRIAPODA. Si^. 



until November, at which time M. Savi terminated his observations, 

 these changes take place about once a month. Jn their exuvite, we 

 find even the lining membrane of the alimentary canal and tracheae. 

 The organs of the mouth were the only parts that Savi could not 

 discover *. 



These Insects feed on dead and decomposed animal and vegetable 

 matters; they deposit in the ground a large number of eggs. Ac- 

 cording to the system of Linnaeus they form but one genus, that of 



luLus, Lin. 

 Which we divide as follows : 



Some have a crustaccous body without terminal appendages, and 

 antennae enlarged near the end. 



Glomeris, Lat. 



Resembling Onisci; oval, and rolling into a ball; the body convex 

 above, and concave underneath, with a range of little scales analo- 

 gous to the lateral divisions of the Trilobites along each of its in- 

 ferior sides. It is composed, exclusive of tlie head, of but twelve 

 segments, the first and narrowest of v.^hich forms a sort of semicir- 

 cular transverse collar; the following and the last are the largest of 

 all; the latter is arched and rounded at the end. There are thirty- 

 four feet in the female, and thirty-two in the male, his sexual organs 

 replacing the pair that is deficient. These animals are terrestrial, 

 and live under stones in hilly places f. 



The body of the true luli is cylindrical and very long, and has na 

 ridge or trenchant edge on the sides of the annuli; they roll them- 

 selves up spirally. 



The larger species live on land, particularly in the woods and 

 sandy places, and diffuse a very disagreeable odour. The 

 smallest ones feed on fruit, or the roots and leaves of esculent 

 vegetables. Others are found under the bark of trees, in 

 moss, &c. 



I. maximus, L.; Marcgr., Bras., p. 255. Peculiar to South 

 America, and is seven inches long. 



I. sabulosms, L.; Schreff. Elem. Entom., Ixxiii; I. fa<;ciatus, 

 De Geer, Insect. VII, xxxvi, 9, 10; Leach, Zool. Miscell., 

 cxxxiii. About sixteen lines in length, of a blackish-brown, 



* See Bullet. G^n^r. et Univers. of the Baron F^russac, Decemb., 1823. The 

 observations of Savi, an extract of which is contained in this work, were published 

 in a memoir, intitled " Osservazioni per servire alia storia di una specie di Julus 

 communissima" Bologna, 1817. The same savant published another in 1819 on 

 the Jiilus fcetidissimus. 



f lulus ovalis, Li. ; Gronov., Zooph., pi. XVII, 4, 5 ; — Oniscits zonatus, Panz. 

 Fam. Insect. Germ., IX, xxiii; Glomeris inarginafa, Leach, Zool. Miscell., CXXXII ; 

 — Oi»niscus pvstulatits, Fah. ; Panz., lb., XXII, 



