JIYRIAPODA. 349 



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

 these changes take place about once a month. In their exuviae, 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 



IULUS, Lin. 

 Which we divide as follows : 



Some have a crustaceous 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 the head, of but twelve 

 segments, the first and narrowest of which 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* 



IULUS, Lin. 



The body of the true lull is cylindrical and very long, and has no 

 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. maximum L.; Marcgr., Bras., p. 255. Peculiar to South 

 America, and is seven inches long. 



/. sabulossus, L.; Schaeff. Elem. Entom., Ixxiii; Lfasciatus, 

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

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



* See Ballet. Gt'nt'r. et Uuivers. of the Baron Ft'-russac, Decemb., 1823. The 

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

 in a memoir, intitltul " Osaervazioni per servire alia storia di una specie di Jnlus 

 communissima" Bologna, 1817. The same savant published another in 1 SI 9 on 

 the Julutfatidusiauu. 



f lulus ovalis, L. ; Gronov., Zooph., pi. XVII, 4, 5; Oniscus zonatvs. Pan*. 

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

 Oiisc\u pustulatus, Fab.; Panz., lb., XXII. 



