112 MUl'ERN SySl'EM. 



b, External anlennm with seven jointi. 



Genus 36. PORCELLIO. Latr., Leach. 

 External antcnme inserted on a prominence luider the anterior margin 



of tlie head : tail with its lateral styles conic, prominulous. 

 Sp. 1. Por.scaber. Body rough. 

 Oniscus Asellus. Fubr. Supp. Ent. Si/st. 300. Porcellio scaber. Lat7\ 



Gen. Crust, et Insect, i. 70 Leach, Edin. Encycl. vii. 406. — Trans. 



Linn. Soc. xi. 37. — Supp. to Enci/cf. Brit. i. 1'29. 

 Inhabits Europe. This species is found under stones, in rotten wood, 



and on old walls. It varies much in colour, beinii: at one lime blue- 



ish black, at another time yellow. In Scotland it is called Sclater. 



** Body contracted info a hall. 



Genus 37. ARMADILLO. Lutr., Leach. 



Erternal antenna seven-jointed, inserted on a prominence in a cavity 

 on each side of the head: /«('/ with the laLeral styles not prominent. 



Sp. 1. Ai-m. vulgaris. Griseous lead-coloured; hinder margins of the 

 segments whitish. 



Oniscus Armadillo. iLinn. Syst. Kat. i. 10G2. Armadillo vulgaris^ 

 I^ifr. Gen. Crust, et Insect, i. 70. — Leach, Edin. Encycl. vii. 406. — 

 Trans. Linn. Soc. xi. 376.—^Supp. to Encycl. Brit. i. 429. 



Inhabits Europe amongst moss and under stones. It is commonly 

 named the Pill-millepede, and pavas the way to the Myriapoda : in ge- 

 neral external appearance and in economy it is allied to the genus 

 Glomcris. 



Class U. MYRIAPODA. 



This Class was proposed by Dr. Leach in the Edinburf^h Encyclopa^ 

 A'fljVol. vii. and has since been distinctly established, with its characters 

 more decidedly shown, in a paper published in the eleventh vohuxie of 

 the Transactions of the IJnneun Society, and also in the Supplement to 

 Encyclopmlia Br tannici, vol. i. 



By Linne the animals composing this group were denominated Sco- 

 ■LOPF.NDR.T. and JuLi, and were arranged with apterous insects. His 

 pujiil, J. C. Fabricius, in the Supplement to his Entomologia Systcma^ 

 tica, placed them in a particular Class named Mitosata, comj-,rehend- 

 ingall the species, like Linne, under the generic appellations of Julus 

 and ScoioprxDRA. Cuvier, in his Tableau Elementaire, arranged tlie 

 Myriapoda whh insects, in which he was followed by Dunieril, who has, 

 however, adopted the new (Jcnera proposed by Latreille. 



They were arranged in the older works of Latreille along with In- 

 sects; i)ut in his last work be has placed them in a peculiar Order of the 

 Class AitAcnNoiDKA,which be had dcnuniiualed MYKiArou^; and has 

 divided them into two Families. 



