112 MOIJErvN SYSTEM. 



b. JLxternal antenn(EwUh seven joints. 



Genus 36. PORCELLIO. Lafr., Leach. 

 External antemue inserted on a prominence inider the anterior margin 



of the head : tail with its lateral styles conic, proniinulous. 

 Sp. 1. For.scaber. Body rough. 

 Oniscus Asclkis. Fabr. Supp. Ent. S^st. 300. Porcellio scaber. Lafr. 



Gen. Crufit. et Insect, i. 70 Txac/i, Edin. Enci/cl. vii. 406. — Trans. 



Linn. Soc.xl 37.—Snpp. to Eiict/cL Brit. i. -i29. 

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



and on old walls. It varies much in colour, being at one time blue- 



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



** Bodi/ contracted into a hall. 



Genus 37. ARMADILLO. JmU:, Leach. 



External antcn'uc seven-jointed, inserted on a prominence in a cavity 

 on each side of the head : fail with the lateral styles not prominent. 



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

 segments wliitish. 



Oniscus Arniadillo. Linn. Sj/sf. Nat. i. 1062. Armadillo vulgaris. 

 Latr. Gen. Crust, et Insect, i. 70. — Txach, Edin. Enct/cl. vii. 406. — 

 Trans. Linn. Sac. xi. 370. — Supp. to Enct/cl. Brit. i. 429. 



Inhabits Europe amongst moss and under stones. It is commonly 

 named the Pili-millepedc, and paves the way to the Myriapoda : in ge- 

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

 Glomcris. 



Class II. MYRJAPODA. 



This Class was proposed by Dr. Leach in the Edinburgh Enci/clopa- 

 dia, yo\. vii. and has since been distinctly established, with its characters 

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

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

 Encycloptedia Br,tannica,\o\.\. 



Ji'y Linne the animals composing this group were denominated Sco- 

 LOPENDRJE and JuLi, and were arranged with apterous insects. His 

 pupil, J. C. Fabricius, in the Supplement to his Entomologia Systema- 

 tica, placed them in a particular Class named Mitos.\ta, comprehend- 

 i;i:^ all the species, like Linne, under the generic appellations of Julvs 

 and ScoLOPFNORA. Cuvier, in his Tableau Elemcnfairc, arranged the 

 Myriapoda with insects, in which he was fcjllowed by Dumeril, who has, 

 however, adopted the new Genera proposed by Latreille. _^ 



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

 sects; but in his last work he has placed them in a pecidiar Order of Uie 

 Class Arachnoidea, which he had denominated JMykiapoua ; and has 

 divided them into tvrvD Families. 



