112 
M0BERK SYSTEM. 
b. External antenna with seven joints. 
Genus 36. PORCELLTO. Latr., Leach. 
External antenna inserted on a prominence under the anterior margin 
of the head : tail with its lateral styles conic, prominulous. 
Sp. 1. Por.scaber. Body rough. 
Oniscus Asellus. Fabr.Supp. Ent. Syst. 300. Porcellio scaber. Latr. 
Gen. Crust, el Insect, i. 70 Leach, Edin . Ennjcl. vii. 406.— Trans. 
Linn. Soc. xi. 37. — Supp. to Friend. Brit. i. 429. 
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- 
ish black, at another time yellow. In Scotland it is called Sclater. 
** Bodi/ contracted into a ball. 
Genus 37. ARMADILLO. Latr,, Leach. 
External antennal seven-jointed, inserted on a prominence in a cavity 
on each side of the head : tail with the lateral styles not prominent. 
Sp. 1. Arm. vulgaris. Griseous lead-coloured; hinder margins ot the 
segments whitish. 
Oniscus Armadillo. ' Linn . Syst. Nat. i. 1062. Armadillo vulgaris- 
Latr. Got. Crust, el Insect, i. 70. — Leach, Edin. Enci/cl. vii. 406.— 
Trans. Linn. Soc. xi. 376.— Supp. to Encyd. Brit. i. 429. 
Inhabits Europe amongst moss and under stones. It is commonly 
named the Pill-millepede, and paves the way to the Myriapoda : in ge- 
neral external appearance and in economy it is allied to the genus 
Clomcris. 
Class II. MYRIAPODA. 
This Class was proposed by Dr. Leach in the Edinburgh Encyelopa- 
dia, vo! . vii. and has since been distinctly established, with its characters 
more decidedly shown, in a paper published in the eleventh volume M 
the Transactions of the Liimean Society, and also in the Supplement to 
Encyclopadiu Rr.tannku, vol.i. 
By Linne the animals composing this group were denominated Sco- 
T.OPKNim.E and Jtn.r, and were arranged with apterous insects. Hi* 
pupil J. C. Fabricius, in the Supplement to his Entomobgia Systems 
tic a placed them in a particular Class named Mitosata, comprehend- 
ine all the species, like Linne, uuder the generic appellations ol JuluS 
and Scoeopf.nhf a . Cuvier, in hi* Tableau Etemcntaerc, arranged the 
Mi/mpoda with insects, in which he was followed by Dumeril, who ha»> 
however, adopted the new Genera proposed by Latreille. 
They were arranged in the older works of_ Latreille along with In- 
sects; hut in his lastwork he has placed them in a peculiar Order ol 1 i® 
Class Ahacbnoihea, which he had denominated Myriapoda ; and 
divided them into two Families. 
