CLASS I. CRUSTACEA. Ill 



Fam. IX. Lir.iAD.T.. Leach's MSS. 



Inferior antenna distinct. Sl^le of the tail double, \\[\h double foot- 

 stalks. 



Genus 3.3. LIGIA. Fahr., TMfr., Bmc, Uach. 

 EatcnuU antenntewhh the last joint composed of several other joints. 



Sp. 1. Lig. oceanica. Antennae as long as the body : back subscabrose. 

 Ligia oceanica. Fair. Supp. Ent. Si/st. 301. Leach, FxUn. Enci/cl.v'u. 406. 



— Supp. to EiuycL Bril. i. 123. Ligia Scopulorinn. ]A:ach, Ediu. Eih- 



ctjcl. vii. 40G. Oniscusoceanicus. Linn. Sj/st. Aut. i. lOGl. 

 Inhabits the rocJcy shores of tlie European ocean. The last joint of 



the antenna varies much in the number of its segments, even in the 



two sides of the same individual. 



Fam. X. O.NtsciD.E. 



A)itenv<e two. St i/lcs of t\\c tail four, the lateral ones biarticulate. 



* Boilj/ not capable of contracting into a ball, 

 a. External antenna: eight-jointed. 



Genus 31. PIIILOSCIA. Latr., Leach. 

 External antenna with their bases naked : tail abruptly narrower than 



the body. 

 Sp. 1. Phil. Muscoruin. Body variegated ; sometimes pale brick-red. 

 Oniscus Muscorum. Scop. Ent. Ctirn. 1145. Oniscus sylvestris. Fabr. 



Ent. Sj/st. iv. 397. Philoscia Musconmi. lAdr. Gen. Crust, et Liscct. 



i. 69. JxY/c/(, Edin. Enct/cl. vii. 406. — Supp. to Enct/cl. Brit. i. 428. 

 Inhabits France, Germany, and England, under stones and mosses. 



Genus 35. ONISCUS of authors. 



Antenna inserted beneath the anterior margin of the head, on a promi- 

 nent part. 



Sp. 1. On. Asellus. Above, obscure-cinereous, rough; the sides and a se- 

 ries of dorsal spots yellowish. 



Oniscus Asellus. Li/tnc, Latr., Leach. Oniscus murarius. Fabr. Supp. 

 Ent. S)/st. 300. 



Inhabits rotten wood and old walls throughout the greater part of Eu- 

 rope. 



It was formerly used in medicine, and was supposed to cure agues, 

 consumptions, &c. but has now, like many other medicines, deser\- 

 edly grown out of fashion, and is rejected from the modern Pharma- 

 copoeias. It is commonly called Pig's-lousc, Wood-louse, Millepede 

 or Carpenter. 



