CLASS I. CRUSTACEA. Ill 



Fam. IX. LiGiAD.E. Leach's MSS. 



Interior antennae distinct. Sti/le of the tail double, with double foot- 

 stalks. 



Genus 33. LIGIA. Fair., Lafr., Bosc, Leach. 

 Kiternal a«^e««(£ with the last joint composed of several other joints. 



Sp. 1. Lig. oceanica. Antenna; as long as the body : l)ack subscabrose. 

 Ligia oceanica. Fabr. Siipp. Ent. S^st. 301. Leach, EJin. Fncycl. vii. 406. 



— Supp. to Enci/cl. Brit. i. 428. Ligia Scopulorum. Leach, Edin. En- 



cycl. vii. 400. Oniscusoceanicus. Linn. Syst. Kat. i. 1061. 

 Inhabits the rocky shores of the 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. Oxiscin.?;. 



Antenne two. St i/Ics of the tail four, the lateral ones biarticulate. 



* Bodj/ not capable of contracting into a hall. 

 a. External antenna eight-jointed. 



Genus 34. PHTLOSCIA. Latr., Uach. 

 External antcnnce with their bases naked : tail abruptly narrower than 



the body. 

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

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



Ent. St/st.W.S97. Philoscia Muscorum. Latr. Gen. Crust, et Lisect. 



i. 69. Leach, Edin. Encycl. vii. 406. — Supp. to Euci/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.Aselhts. Above, obscure-cinereous, rough; the sides and a se- 

 ries of dorsal spots yellowish. 



Oniscus Asellus. Li uni:, Latr., Leach. Oniscus murarius. Fabr. Supp. 

 Ent. Si/st. 300. 



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

 rope. 



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

 consumptions, &:c. but has now, like many other medicines, descr\'- 

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

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

 or Carpenter. 



