ONISCUS. 155 



them live on the earth, but some inhabit the 

 water. Of these the G. aquaticus is sometimes 

 seen, like a small shrimp, swimming in our 

 cisterns ; while the marine species, the O. En- 

 tomon, of comparative gigantic size, measuring 

 near two inches, is found about rocks, and 

 under the arches of bridges, &c. subject to the 

 tide. 



One of the kinds, though no longer in fashion, 

 was once the favourite of the physician, and 

 extolled for virtues which it never possessed. 

 The O. Armadillo, or Medical Wood-louse, 

 has a dark and polished surface, and when 

 rolled into a ball and dried, was administered 

 by the name of Millepede, with equal efficacy, 

 in many disorders. 



SPECIFICATION. 



Oniscus Asellus. O. ovalis, cauda obtusa, stylis 

 simplicibus. Linn. Syst. Nat. 1. p. 1061. Gmel. 1, 

 p. 3013. Fair. Spec. Ins. l.jp. 379. Mant. In$.l< 

 p. 242. Ent.Syst. 2. p. 397. 

 Degeer, Ins. 7, p. 54tf. t. 35./. 3. 



