on ARTICL'LATA. 



yellowisli-whito, beset witli lung rfinote luiirs. Inhabits cheese and old 

 Hour, in England. 



Hydrachna geographica. — The Geographical Hydraohna. Plate xvii. 

 fig. 2. Body glolnilar, black, with scarlet spots and dots. Inhabits slow, 

 running streams of Europe. 



CLASS VIII.— MYRIAPODA. 



Head distinct and provided with two antennae ; body divided into seg- 

 ments ; mandibles simple, incisive, most of which are provided with feet. 

 It contains two orders. 



ORDER I. CHILOGNATHA. 



Antennae seven-jointed and tiliform ; mouth composed of two mandibles 

 and a lip divided by sutures; with two or four anterior feet united at their 

 base, resembling pedipalpi; and having distinct spiracles- This order con. 

 tains five genera. 



Julus subtdosus.— The Subular Julus or Gaily Worm. Plate Isvii. fig. 3 

 Described, vol. iv. page 240. 



Polyxenus rfcctrica.— The Electric Polyxenus. Plate Ixvii. fig. 4. Dusky- 

 brown, with yellowish legs, these are about seventy on each side. Inhabits 

 damp situations in Europe. 



ORDER II. — CHILOPODA. 



Antennae setaceous, many -jointed ; mouth consisting of two mandible<< 

 and a small palpiform appendage ; labium with many clefts, and two large 

 palpi ; two hook-formed feet, pierced at the tips for the emission ot a 

 poisonous fluid; body with a coriaceous or membranous covering; and 

 each segment with two f--«t ; having distinct spiracles. This order contains 

 i5ve genera. 



Scohpendra morsitans. — Tlie Deadly Scolopendra. Plate Ixvii. fig. 5. 

 Body brown ; provided with forty-two feet, the last two with a spinous 

 tirstjoint. Inhabits India. 



CLASS IX.— INSECTS. 



Articulated animals with six legs, and respiring by means of tracheae ; 

 head distinct from the thorax, and provided with two antennae. 

 For a general account of this class, see vol. iv. page 192. 

 Latreille divides insects into eleven orders. 



ORDER I. THYSAKOURA. 



Apterous insects with six feet, and not undergoing any transformation ; 

 head distinct ; two autennte, which are longer than the head ; abdomen 

 terminated by filaments ou a forked tail. This order contains four genera. 



LapUma saccharina.— The Saccharine Lapisma, or Wood Fish. Silvery, 

 gray ; body gradually tapering to the tail, which terminates in three long 

 serrated bristles. Inhabits Europe and Jamaica, and destroys books. 



