CHIEF DIVISIONS OF THE ANIMAL KINGDOM. 85 



Order 5. Araneida. Ex. House-spiders (Tegenaria), Field-spiders 



(Epeira). 



CLASS III. MYRIAPODA. Respiration aerial, by tracheae (air-tubes) or 

 by the skin. Head distinct ; remainder of body composed of nearly 

 similar segments. Legs more than eight pairs in number, and borne 

 partly upon the abdomen. One pair of antennae. 



Order 1. Ghilopoda. Ex. Centipedes (Scolopendra). 

 Order 2. Chilognatha. Ex. Millipedes (lulus). 

 Order 3. Pauropoda. Ex. Pauropus. 

 Order 4. Onychophora. Ex. Peripatus. 



CLASS IV. INSECTA. Respiration aerial, by tracheae. Head, thorax, 

 and abdomen distinct. One pair of antennae. Three pairs of legs, and 

 generally two pairs of wings on the thorax. No locomotive limbs on the 

 abdomen. 



Order 1. Anoplura. Ex. Lice (Pediculus). 



Order 2. Mallophaga (Bird-lice). 



Order 3. Colkmbola.Ex. Podura. 



Order 4. Thysanura. Ex. Lepisma. 



Order 5. Hemiptera. Ex. Plant-lice (Aphides), Field-bug (Pen- 



tatoma), Cochineal Insects (Coccus). 

 Order 6. Orthoptera. Ex. Locusts (Acrydium), Grasshoppers 



(Gryllus), Crickets (Acheta), Cockroach (Blatta). 

 Order 7. Neuroptera. Ex. White Ants (Termes), Dragon-flies 



(Libellulidse), May-flies (Ephemeridse). 

 Order 8. Aphaniptera. Ex. Fleas (Pulex). 



Order 9. Diptera. Ex. Gnats (Culex), Crane-flies (Tipula), House- 

 flies and Flesh-flies (Musca). 

 Order 10. Lepidoptera (Butterflies and Moths). 

 Order 11. Hymenoptera. Ex. Bees (Apidae), Humble-bees (Bom- 

 bidae), Wasps (Vespidae), Ants (Formicidae), Saw- 

 flies (Tenthredinidae). 

 Order 12. Strepsiptera. Ex. Sty lops. 

 Order 13. Coleoptera (Beetles). 



SUB-KINGDOM V.MOLL USCA . 



Animal soft-bodied, generally with a hard covering or shell. Nervous 

 system consisting of a single ganglion or of scattered pairs of ganglia. A 

 distinct heart and breathing-organ, or neither. 



The Mollusca may be divided into the two following primary divisions, 

 containing the following classes : 



A. MOLLUSCOIDA. Nervous system consisting of a single ganglion or 

 of a principal pair of ganglia. No heart, or an imperfect one. 



CLASS I. POLYZOA. Animal always forming compound growths or 

 colonies. No heart. The mouth of each zooid surrounded 

 by a circle or crescent of ciliated tentacles. Ex. Sea- 

 mats (Flustra), Lace-coral (Fenestella). 



