48 INTRODUCTION. 



Order 7. Phyllopoda. Ex. Brine-shrimp (Artemia). 



Order 8. Trilobita (Extinct). 



Order 9. Merostomata. Ex. King-crabs (Limulus). 



Order IO. Ltcmodipoda. Ex. Whale-louse (Cyamus). 



Order n. Isopoda. Ex. Wood-lice (Oniscus), Slaters (Ligia). 



Order 12. Amphipoda. Ex. Sandhopper (Talitrus), Fresh-water 



Shrimp (Gammarus). 



Order 13. Stomapoda. Ex. Locust-shrimp (Squilla). 

 Order 14. Decapoda. Ex. Lobster (Homarus), Cray-fish (Astacus), 

 Shrimps (Crangon) ; Hermit-crabs (Pagurus) ; Crabs 

 (Cancer, Carcinus), Land-crabs (Gecarcinus). 



CLASS II. ARACHNIDA. Respiration aerial, by pulmonary chambers or 

 air-tubes (tracheae) in the higher forms. Antennae converted into jaws. 

 Head and thorax amalgamated. Four pairs of legs. Abdomen without 

 limbs. 



Order I. Podosomata (Sea-spiders). Ex. Pycnogonum. 



Order 2. Monomerosomata. Ex. Mites (Acarus), Water-mites (Hy- 



drachna), Ticks (Ixodes). 

 Order 3. Adelartkrosomata. Ex. Harvest-spiders (Phalangidae), 



Book-scorpions (Chelifer). 



Order 4. Pfdipalpi. Ex. Scorpions (Scorpio). 

 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 simi- 

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

 upon the abdomen. One pair of antennae. 



Order I. Chilopoda.Ex. Centipedes (Scolopendra). 

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

 Order 3. Pauropoda. Ex. Pauropus. 



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 I. Anoplura.Ex. Lice (Pediculus). 



Order 2. Mallophaga (Bird-lice). 



Order 3. Thysanura (Springtails). 



Order 4. Hemiptera.Ex. Plant-lice (Aphides), Field-bug (Pen- 



tatoma), Cochineal Insects (Coccus). 

 Order 5. Orthoptera. Ex. Locusts (Acrydium), Grass-hoppers 



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

 Order 6. Neuropttra. Ex. White Ants (Termes), Dragon-flies 



(Libellulidae), May-flies (Ephemerida;). 

 Order 7. Aphaniptera. Ex. Fleas (Pulex). 

 Order 8. Diptera.Ex. Gnats (Culex), Crane-flies (Tipula), 



House-flies and Flesh-flies (Musca). 

 Order 9. Lepidoptera (Butterflies and Moths). 

 Order 10. Hymenoptera. Ex. Bees (Apidae), Humble-bees (Bom- 

 bidae), Wasps (Vespidae), Ants (Formicida), Saw-flies, 

 (Tenthredinidae). 



Order II. Strepsiptcra.Ex. Stylops. 

 Order 12. Coleoptera (Beetles). 



SUB-KINGDOM V.MOLL USCA. 

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



