3(J4 APPENDIX. 



and abdomen distinct. Tliree pairs of legs in adult, borne on tliorax; 

 no limbs on abdomen. Orders 13: 1. Anoplura. Ex.: Lice (Pe- 

 die\dus).— 2. Mallopliaga. Ex. : Bird-lice. — 3. CoUembola. Ex. : 

 Spring-tails. — 4. Thysanura. Ex. : Lepisma. — 5. Hemiptera. Ex. : 

 Plant-lice (Aphides), Boat-fly (Nepa), Cochineal, Cicada. — 6. Orthop- 

 tera. Ex. : Crickets (Achetina), Grasshopper (Gryllus), Locust (Acrj-- 

 dium), Cockroach (Blatta). — 7. Neuroptera. Ex. : Dragon-flies (Libel- 

 luIid.T?), May-flies (Ephemera), White Ants (Termites). — 8. Aphanip- 

 tera. Ex. : Fleas (Pulex).— 9. Diptera. Ex. : House-fly (Musca). 

 Gnats and Mosquitoes (Culicida3). — 10. Lepidoptera (Butterflies and 

 moths). — 11. Hymenoptera. Ex. : Bees (Apids), Wasps (Vespidoe), 

 Ants (Formicida^), Gall-tlies (Cynipidas), Saw-flies, Ichneumon, etc. — 

 13. Strepsiptera. Ex. : Stylops. — 13. Coleoptera (Beetles). Pago 

 100. 



S UB-KIN6D Oil v.- MOLL USCA . 



Soft-bodied animals, usually protected by a shell. Distinct aliment- 

 ary canal ; distinct heart in higher forms. Nervous system consists 

 of a single ganglion or three scattered pairs of ganglia. Page 183. 



A. Molluscoida. — Nervous system a single ganglion or pair of 

 ganglia. Imperfect heart or none. Classes 3: 



I. Polyzoa. — Form compound growths. Ex.: Sea-mats (Flustra), 

 Lace-coral (Fenestella). Page 187. 



II. Tunicata. — Enclosed in a leathery case. Ex. : Sea-scjuirts 

 (Ascidia). Page 191. 



III. Brachiopoda. — Bivalves. Mouth furnished with fringed 

 " arms." Ex. : Lamp-shells (Terebratula). Page 193. 



B. Mollusca Proper. — Nervous system of three pairs of ganglia. 

 Heart of at least two chambers. Classes 4 : 



I. Lamellibrancliiata. — Gills leaf-like. Ex. : Oyster (Ostrea), 

 Scallop (Pecten), Mussel (Mytilus). Page 196. 



II. Gasteropoda. — Univalve, or shell wanting ; large foot on 

 under side of body. Ex. : Whelks (Buccinum), Land-snails (Plelix), 

 Slugs (Limax). Page 301. 



III. Pteropoda. — Wing-like appendages attached to head. Ex. : 

 Clcodora. Page 30<). 



IV. Cephalopoda. — Eight or more "arms " surrounding mouth. 

 Ex. : Calamaries (Loligo), Cuttle-fish (Octopus), Paper Nautilus (Ar- 

 gonauta). Pearly Nautilus (Nautilus). Page 208. 



SKCTION II.— VEKTEBKATE.?. 



S UB-KING'DOM ri.~ VERTEBRA TA . 



Body composed of two tidies, one containing the nervous axis, the 

 other I he digestive, cin-ulatory, and sympathetic systems. Skeleton 



