228 APPENDIX 



Order 3. Orthoptera. Insects with two pairs of wings (the first pair being 

 usually parchment-like), biting mouth parts, and incomplete metamorphosis. 

 Ex. Grasshopper. 



Order 4. Neuroptera. Insects with two pairs of net- veined wings, biting 

 mouth parts, and complete metamorphosis. Ex. Ant lion. 



Order 5. Coleoptera. Beetles. Insects with two pairs of wings (of which 

 the first pair are elytra), biting mouth parts, and complete metamorphosis. 

 Ex. Potato beetle. 



Order 6. Hemiptera. Bugs. Insects with two pairs of wings, or wingless, 

 with sucking mouth parts in form of a jomted proboscis, and incomplete 

 metamorphosis. Ex. Aphis. 



Order 7. Lepidoptera. Butterflies and moths. Insects with two pairs of 

 scale-covered wings, with biting or sucking mouth parts in form of a long, 

 unjoin ted proboscis, and complete metamorphosis. Ex. Bombyx. 



Order 8. Diptera. Insects with one pair of wings, sucking mouth parts, 

 and complete metamorphosis. Ex. House fly. 



Order 9. Hymenoptera. Insects with two pairs of wings, biting and 

 Ucking mouth parts, and complete metamorphosis. Ex. Bee. 



PHYLUM VII. MOLLUSCA 



Animals without paired locomotory appendages and with a soft, unseg- 

 mented body which is usually inclosed in a calcareous shell. 



Class I. Amphineura. Symmetrical mollusks without a shell or with 

 one composed of eight pieces in a longitudinal row. Ex. Chiton. 



Class 2. Scaphopoda, Symmetrical mollusks with a cylindrical shell. 

 Ex. Dentalium. 



Class 3. Gastropoda. Snails. Mollusks with an asymmetrical, spiral 

 shell and a single mantle cavity. 



Order i. Opisthobranchiata. Marine snails with posterior gills. Ex. 

 .^olis. 



Order 2. Pulmonata. Fresh-water and land snails, without gills but with 

 lungs. Ex. Helix. 



Order 3. Prosobranchiata. Mostly marine snails with anterior gills. 

 Ex. Fulgur. 



Class 4. Pelecypoda. Symmetrical mollusks with a bivalve shell and 

 paired mantle cavities. Ex. Unio. 



Class 5. Cephalopoda. Mollusks with a large head, which bears a num- 

 ber of long arms, and with a single mantle cavity. 



Order i. Tetrabranchiata. Cephalopods with four gills and a large 

 convoluted shell. Ex. Nautilus. 



Order 2. Dibranchiata. Cephalopods with two gills and either eight or. 

 ten arms ; shell when pr<;*ent^ concealed in the mantle. Ex. LoUgo. 



