VI 



CONTENTS. 



Study V. ECHINODERMATA. SPINY-SKINNED AnIMALS . 



1. The Starfish 



2. The Sea-urchin 



3. The Sea-cucumber 



4. The Development of an Echinoderm 



Study VI. Arthropoda. Joint-footed Animals 



1. The Crayfish 



2. The Crab 



3. The Pill-bug 



4. The Fairy Shrimp. Branchipus . 



5. The Locust. "Grasshopper" 



6. The Metamorphosis of a Moth. " Cecropia " 



7. The Metamorphosis of a Mosquito 



8. An Exercise in Identification and Classification 



9. A Comparative Revievr of the Arthropoda . 



Study VII. MoLLnscA. Soft-bodied Animals . 



1. The Eresh-water Clam . . . . 



2. The Snail 



3. The Squid 



Study VIII. Verteeeata. Backboned Animals 



1. The Goldfish and Perch 



2. The Frog .... 



3. Tadpoles, a Study of Vertebrate Metamorphi 



4. A Study of a Bird Skin 



5. Vertebrate Exoskeletons 



6. A Comparative Study of Living Vertebrates 



7. A Zoological Study of Man . 



8. A Comparative Review of Important Types 



A Table of Classification 



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