13. COELENTERATA. The corals, sea anemones, 

 jellyfish, and hydroids. 



14. ECHINODERMATA. Star fish, sea urchins. 



15. MOLLUSCA. Commonly called shellfish. Il- 

 lustrated in our exhibit by the Chambered Nautilus, 

 the squids and octopus, oysters, clams, scallops, and 

 sea slug. 



16. ARTHROPODA. This great group, having exo- 

 skeletons, jointed bodies and legs, is represented by 

 examples of insects, such as flies, butterflies, moths, 

 seventeen-year locust, and beetles; the Arachnids — 

 spiders and scorpions; the Crustacea — lobsters, 

 crabs and crayfish. 



17. CHORDATA. Creatures having a dorsally- 

 located central nervous system (principally verte- 

 brates) . Fish, amphibians, reptiles, birds, and mam- 

 mals (including man) are classes or major subdivi- 

 sions under Chordata. 



The exhibit includes an outstanding collection of 

 skeletons comparing the structures of fish, amphib- 

 ians, reptiles, birds and mammals. There is also an 

 exhibit comparing the skeleton of a horse to that of 

 a man and suggesting that all mammals have essen- 

 tially the same bones but that the individual bones 

 are modified to fit special requirements. 



At the end of this hall is an exhibit of mounted 

 fish, both fresh water and marine. 



in. FROM WATER TO LAND 



Hall of ReptUes and Amphibians 



Located off the northwest corner of the Main Hall. 

 Two interesting groups of vertebrates are displayed 

 here. 



10 



