TAXONOMY 



271 



PHYLUM XI. 



Class IV. Amphibia 

 Order 1. Apoda 

 Order 2. Caudata 

 Order 3. Salientia 

 Class V. Reptilia 



Order 1. Testudinata 

 Order 2. Rhynchocephalia 

 Order 3. Crocodilini 

 Order 4. Squamata 

 Class VI. Aves 

 Subclass I. Arck^ornithes 

 Subclass II. Neornithes 



Hesperornithiformes 

 Ichthyornithiformes 

 Struth ionif ormes 

 Rheiformes 

 Casuariiformes 

 6. Crypturiformes 

 Dinornithif ormes 

 ^^pyornithif ormes 

 Apterygif ormes 

 Order 10. Spheniscif ormes 

 Order 11. Colymbiformes 

 Order 12. Procellariiformes 

 Order 13. Ciconiiformes 

 Order 14. Anserifornies 

 Order 15. Falconif ormes 

 Order 16. Gallif ormes 

 Order 17. Gruiformes 

 Order 18. Charadriiformes 



CHORDATA (Continued) 



Order 19. Cuculif ormes 

 Order 20. Coraciiformes 

 Order 21. Passerif ormes 

 Class VII. Mammalia 



Subclass I. Prototheria 

 Order 1. Monotremata 



Subclass II. Eutheria 

 Division I. Didelphia 



Order 1. Marsupialia 

 Division II. Monodelphia 

 Section A . Unguiculata 

 Order 1. Insectivora 

 Order 2. Dermoptera 

 Order 3. Chiroptera 

 Order 4. Carnivora 

 Order 5. Ilodentia 

 Order 6. Edentata 

 Order 7. Pholidota 

 Order 8. Tubulidentata 

 Section B. Primates 

 Order 9. Primates 

 Section C. Ungulata 

 Order 10. Artiodactyla 

 Order 11. Perissodactyla 

 Order 12. ProV)oscidea 

 Order 13. Sirenia 

 Order 14. Hyracoidea 

 Section D. Ceiacea 

 Order 15. Odontoceti 

 Order 16. Mystacoceti 



BRIEF CHARACTERIZATIONS OF THE MAJOR GROUPS OF ANIMALS 



The principal groups of animals are given below with brief diagnoses 

 which may serve as definitions. It must be understood that the charac- 

 ters given will often not be sufficient to distinguish all the forms in a 

 group, for there is much variation within the groups. They are intended 

 to give the student a general conception of the phyla, subphyla and 

 classes. 



Phylum PROTOZOA. Single celled animals without true organs or true tissues. 

 If colonial, the cells are all potentially alike. 



Class RHIZOPODA. Protozoa with changeable protoplasmic processes (pseudo- 

 podia). Amoeba. (Figs. 17, 26, 28.) 



Class MASTIGOPHORA. Protozoa with one or more vibratile processes (flagella) 

 which serve for locomotion and for taking food. Euglena. (Figs. 31, 53, 54, 55.) 



Class SPOROZOA. Parasitic Protozoa, usually without motile organs or mouth, 

 reproducing by spores. (Figs. 132, 137.) 



Class INFUSORIA. Protozoa having numerous slender vibratile processes (cilia), 

 a cuticle, and fixed openings for the ingestion of food and the extrusion of indigestible 

 matter. Paramecium. (Figs. 18, 33, 130, 131, 138.) 



