APPENDIX 
A SYNOPSIS OF THE CLASSIFICATION OF ANIMALS 
PHYLUM I. PROTOZOA 
Single-celled animals, aquatic and microscopic. 
Class 1. Sarcodina. Protozoans with more or less protractile pseu- 
dopodia. 
Order 1. Rhizopoda. Pseudopodia without axial filament and 
usually very retractile. Ex. Amoeba. 
Order 2. Heliozoa. Freshwater Sarcodina with silicious skeleton 
and ray-like pseudopodia, each with an axial filament. Ex. Actino- 
spherium. 
Order 3. Radiolaria. Marine Sarcodina with silicious skeleton. 
Ex. Polycystina. 
Class 2. Mastigophora (Flagellata). Protozoans with one or more 
vibratile flagella. Ex. Euglena. 
Class 3. Sporozoa. Protozoans which are internal parasites and 
have no locomotory organs as adults. Ex. Gregarina. 
Class 4. Infusoria. Protozoans with cilia or sucking tentacles. 
Order 1. Ciliata. Ciliate infusorians. Ex. Paramecium. 
Order 2. Suctoria. Infusorians with sucking tentacles. Ex. Acineta. 
PHYLUM II. COELENTERATA 
Radiate animals with a single, but sometimes branched, internal 
cavity and no celom. 
Suppuytum I. Spongiaria (Porifera). Sessile, mostly colonial 
animals without specialized organs or tissues; body-wall pierced by 
numerous pores or canals and usually stiffened by either calcareous 
or silicious spicules and either with or without spongin fibers. 
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