APPENDIX 



A SYNOPSIS OF THE CLASSIFICATION OF ANIMALS 

 PHYLUM I. PROTOZOA 

 Single-celled animals, aquatic and microscopic. 



Class I. Sarcodina. Protozoans with more or less protractile pseu- 

 dopodia. 



Order i. Rhizopoda. Pseudopodia without axial filament and usually 

 very retractile. Ex. Amoeba, 



Order 2. Heliozoa. Fresh-water Sarcodina with siliceous skeleton and 

 raylike pseudopodia, each with an axial filament. Ex. Actinospherium. 



Order 3. Radiolaria. Marine Sarcodina with siUceous skeleton. Ex. 

 Polycystina. 



Class 2. Mastigophora (Flagellata). Protozoans with one or more vibra- 

 tile 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 i. Ciliata. Ciliate infusorians. Ex. Paramecium. 



Order 2. Suctoria. Infusorians with sucking tentacles. Ex. Acineta. 



PHYLUM II. 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 siliceous spicules and either with or without spongin 

 fibers. 



Class 1. Calcarea. Sponges with calcareous spicules and of simple struc- 

 ture. Ex. Grantia. 



Class 2. Hexactinellida. Glass sponges with six-rayed siliceous spicules. 

 Ex. Euplectella. 



Class 3. Demospongiae. Massive sponges with either siliceous spicules 

 or spongin fibers or both. Ex. Spongilla. 



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