18 



A CLASSIFICATION OF THE INVERTEBRATA. 

 (PRINCIPAL PHYLA AND CLASSES.) 



Phylum Protozoa. S f , ( Class Proteomyxa. 



Mycetozoa (Fungus Animals). 

 Lobosa (Amoeba, etc.). 

 Heliozoa (Sun Animalcules). 

 Foraminifera. 

 Radiolaria. 



Flagellata or Mastigophora. 



Ciliata. 



Acinetaria. 



Sporozoa (Gregarines). 



Calcarea (Limy). 

 Hexactinellidae (Siliceous). 

 Demospongite (Silica and 

 Spongin). 



Hydrozoa (Hydra. Hydrc.id.s, 

 and Jelly-fish.T. 



Actinozoa(^lcyonium, Sea 

 Anemones, Corals). 



Ctenophora (Cydippe, 

 ( Vstum). 



f Phylum Porifera (Sponges). 



Phylum Ccelenterata. 



Phylum Piatyhelmintbes 



(Flat Worms). 

 Phylum Nematoda (Round 



Worms). 



Phylum Annelida (Segmented 

 Worms). 



Phylum Arthropoda. 



I hylum Echinodermata. 



Phylum Mollusca. 



Trematoda (Flukes). 

 Cestoda (Tapeworms). 



with 



Chtetopoda (Worms 



bristles or Chtetae). 

 Hirudinea or Discophora 



(Leeches). 



( Vustac^:i(Crayfi8h, Crab, etc). 

 Protptracheata (Peripatus). 

 Myriapoda (Centipedes and 



'Millipedes). 



Insecta ( In - 



A rachnida (Scorpions, Spiders, 



Mites. Ticks, etc.). 



Asteruidea (Slnrtishes). 

 Echinoidr.-i (Se;i-Urchins). 

 Holothuroide 

 Cucumbfi 



Gasteropoda (Snails, Slugs, 



etc.). 

 Lamellibranchiata or Pelecy- 



poda (Bivalves). 

 Cephalopoda (Cuttlefishes). 



