348 The Animal Kingdom 



Coelomate animals. 



Phylum Annelida. Segmented worms, usually with appendages on 

 most segments. Examples : sand worm, earthworms. 



Phylum Echiuroidea. Mouth ventral, with noneversible proboscis. 

 Example : Echiurus sp. 



Phylum Sipunculoidea. Wormlike forms with dorsal anus and 

 eversible proboscis. Example, sipunculids, peanut worms. 



Phylum Mollusca. Animals with mantle which secretes shell ; 

 mantel surrounds visceral mass, with reduced coelom. Ex- 

 amples : clams, octopuses, squids, snails. 



Phylum Bryozoa or Polyzoa. Colonial animals, with looped in- 

 testine having anus near mouth, coiled ridge with ciliated ten- 

 tacles (the lophophore) present. Example: moss animals. 



Phylum Brachiopoda. With bivalve shell having lophophore and 

 looped intestine. Example : lamp shells. 



Phylum Phoronida. Wormlike forms having lophophore and looped 

 intestine. Example : phoronids. 



Phylum Arthropoda. Segmented animals with jointed appendages 

 and chitinized exoskeleton. Examples : insects, arachnids, crus- 

 taceans, etc. 



Phylum Echinodermata. Adults with secondarily acquired radial 

 symmetry, endoskeleton formed of plates, with water vascular 

 system. Examples : starfishes, sea urchins. 



Phylum Chaetognatha. Transparent wormlike animals with pointed 

 anterior end. Example : arrow worms. 



Phylum Enteropneusta or Hemichordata. Animals possessing 

 pharyngeal gill slits; notochord (if present) reduced to small rod 

 in anterior end, some with dorsal tubular nervous system, with 

 proboscis. Example : tongue worms. 



Phylum Chordata. Animals with dorsal notochord, dorsal tubular 

 nervous system, pharyngeal gill slits. Examples : frogs, fishes, 

 mammals, etc. 



