248 ANIMAL FORMS 



Class II. Tremato da (trematodes, pierced with holes, from the 

 erroneous belief that the suckers are holes into the body). 



Liver fluke, Epidel'la. 

 Class III. Cesto'da (cestos, a girdle ; eidos, likeness). 



Tapeworm. 



BRANCH V. NEMATELMINTHES (nema, thread; helminthos, a 



worm) 

 Class I. Nemato'da. 



Vinegar eel (Anguillula), Trichl'na, horsehair snake (Gordius). 



BRANCH VI. NEMERTIN E A (nemertes, a sea-nymph) 

 BRANCH VII. ROTIF ERA (rota, a wheel; fero, to carry) 



BRANCH VIII. ANNELIDA (annelus, a ring) 

 Class I. Cheet5poda (chaite, bristle; pous, foot). 

 Order 1. Polychae'te (polus, many ; chaite, bristle). 



Ner'eis, Poly no' e, Ser'pula, Sabel'la. 

 Order 2. Oligochae te (oligos, few ; chaite, bristle). 



Earthworm (Lum'lricus). 

 Class II. Hirudin'ea (hirudo, a leech). 



Leeches. 



Class III. Gephyrea (gephura, a bridge, because these animals were 

 once supposed to bridge the gap between the worms and sea- 

 cucumbers). 



BRANCH IX. MOLLUSCOI DA 



Class I. Pblyzo'a (polus, many ; zoon, animal colonial animals). 



Polyzoa, sea-mats. 

 Class II. Brachiop'oda (brachion, arm ; pous, foot). 



Lamp-shells (brachiopods). 



BRANCH X. MOLLUS'CA (mollis, soft) 

 Class I. Lamellibranchia'ta (lamella, a plate ; branchia, gill). 



Clams, mussels, oysters, ship-worm (Tere'dd). 

 Class II. Gastrbp'oda (gaster, stomach ; pous, foot). 



Snails, slugs, armadillo snails, naked snails, nudibranchs. 

 Class III. Cephalbp'oda (cephale, head ; pous, foot). 



Squids, cuttlefishes, devil-fishes (Oc'topus), nautilus. 



BRANCH XI. ECHINODER'MATA (echinos, a hedgehog; derma, 



skin) 



Class I. Asteroi'dea (aster, star; eidos, likeness). 

 Starfishes. 



