248 ANIMAL FORMS 



Class II. TrematS 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; helminUios. a 



worm) 

 Class I. Nemato da. 



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



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

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



BRANCH VIII. ANNE L IDA (annelus, a ring) 

 Class I. Chaetop oda (cltaiie. bristle; pous, foot). 

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



Ner'eis, Polyno'e, Ser'pula, Sabella. 

 Order 2. Oligochae te (oligos,few; cJi a ite, bristle). 



Earthworm (Lum'bricus). 

 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. MOLLUSCOIDA 

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



Polyzoa, sea-mats. 

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



Lamp-shells (brachiopods). 



BRANCH X. MOLLUS CA (mollin, soft) 

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



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

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



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

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



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



BRANCH XI. EOHINODER MAT A (echinos, a hedgehog; derma, 



skin) 



Class I. Asteroidea (aster, star; eidos, likeness). 

 'Starfishes. 



