248 ANIMAL FORMS 
Class II, Trématd'da (trematodes, pierced with holes, from the 
erroneous belief that the suckers are holes into the body). 
Liver fluke, Lpidél'la. 
Class III. Céstd'da (cestos, a girdle; edos, likeness). 
Tapeworm. 
Branch V, NEMATELMINTHES (nema, thread ; helminthos, a 
worm) 
Class I. Nématd'da, 
Vinegar eel (Anguillula), 77%chi'na, horsehair snake (Gordius). 
Brancn VI. NEMERTIN'EA (nemertes, a sea-~nymph) 
Branco VII. ROTIF’'BRA (rota,.a wheel; fero, to carry) 
Brancu VII. ANNEL'IDA (annelus, a ring) 
Class I. Cheetdp'oda (chaite, bristle; pous, foot). 
Order 1. Polyche’te (polus, many; chatte, bristle). 
Ner'eis, Polyno'e, Sér'pula, Sadél'la. 
Order 2. Oligéche'te (oligos, few; chaite, bristle). 
Earthworm (Liim'bricus). 
Class II. Hirudin'ea (Airudo, a leech). 
Leeches. 
Class III. G&phyrea (gephura, a bridge, because these animals were 
once supposed to bridge the gap between the worms and sea- 
cucumbers).. 
Branca IX. MOLLUSCOI'DA 
Class I. Pélyzé'a (polus, many; zoon, animal—colonial animals), 
Polyzoa, sea-mats. 
Class II. Brachidp’oda (brachion, arm; pous, foot). 
Lamp-shells (brachiopods). 
Branca X. MOLLUS'CA (mollis, soft) 
Class I. La&méllibranchia'ta (lamella, a plate; branchia, gill), 
Clams, mussels, oysters, ship-worm (Teré'do). 
Class IT. Gastrdp’oda (gaster, stomach; pous, foot). 
Snails, slugs, armadillo snails, naked snails, nudibranchs. 
Class III. C&éphaldp'oda (cephale, head; yous, foot). 
Squids, cuttlefishes, devil-fishes (Oc'tépus), nautilus. 
Branch XI, ECHINODER'MATA (echinos, a hedgehog; derma, 
skin) 
Class I. Asteroi’dea (aster, star; eidos, likeness), 
Starfishes, 
