CLASSIFICATION OF ANIMALS 249 



Class II. Ophiuroi'dea (ophis, serpent; oura, tail; eidos, likeness). 



Serpent- or brittle-stars, basket-stars. 



Class III. Holothuroi dea (holothurion, a kind of water polyp; 

 eidos, likeness). 



Sea-cucumbers. 

 Class IV. Crinoi dea (crinon, lily ; eidos, likeness). 



Sea-lilies or crinoids. 

 Class V. Echinoi dea (echinos, hedgehog; eidos, likeness). 



Sea-urchins. 



BRANCH XII. ARTHROP ODA (arthron, joint ; pous, foot) 

 Class I. Orusta'cea (crusta, a crust or shell). 



Fairy-shrimp (Brdnchip'us), water-fleas (DapJi 'nia), cop'epod, 

 Cy' clops, goose barnacle, acorn barnacle, Saccull'na, opossum- 

 shrimp, prawn, lobster, crayfish, cancer-crab, rock-crab, pill- 

 bug or i'sopod, sand-hopper or amphi'pod. 

 Class II. Onyc5ph'ora (onyx, claw ; pJiero, to carry). 



Pertp'atus). 

 Class III. Myriop oda (myrios, numberless; pous, foot). 



Cent'iped, thousand-legs. 



Class IV. Insec'ta (insectum, cut in, owing to the grooves surround- 

 ing the body). 



Fishmoth, springtail, cockroach, grasshopper, cricket, katydid, 

 locust, dragon-fly, caddis-fly, may-fly, white ants or termites, 

 ant-lion, water-boatman, water-bug, back-swimmer, chinch- 

 bug, squash-bug, lice, plant-lice, Phyllox' era, scale-insect, 

 gnat, mosquito, flea, house-fly, stag-beetle, wood-beetle, water- 

 beetle, potato-beetle, ladybug, firefly, moth, butterfly, ants, 

 honey-bees and bumblebees, wasps, hornets, yellow-jackets. 

 Class V. Arach nida (arachne, spider). 



Garden-spider, taran'tula, bird-spider, trap-door spider, mite, 

 tick, king-crab or horseshoe crab. 



BRANCH XIII. CHORDATA (chorda, a cord, referring to the 



notochord) 



SUBBRANCH I. Adelbchcr' da. Class Adelochorda. 

 SUBBRANCH II. Urochor'da. Class Urochord- 



Sea-squirts, Tunica'ta, Ascid'ians. 

 SUBBRANCH III. Vertebra ta (vertebratus, jointed). 



Division A. Acra'nia (a, without; cranion, skull). Class Lepto- 



cardii. 



Lancelet (BranchiSs'toma = Amphiox'us). 

 Division B. Crania'ta. 



