CLASSIFICATION". 
29 
Class IV. CRUSTACEA : divided into eleven Orders, as follows : 
ORDER 1. DECAPOD A, including the crab, pea-crab, calling-crab, hermit-crab, 
shrimp, prawn, cray-fish, lobster, &c. 
ORDER 2. STOMAPODA, including the squilla, opossum-shrimp, &c. 
ORDER 3. ISOPODA, including the wood-louse. 
ORDER 4. AMPHIPODA, including the sand-hopper. 
ORDER 5. L^DIODIPODA, including the whale-louse. 
ORDER 6. XyPHOSURA, including the limuli, or king-crabs. 
ORDER 7. PHYLLOPODA, including the apus, trilobites, &c. 
ORDER 8. OSTRAOODA, including the cypris. 
ORDER 9. COPEFODA, including the cyclops. 
ORDER 10. PARASITA, including the argulidse, &c. 
ORDER 11. GIRRHOPODA, including barnacles and sea-acorns. 
Class V. MOTIFEfSA : divided into two Orders^ as follows : 
ORDER 1. NATAUJTIA, including the polytrocha, &c. 
ORDER 2. SESSILIA, including the fioscularid£e. 
Class VI. A]\]\EI<II>A: divided into four Orders, as follows : 
ORDER 1. ERRABITIA, including the sea-mice, lob-worm, peripatus, nereis, &c. 
ORDER 2. TUBICOLA, including the terebella, serpulse, &c. 
ORDER 3. SOOLEOIKTA, including the earth-worms. 
ORDER 4. SUCTORIA, including the leech. 
Class VII. NEHIATEIiMIA : divided into three Orders, as follows : 
ORDER 1. NEMATOIDEA, including the thread-worm, Guinea-worm, &c. 
ORDER 2. GORDIACEA, including hair-worms. 
ORDER 3. AOAIXTTHOGEPHALA, including parasitic worms. 
Class VIII. PL ATYEt.MIA ; divided into three Orders, as follows : 
ORDER 1. PLAIXTARIDA, including the ribbon-worm. 
ORDER 2. TREMATODA, including the fluke. 
ORDER 3. CESTOIDEA, including the tape-worm. 
Division IV. RADIATA. 
Divided into five Classes and various Orders, as follows : 
Class I. ECmi¥OJ>ER]IIATA : divided into four Orders, as follows : 
ORDER 1. HOLOTHURIDA, including the sea-cucumber. 
ORDER 2. ECHirnDA, including the sea-eggs, sea-urchin, &c. 
ORDER 3. STELLERIDA, including the gorgon's head and star-fishes. 
ORDER 4. GRINOIDEA, including the hair-stars, sea-lilies, &c. 
Class II. SIPHOIVOPHORA : divided into two Orders, as follows : 
ORDER 1. PHYSOGRADA, including the Portuguese man-of-war. 
ORDER 2. OHONDROGRADA, including the velella. 
Class III. CTEMOPHOSS A : comprising one Order, and including the oestum ve- 
neris, and cydippe or beroe. 
Class IV. BIISCOPIIORA : divided into two Orders, as follows : 
ORDER 1. STEGABIOPHTHALMATA, including various kinds of covered-eyed 
medusae, called jelly-fishes, sea-nettles, sea-blubbers, acalephse, &c. 
