CLASSIFICATION. 29 



Class IV. CRUSTACEA *. divided into eleven Orders, as follows: 



ORDER 1. DECAPODA, 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. ISQPODA, including the wood-louse. 

 ORDER 4. AMPHIPODA, including the sand-hopper. 

 ORDER 5. LJEMODIPODA, including the whale-louse. 

 ORDER 6. XYPHOSURA, including the limuli, or king-crabs. 

 ORDER 7. PHYLLOPODA, including the apus, trilobites, &c. 

 ORDER 8. OSTRACODA, including the cvpris. 

 ORDER 9. COPEPODA, including the cyclops. 

 ORDER 10. PARASITA, including the argulidse, &c. 

 ORDER 11. CIRRHOPODA, including barnacles and sea-acorns. 



Class V. ROTIFERA : divided into two Orders, as follows : 



ORDER 1. NATANTIA, including the polytrocha, &e. 

 ORDER 2. SESSILIA, including the floscularidae. 



Class VI. ANNELIDA: divided into four Orders, as follows : 



ORDER 1. ERRANTIA, including the sea-mice, lob-worm, peripatus, nereis, &c. 



ORDER 2. TUBICOLA, including the terebella, serpulse, &c. 



ORDER 3. SCOLECINA, including the earth-worms. 



ORDER 4. SUCTORIA, including the leech. 



Class VII. NEJIATELJI1 A : divided into three Orders, as follows : 



ORDER 1. NEMATOIDEA, including the thread-worm, Guinea-worm, &c. 



ORDER 2. GORDIACEA, including hair-worms. 



ORDER 3. ACANTHOCEPHALA, including parasitic worms. 



Class VIII. PL ATYELMIA : divided into three Orders, as follows : 



ORDER 1. PLANARIDA, 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. ECHINODERJIATA : divided into four Orders, as follows : 



ORDER 1. H0L0THURIBA, including the sea-cucumber. 



ORDER 2. ECHINIDA, including the sea-eggs, sea-urchin, <kc. 



ORDER 3. STELLERIDA, including the gorgon's head and star-fishes. 



ORDER 4. CRINOIDEA, including the hair-stars, sea-lilies, &c. 



Class II. SIt'HONOPHORA : divided into two Orders, as follows : 



ORDER 1. PHYSOGRADA, including the Portuguese man-of-war. 

 ORDER 2. CH0NDR0GRADA, including the velella. 



Class III. CTENOPHOR A : comprising one Order, and including the cestum ve- 

 neris, and cydippe or beroe. . • 



Class IV. DISCOPHORA : divided into two Orders, as follows : 



ORDER 1. STEGANOPHTHALMATA, including various kinds of covered-eyed 

 medusae, called jelly-fishes, sea-nettles, sea-blubbers, acalepha?, <fec. 



