5 6 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



BRANCH VI. TROCHELMIN'THES (wheel-worms) 

 Class I. Rotifer a (wheel animalcules). 



BRANCH VII. M(3LLUSCOI'DA 



(small animals which are more or less mollusc-like) 



Class I. Pdlyzo'a (moss-animals). 



Class II. Phord'nida (worm-like animals living in sand). 

 Class III. Br&chiop' oda (lamp-shells, small marine animals with 

 a bivalve shell). 



BRANCH VIII. ECHINODER'MATA 



(radially symmetrical, marine animals with a rough 

 or spiny skin) 



Class I. Aster oi'dea (starfishes). 



Class II. Ophiuroi'dea (brittle-stars). 



Class III. Echinoi'dea (sea-urchins). 



Class IV. Hdlothur oi'dea (sea-cucumbers). 



Class V. Crlnoi'dea (sea-lilies, or feather-stars). 



BRANCH IX. ANNEL'IDA (segmented worms) 



Class I. Archiannffl ida (marine worms living in the sand). 



Class II. Chcetdp'oda (earthworms, Nereis, et al.). 



Class III. Gephyre'a (jef-e-re'-a) (marine, worms of uncertain 

 relationship, with little or no traces of segmenta- 

 tion in the adult). 



Class IV. Hirudlriea (leeches) 



BRANCH X. ARTHR^P'ODA 



(animals with the body more or less distinctly seg- 

 mented and with jointed appendages) 



Class I. Crustd'cea (crayfish, lobsters, crabs, shrimps, et al.). 



Class II. Onychdph'ora (slime-slugs). 



Class III. Myri&p'oda (myriapods, centipedes, et al.). 



Class IV. Insec'ta (insects). 



Class V. Arach'nida (scorpions, spiders, mites and ticks). 



BRANCH XI. M6LLUS'CA 



(bilaterally symmetrical, unsegmented animals, most 

 of which have shells) 



Class I. AmpMneu'ra (chitons, et al.). 



Class II. Gastrdp'oda (snails, slugs, et al.). 



Class III. Scaphop'oda (tooth-shells). 



Class IV. Pelcc^p' oda (clams, mussels, oysters, scallops, et al.). 



Class V. Cephaldp'oda (squids, octopods and nautili). 



