xxvi CLASSIFICATION OF THE ANIMAL KINGDOM 



Phylum III. CCELENTERATA— continued. 



Class IV. CTENOPHORA. 

 Order 1. Cydippida. 

 ,, 2. Lobata. 

 ,, 3. Cestida. 

 4. Reroida. 



Appendix to Ctenophora — Cttnoplana 

 and Gceloplana. 



Order 1. Platyctexea. 



Appendix (II) to Calenterata — Mesozoa. 



Phylum IV. PLATYHELMINTHES. 



Class I. TURBELLARIA. - 

 Order 1. Polycladida. 

 ,, 2. Tricladida. 



„ 3. RHABDOtXELIDA. 



Class II. TREMATODA.^ 



Order 1. Monogexetica. 

 ,, 2. Digenetica, 



Order 3. Aspidocotylea. 

 ,, 4. Temnocephalea. 

 U Class HI. CESTODA. 



Order 1. Moxozoa. 

 ,, 2. Polyzoa. 



Appendix to Platyhelminthes — Class 

 NEMERTINEA. 



Class I. NEMATODA. ^ 

 Order 1. Nematoidea. 

 ,, 2. Nematomorpha. 



Class II. ACANTHOCEPHALA. 



Phylum V. NEMATHELMINTHES. b 



Class III. CHJETOGNATHA. 



Appendix to Nemathelminthes — Chiv- 

 tosomidie, Echinoderidce, and Desmos- 

 colecidce. 



Phylum VI. TROCHELMINTHES. w 



Class I. ROTIFi-RA. u 



Order 1. Rhizota. 

 ,, 2. Bdelloiua. ; 

 ,, 3. Ploima. 

 Sub-order a. Illorkata. 

 ,, b. Loricata. 



Order 4. Scirtopoda. 



Order 5. Trochospha;rida. 

 „ 6. Seisoxida. 



Class II. GASTROTRICHA. 



Appendix to Trochelminthes— Dino- 

 philea and HistriobdeMea. 



Phylum VII. MOLLUSCOIDA. 



Class I. POLYZOA. 



Sub-class I. Ectoprocta. 

 Order 1. Oymxol;emata. 

 Sub-order a. Cyclostomata. ■ 

 ,, b. Cheilostomata. 

 ,, c. Ctenostomata. 



Order 2. Phylactol;emata. 

 Sub-class II. Endoprocta. 

 Class II. PHORONIDA. 

 „ III. BRACHIOPODA. 



Order 1. Inarticulata. 

 2. Articulata. 



Phylum VIII. ECHINODERMATA. 



Class I. ASTEROIDEA. 



Order 1. Phaxerozoxia. 

 ,, 2. Cryptozoxia. 

 Class II. OPHITJROIDEA. 

 Order 1. Lysophiurje. 

 ,, 2. Streptophiurje. 



Order 3. Cladophiukj;. 



,, 4. Zygophiurte. 

 Class III. ECHINOIDEA. 

 Order 1. Regularia. 



., 2. Clypeastridea. 



,, 3. Spataxgoidea. 



