ZOOLOGY 813 Grade 2. Ditrema. Branch a. Marsupialia. Orders. 1. Barypoda, 2. RhizopJiaga. 3. Macropoda. 4. Carpophaga. 5. Pedi- mana. 6. Cant/tarophaga. 7. Creophaga. 8. Edcntula. Branch b. Placentalia. Sub- Branch a. Typidcntata. Orders. 1. Proinsectivora. 2. Inscctivora. 3. Carnivora. 4. Cctacea. 5. Ungulata. 6. Airiblypoda. 7. Sircnia. 8. Toxodon- tia. 9. Rodentia. 10. Proboscidca. 11. Hyracoidea. 12. Cheiroptera. 13. P? - o- simife. 14. Simiee. Sub-Branch &. Edentata. Orders. 1. Bradypoda. 2. Effodientia. rhylum 2. ECHINODERMA. Branch A. Ambulacrata. Class I. HOLOTHURIDEA. Orders. 1. Elasipoda. 2. Pedata. 3. Apoda. ,, II. ECHINOIDEA. Grade . Palaeechini (Melonitcs, Eocidaris). Grade 6. Autechini. Branch 1. Dcsmosticha. Orders. 1. Regularia. 2. Exocyclica. Branch 2. Pctalosticha. Orders. 1. Clypcastrlna. 2. Spatangina. ,, III. ASTKROIDEA. Orders. 1. Colastra, 2. Brisingastra. ,, IV. OPHIUROIDEA. Orders. 1. Ophiastra. 2. Phytastm. Branch B. Tentaculata. Class I. CRIXOIDEA. Orders. 1. Palseocrina. 2. Ncocrina. ,, II. CYSTOIDEA. Orders. 1. Aijclacrina. 2. Echincncrina. ,, III. BLASTOIDEA. Orders. 1. Elwacrina. 2. Elcutherocrina. Phylum 3. PODAXONIA. Class I. GEPHYR. EA. Sub-Class 1. Echiuromorpha. Orders. 1. Stcrnaspida. 2. EcMurina. Sub-Class 2. Sipunculomorjiha. Orders. 1. Sipunculina. 2. Priapulinn. ,, II. POLYZOA. Sub- Class 1. Vcrmiformia. (Genus : Phoronis.} ,, 2. EupoJyzoa. Branch a. Ectoprocta. Orders. 1. Phyladoleema. 2. Gymnols&ma. Branch b. Entoprocta. (Lomsoma, &c. ) [The sub-class Pterobranchi-a (RJisibdopIcura and Ccphalodiscus) hitherto referred to Polyzoa are probably related to the Hemichorda of the Vertebrate phylum. ] ,, III. BRACHIOPODA. Orders. 1. Ecardincs. 2. Cardinata. Phylum 4. NEMATOIDEA. Class I. EUNEMATOIDEA (no orders). ,, II. ClLETOSOMARIA. ( Ch&tosoma, Rlmbdogastcr. ) ., III. CH^ETOGNATIIA. (Sayitta, SpadcUn. ) Phylum 5. ACANTHOCEPHALA. (Genus : Echinorhynchw.) Phylum 6. GASTROTRICHA. (Genera: Chastonotus, Ichthydlmn, &c. ) Phylum 7. PLATYHELMIA. Branch A. Ciliata. Class I. RHAHDOCCELA. Orders. 1. Accela. 2. Orthocixla. 3. Allceoccela. ,, II. DENDROCOZLA. Orders. 1. Triclada. 2. Pohjclada. ,, III. NEMEKTIXA. Orders. 1. Fal&oncmcrtina. 2. Schizoncmcrtea. 3. IIui>loncmcrtca. [The Mcso-oa of Van Beneden may be classed here as a degenerate parasitic group including rthoncctida and Rhombozoa.] Branch B. Cotylophora. Class I. TREMATOIDEA. Sub-Class a. Monogcnca. Orders. 1. Tristumn.. 2. Pulystoma. Sub-Class b. I>igcnca. Orders. 1. Monostoma. 2. Distoma. 3. Gastcro- stoma. 4. llolostoma. Class II. CESTOIDEA. Orders. 1. Amphilinaria. 2. Carynphyllarin. 3. Ligulitria. 4. Echinobolhriaria. 5. Tctrarhyn- chfiria. 6. Phyllobothriaria. 7. Tseniaria. ,, III. HIRUDIXEA. Orders. 1. Rliyncholddla. 2. Gnatkobddla. Phylum 8. APPENDICULATA. Branch A. Rotifera. Class I. PARAPODIATA. (Genus : Pcdalion. ) ,, II. LIPOPODA. Orders. 1. Ploima. 2. Bdclligradn. 3. Rhizota. Branch B. Chsetopoda. Class I. POLYCH^TA. Sub-Class 1. Errantia (orders not tabulated). ,, 2. Scdcntaria (orders not tabulated). ,, II. OLIGOCILETA. Orders. .Luwibricomorpla. 2. Ssenuridomorpha. 3. Naidomorpha. 4. BdellomorpJut. ,, III. MYZOSTOMARIA. (Genus: Myzostomum.) ,, IV. SACCOCIRRIDEA. (Genus : Saccocirrus.) ,, V. HAPLOANNELIDA. (Genera : Polygordius, Protodrilus, Histriobdella}. Branch C. Arthropoda ( = Gnathopoda). Grade 1. Ceratophora. Class I. PERIPATIDEA, (Genus : ,, II. MYRIAPODA. Orders. 1. Diplopoda. 2. CJiilopoda. ,, III. HF;XAPODA. Orders. 1. Orthoptcra (Sub -Orders: Thysanura, Autwthoptcra, Pscudoncuroptcra}. 2. Neuroptera, (Sub-Orders : Planipennia, Trichoptcra). 3. Strep- siptera. 4. Rhyncota (Sub - Orders : Pedicidaria, Aphidaria, Cicadaria, Hcmlptcra). 5. Diptcra (Sub-Orders : Brachyccra, Ncmoccra, Aphaniptcra). 6. Lcpidoptcra. 7. Colcoptcra. 8. Hymenwptera. Grade 2. Acerata. Class I. CRUSTACEA. Grade 1. Entomostraca. Orders. 1. Phyllopoda. 2. Ostracoda. 3. Copc-poda. 4. Cirripcdia. Grade 2. Leptostraca. (Genus : Ncbalia.) Grade 3. Malacostraca. Branch a. Arthrostracct. Orders. 1. Amphipoda. 2. Isopoda. Branch b. Thoracostraca. Orders. 1. Cumacea. 2. Stomapoda. 3. Podo- jjhthahnia. ,, II. ARACHNIDA. Grade a. Delobranchia. Orders. 1. Eurypterina. 2. Xiphosura. 3. Trilobitse. Grade b. Embolobranchia. Orders. 1. Scorpionina. 2. Thelyphonina. 3. Ara- ncina. Grade c. Lipobranchia. Orders. 1. Galcodina. 2. Opilionina. 3. Pscudo- scorpionina. 4. Acarina. ,, III. PANTOPODA. (Genera: Pycnogonum, &c.) ,, IV. TARDIRRADA. (Genera: Macrobiotus, Milncsium, &c.) ,, V. LlNGUATULINA. (Genera : .Pcntastoma, &c.) Phylum 9. MOLLUSCA. Branch A. Glossophora. Class I. GASTROPODA. Grade 1. Isopleura. Ordei s. 1. Polyplacophora. 2. Ncomcniaria. 3. Chxtodcr nutrin. Grade 2. Anisopleura. Branch a. Strcptancura. Orders. 1. Zygubmncliia. 2. Azygobranchia. Branch b. Euthyncura. Orders. 1. Opisthobmnchia. 2. Pulmonata. II. SCAPHOPODA. (Genus: Dcntalium.) ,, III. CEPHALOPODA ( = Siplionopoda}. Orders. 1. Tdrabranchia. 2. Dibranchia. Branch B. Lipocephala. Class. LAMELLIBRAXCHIA.
Orders. 1. Isomya. 2. Ildcroinya. 3 Monomya.