Class 1. Infusoria. Orders: Nuda. .Appendi enlata.
Class 2. Polypi. Orders: Ciliata (Rotifera), Denudati (hydroids), Vaginati (Anthozoa and Bryozoa). and Natantes (crinoids and some haleyonoids).
Class 3. Radiaria. Orders: \lollia (Acale pine), echinoderms (including HolothuriT and Actinke).
Class 4. Tunicata. Orders: I3otryllaria (com pound ascidiaus). Ascidia (simple aseidians).
Class 5. Vermes. Orders: Molles and Rigi dull (intestinal worms and gordius), Hispiduli (Nail). Epizoarite (cpizoa and lermeans).
II. Seasitire A nimals.
Class 6. Insects (hexapods). Orders: Aptera, Diptera. Hemiptera, Lepiduptera, Hymenoptera, Neuroptera, Orthoptera, Coleoptera.
Class 7. Arachnids. Orders: Autennatotra dwales (Thysanura and Exantenna totracheales and Exantennato-brancheales (Araeli nida proper).
Class S. Crustacea. Orders: li•terobranchia (Brancliiopoda. Isopoda. ..-kniphipoda, Stoma poda 1 and Homobranch ia ( Deca pod a ).
Class 9. Annelids. Orders: Apoda, Antennata, Sedenta ria.
Class 10. Cirripeds. Orders: Sessilia and Pedunculata.
Class 11. Conchifera. Orders: Dimyaria, Mon ornya ria.
Class 12. :Mollusks. Orders: Pteropoda, tropoda, Trachelipoda, Cephalopoda, Ileteropoda. Siebold and Stannins (1'445) also divided the animal kingdom into vertebrates and in vertebrates: and among the invertebrates the Protozoa were rerognized as a separate type, and Venues came to have very much the sigmili that it has in our modern classifications.
The classification of Lend:art is interesting,. because it comes near to Our present conceptions of the relationship of animals, mid because of the fact that its author was a great teacher of zoiilogy: and, hence. his classification has had great influence in education. Leu•ka•t. Diu Morphologic and die Icrirandt.s.chaftsrcrlhiltnissu th• wirbrllosen Thicre 1S4s), divides animals above Protozoa (to which he paid. no at tention) into six 'types; as follows: Type 1. Co•lenterata.
Class 1. Polypi. (Orders: Anthozoa and Cyli cozoa.)
Class 2. Aealepine. (Orders: Dis•ophorce and Clenophorie.) Type II. Class 3. Pelmatozoa. (Orders: Cyst idea and Crinoidea.) Class 4. Actinozoa. (Orders: E•hinida and Astcrida.) Class 5. Seytodermata. (Orders: Holothurim and Sipunculida.) Type III. Class 6. .Anenterati. (Orders: Cestodes and A ea nth oceph a 1 i. ) Class 7. _Apodes. (Orders: Nemertini, Trematodes, and Ilirudinei.) Class S. Ciliati. (Orders: Bryozon. and Roti feri.) Class 9. Annelides. (Orders: Nematodes, Lum bricini, and Branchiati.) Type Arthropoda.
Class 10. Crustacea. (Orders: Entomostraca and Malacostraca.) Class 11. Inseeta. (Orders: Myriapoda, Araehnida, and Hcxapoda.) Type V. Molluscs.
Class 12. Tunieata. (Orders: Aseidia• and Salm-e.) Class 13. Acephala. (Orders: Lamellibranchi ata and Brachiopoda.) Class 14. Gast ropoda. (Orders: lleterobran chiata. Dermatobranchia, Ileteropoda, Cteno bran•hia, Pulmonata, and Cyclobranehia.) Class 15. Cephalopoda.
Type VI. Ferteb•ata (according to Cuvier).
Glen, Eon Baer, and Agassiz.-The foregoing and certain other classifications had been devel oped in England, France, and Germany, under the guidance of anatomy; but, in ninny of them, the idea of the complexity of structure of ani mals seemed to outweigh the idea of unity of structure. During the early part of the nine teenth century another school developed in Ger many, under the leadership of Schelling-the School of Natural Philosoph•-which has ex tended its influence to all the physical sciences. Of its doctrines such men as Geoffroy Saint Hilaire in France. and Goethe and Oken in Ger many. became expounders, and taught that unity prevailed everywhere: hence, the animal kingdom was composed of an unbroken series of animals. The most hnportant system of classification evolved by this school is that of Oken. Cor responding with the invertebrates is Oken's in testinal-body, or touch-animals. as lie called them Lairbueh der :Vat urph ilosophic, Jena, 1810).