208 ESSAY ON CLASSIFICATION. Part I. 



CLASSIFICATION OF VON SIEBOLD AND STANNIUS. 



Tliis classification is adopted in the following work: Siebold, (C. Tii. v.,) and Stannius, (H.,) Lehrbueli 

 der vergleichenden Anatomie, Berlin, 1845, 2 vols. 8vo. A second edition is now in press. 



EVERTEBEATA. 

 I. Protozoa. 



Cl. 1 . Infusoria. Ord. Astonia and Stomatoda. 



Cl. 2. R li i z o p o d a . Ord. Monosomatia and Polysomatia. 



II. ZOOPHYTA. 



Cl. 3. Polypi. Ord. Anthozoa and Bryozoa. 

 Cl. 4. Acalephae. Ord. Siplionophora, Discophora, Ctenopliora. 



Cl. 5. E ch i n o d e r ni a t a. Ord. Crinoidea, Asteroidea, Ecliinoidea, Holothurioidea, and 

 Sipunculoidea. 



III. Vermes. 



/IP -IT,.,, n J r^ r • ri ( Since the publication of the work quoted aliove, Sie- 



Cl. G. II e 1 m m t h e s . Ord. Cystici, Ces- ' ' ' 



, ,. 'lold has introduced most important improvements in the 

 todes, Trematodes, Acanthocephah, J. , ^ , , . , 



classification of the Worms, and greatly increased our 



Gordiacei, Nematodes. [ knowledge of these animals. 



Cl. 7. Turbellarii. Ord. Rhabdocoeli, DendroccEli. 

 Cl. 8. R o t a t o r i i . Not subdivided into orders. 

 Cl. 9. A n n u 1 a t i . Ord. Apodes and Chaetopodes. 



IV. Mollusca. 



Cl. 10. Acepliala. Ord. Tunicata, Brachiopoda, Lamellibranchia. 



Cl. 11. Cephalophora, Meek., (Gasteropoda.) Ord. Pteropoda, Ileteropoda, Gasteropoda, 

 Cl. 12. Cephalopoda. Not subdivided into orders. 

 V. Arthropoda. 



Cl. 13. Crustacea. Ord. Cirripedia, Siphonostoma, Lophyropoda, Phyllopoda, Pa?cilopoda. 



Lajraodipoda, Isopoda, Amphipoda, Stomapoda, Decapoda, Myriapoda. 

 Cl. 14. Arachnida. Orders without names. 

 Cl. 15. Insecta. a. Ametabola. Ord. Aptera. b. H e m i m e t a b o 1 a ; Ord. Ile- 



miptera, Orthoptera. c. Holometabola. Ord. Diptera, Lepidoptera, Hymenop- 



tera, Strepsiptera, Nevroptera, and Coleoptera. 



VERTEBRATA. 

 VI. Vertebrata. 



Cl. 16. Pisces. Subclasses: 1st. Leptocardii. 2d. M ar sipob ranc h i i . 3d. 



Elasmobranchii ; Ord. Holocephali, Plagiostomi. 4th. G a n o i d e i ; Ord. 



Chrondrostei, Holostei. 5tli. T e 1 e o s t e i ; Ord. Acantliojiteri, Anacanthini, Pharyn- 



gognatlii, Physostomi, Plectognathi, Lophobranchii. Cth. Dipnoi. 

 Cl. 17. R e p t i 1 i a . Subclasses : 1 st. D i p n o a ; Ord. Urodela, Batracliia, Gymnopliiona. 



2d. M o n o p n o a : a. Streptostylica ; Ord. Ophidia, Sauria. b. Monimostylica ; Ord. 



Chelonia, Crocodila. ^ The subdivisions of the classes Pisces and Reptilia are taken from the sec- 

 ond edition, published in 1854-1856, in which J. MUllcr's arrangement of the 

 Cl. 18. Aves. V Fishes is adopted; that of the Reptiles is partly Stannius's own. The 



classes Aves and Mammalia, and the first volume of the second edition, are 

 Cl. 19. Mammalia. J not yet out. 



J 



