PRINCIPAL SYSTEMS OF ZOOLOGY 227 



Cl. 9. Pisces. 

 Cl. 10. Amphibia. 

 Cl. 11. Aves. 

 Cl. 12. Mammalia. 



The general arrangement of the classification of Burmeister recalls 

 that of de Blainville; only that the order is inverted. His three types 

 correspond to the three subkingdoms of de Blainville: the Irregular 

 Animals to the Heterozoaria, the Regular Animals to the Actinozo- 

 aria, and the Symmetrical Animals to the Artiozoaria; while his sub- 

 types of the Symmetrical Animals correspond to the types de 

 Blainville admits among his Artiozoaria, with this important im- 

 provement, however, that the Malentozoaria are suppressed. Bur- 

 meister reduces, unhappily, the whole branch of Mollusks to one 

 single class. The Arthrozoa, on the contrary, in the investigation of 

 which Burmeister has rendered eminent service to science are pre- 

 sented in their true light. In his special works,^^ his classification of 

 the Articulata is presented with more details. I have no doubt that 

 the correct views he entertains respecting the standing of the Worms 

 in the branch of Articulata are owing to his extensive acquaintance 

 with the Crustacea and Insects and their metamorphoses. 



CLASSIFICATION OF OWEN 



The following diagram is compiled from R. Owen's Lectures on the Comparative 

 Anatomy and Physiology of the Invertebrate Animals (2d edit., London, 1855). 



Province. Vertebrata. Myelencephala (Owen.) 

 Cl. Mammalia. 1 



p, . 1 The classes Mammalia, Aves, and Reptilia are not yet included in the second vol- 



_ ' „ ' . I ume of the "Lectures," the only one relating to Vertebrata thus far published. 



Cl. Reptilia. J . / 5 



Cl. Pisces. Ord. Dermopteri, Malacopteri, Pharyngognathi, Anacanthini, Acanthop- 



teri, Plectognathi, Lophobranchii, Ganoidei, Protopteri, Holocephali, Plagio- 



stomi. 



Province. Articulata. Homogangliata. (Owen.) 

 Cl. Arachnida. Ord. Dermophysa, Trachearia, Pulmotrachearia, and Pulmonaria. 

 Cl. Insecta. Subclass: Myriapoda. Ord. Chilognatha and Chilopoda. Subclass: Hexa- 



poda. Ord. Aptera, Diptera, Lepidoptera, Hymenoptera, Homoptera, Strepsip- 



tera, Neuroptera, Orthoptera, and Coleoptera. 

 Cl. Crustacea. Subclass: Entomostraca. Ord. Trilobites, Xiphosura, Phyllopoda, 



Cladocera, Ostracopoda, Copepoda. Subclass: Malacostraca. 1°. Edriophthalma. 



Ord. Laemodipoda, Isopoda, Amphipoda. 2°. Podophthalma. Ord. Stomapoda, 



Decapoda. 

 Cl. Epizoa. Ord. Cephaluna, Brachiuna, and Onchuna. 



^ These are: Beitrdge zur Naturgeschichte . . . (1834), Handbuch der Entomologie 

 (5 vols., Berlin, 1832-1844), Die Organisation der Trilobiten, aus ihren lebenden Ver- 

 wandten entwickelt (Berlin, 1843; English ed., London, 1847). 



