ANATOMICAL SYSTEMS. 325 



The general arrangement of the classification of Bur- 

 meister 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 Eegular Animals to the Actinozoaria, 

 and the Symmetrical Animals to the Artiozoaria ; while 

 his subtypes of the Symmetrical Animals correspond to 

 the types de Blainville admits among Ins Artiozoaria, 

 with this important improvement, however, that the 

 Malentozoaria are suppressed. Burmeister reduces, un- 

 happily, 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 presented in their true light. In his special works, 1 

 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 acquaint- 

 ance with the Crustacea and Insects, and their meta- 

 morphoses. 



CLASSIFICATION OF OWEN. 



The following diagram is compiled from R. OWEN'S Lectures on the Com- 

 parative Anatomy and Physiology of the Invertebrate Animals; 2nd edit., 

 London, 1855, 1 vol. 8vo. 



Province. VERTEBRATA. Myelencephala. (Owen.) 



\jli. MAMMALIA. ~\ The classes Mammalia, Aves, and Reptilia, are not yet included 

 CL. AvES. > in the second volume of the "Lectures," the only one relating to 



Cli REPTILIA J Vertebrata thus far published. 



1 These works are: Beitriige zur lebenden Verwandten entwickelt; 



Naturgeschichte der Rankenfiisser Berlin, 1843, 1 vol. 4to.; Engl. by the 



(Cirripedia); Berlin, 1834, 1 vol. 4to. Ray Society, London, 1847, 1 vol. 



Handbuch der Entomologie ; Ber- fol. Compare also his recent work, 



lin, 1832-47, 5 vols. 8vo.; Engl. by Zoonomische Briefe, allgemeine Dar- 



W. E. Shuckard, London, 1836. Die stellungder thierischen Organisation; 



Organisation der Trilobiten,aus ihren Leipzig, 1856, 2 vols. 8vo. 



