PERIOD OF CUVIER. 



313 



equality between all the divisions of Cuvier is, no doubt, 

 partly owing to the state of Zoology and of zoological 

 museums at the time he wrote, and to his determination 

 to admit into his work only such representatives of the 

 animal kingdom as he could, to a greater or less extent, 

 examine anatomically for himself ; but it is also partly to 

 be ascribed to Iris conviction, often expressed, that there 

 is no such uniformity or regular serial gradation among 

 animals as many naturalists have attempted to introduce 

 into their classifications. 



CLASSIFICATION OF LAMARCK. 



Histoire naturelle des Animaux sans vcrtebres, etc.; Paris, 1815-1822, 7 

 vols. 8vo. A second edition with notes has been published by Messrs. Des 

 Hayes and Milne-Edwards ; Paris, 1835-1843, 10 vols. 8vo. For the suc- 

 cessive modifications this classification has undergone, see also : Systeme des 

 animaux sans vertebres, etc.; Paris, 1801, 8vo. Philosophic zoologique, 

 etc.; Paris, 1809, 2 vols. 8vo. Extrait du Cours de Zoologie du Museum 

 d'Histoire naturelle, etc.; Paris, 1812, 8vo. 



INVERTEBRATA. 



I. APATHETIC ANIMALS. 



CL. 1. INFUSORIA. Ord. Nuda, Appendi- 



culata. 

 CL. 2. POLYPI. Ord. Ciliati (Rotifera), De- 



uudati (Hydroids), Vaginati (An- 



thozoa and Bryozoa), and Natantes 



(Crinoids, and some Halcyonoids). 

 CL. 3. RADIARIA. Ord, Mollia (Acale- 



Do not feel, and move 

 only by their excited 

 irritability. No brain, 



phas), Echinoderms (including Ho- f nor elongated medul- 



lothurire and Actinia}). 



CL. 4. TUNICATA. Ord. Bothryllaria (Com- 

 pound Ascidians), Ascidia (Sim- 

 ple Ascidians). 



CL. 5. VERMES. Ord. Molles and Rigi- 

 duli (Intestinal Worms and Gor- 

 dius), Hispiduli (Nais), Epizoarias 

 (Epizoa, Lorna3ans). 



lary mass ; no senses ; 

 forms varied; rarely ar- 

 ticulations. 



