Ouvrage accompagné de planches, 1 vol. in-8 reliure demi-chagrin brun, Librairie Encyclopédique de Roret, Paris, 1841, XII-684 pp.
Texte seul, sans l'album de planches. "In this work, which became the starting point for later attempts to classify the protozoa, Dujardin reasserted his views but treated Ehrenberg rather more fairly than Ehrenberg had treated him. The polemic between Dujardin and Ehrenberg stimulated great interest in the microscopic animals and focused attention on one of the most important and recurrent issues in the history of biologu - the relation between structure and function" (DSB, IV, 233). "Further modifications of and improvemens in the classification of bacteria" (Garrison-Morton, 2470) Etat très satisfaisant (texte seul, dos un peu frotté, des rouss.)