$ 5. INFUSORIA AND RHIZOPODA. 23 
Cuass RHIZOPODA. 
Organs of locomotion consisting of completely retractile, ramifying 
prolongations of the body. 
ORDER I. MONOSOMATIA. 
Famity: AMOEBAEA. 
Genus: Amoeba. 
Famity: ARCELLINA. 
Genera: Arcella, Difiugia, Gromia, Miliola, Euglypha, Trinema. 
ORDER II. POLYSOMATIA. 
Genera: Vorticialis, Geoponus, Nonionina.™ 
BIBLICGRAPHY 
O. F. Miller. Animalcula Infusoria. Hafniee, 1786. 
Ehrenberg. Die Infusionsthierchen als vollkommene Organismen, 
Leipzig, 1838. Also his numerous and important memoirs upon the 
Infusoria and Rhizopoda in the Memoirs of the Berlin Academy, and its 
Monthly Bulletin. 
Andrew Pritchard. A History of Infusoria, living and fossil, arranged 
according to the ‘“Infusionsthierchen,” of Ehrenberg. Llustrated by 
nearly 800 colored engravings of these curious creatures, highly magnified. 
London, 1841. 
Kutorga. Naturgeschichte der Infusionsthierchen, vorztiglich nach Eh- 
renberg’s Beobachtungen bearbeitet. Calsruhe, 1841. 
Dujardin. Histoire Naturelle des Zoophytes. Infusoires, Paris, 1841. 
This work treats also of the Rhizopoda. 
ADDITIONAL BIBLIOGRAPHY. 
Besides the various articles quoted in the additional notes I have made 
the following are among the more important recent writings on this subject: 
Cohn. Beitrage zur Entwickelungsgeschichte der Infusorien, in Siebold 
& Kolliker’s Zeitsch. III. Hft. 3, and IV. Hft. 3. 
Ecker. Zur Entwickelungsgeschichte der Infusorien, in Siebold & Kdl- 
liker’s Zeitsch. III. Hft. 4. 
Stein. Neue Beitr. zur Kenntn. d. Entwickelungsg. u. d. feineren 
Baues d. Infusionsthiere, in Siebold & Kolliker’s Zeitsch. III. p. 475. 
Pritchard. A History of Infusorial Animalcules, living and fossil, &c., 
with illustrations, new edition. London, 1852. 
See also numerous notes in the Annales des Sciences Naturelles, since 
1847.— Ep. 
1In this table are mentioned the families and genera of those only which have been the objects 
of anatomical study. 
