352 



NATURAL HISTORY. 



as Echinoderms, the nerves are nothing but protoplasmic threads. Impossible as it would be 

 for highly organised animals to move and get their living without bones and muscles, yet without 

 protoplasm, coating their stomachs and other organs, and floating in their blood, to carry on the 

 work of preparing and distributing organic products to the well-being of the whole, they could not 

 exist ; and in the nerves protoplasm is the mysterious communicator of both functional activity and 

 the over-ruling will. 



LIV. The Bibliography of the Rhizopoda is immense. Dr. Leidy (in his book often quoted) 

 gives twenty-three quarto pages full of memoirs on the fresh-water forms ; but many of these 

 refer also to marine Rhizopods of various kinds. For English readers, W. Archer, H. J. Carter, 

 J. Leidy, and last, but not least, G. C. Wallich, have treated of Amcebans, Actinophryns, 

 &c.; and among foreigners, Auerbach, Cienkowski, Claparede and Lachman, Dujardin, Ehrenberg, 

 Greeff, Hertwig, Lesser, Perty, and Schulze. For Radiolaria, Ehrenberg, Haeckel, Wallich, 

 and others should be studied. For Foraminifera, English students will find, among many others, 

 Williamson, Carpenter, Carter, Parker, Jones, Siddall, and H. B. Brady ; and among very many 

 foreign naturalists Ehrenberg, Lamarck, d'Orbigny, von Reuss, Bornemann, Seguenza, Karrer, 

 d'Archiac, and especially Max Schultze. 



CLASSIFICATION OF THE RHIZOPODA. (After WaUich.} 

 RHIZOPODA. 



1. Nucleus and Contractile Vesicle. 

 PROTEINA. 



2. Nucleus ; no Contractile Vesicle. 

 PROTODEKMATA. 



3. No Nucleus; no Contractile 

 Vesicle. 



T. RUPERT JONES. 



