THE SARCODINA 



IO3 



between the classes, and are supposed to show genetic relationships 

 between the groups which they simulate. 



The close connection between the Mastigophora and the Sarcodina 

 has been recognized since the discovery by F. E. Schultze ('75) and 

 Biitschli ('78) of amoeboid forms with flagella. These are unmistak- 

 ably animals which take in food at any portion of the body by means 

 of pseudopodia, and move by means of flagella or pseudopodia. In 

 some instances they are more like an Amceba (Mastigamoeba, F. E. 

 Schultze, Fig. 57, A); in others they are more like a heliozoon 

 (Cihophrys infitsionum of Cienkowsky, or Actinomonas of Kent, Fig. 

 57, B, Mastigophrys of Frenzel, etc.). Their undetermined position 



Fig. 57. — Protozoa with both pseudopodia and flagella. 

 A. Mastigamceba aspera F. E. Sch. [SCHULTZE.] B. Actinomonas pusilla S. K. [KENT.] 

 f t flagellum ; «, nucleus; p, pseudopodia. 



in classification is indicated by the fact that sometimes they are in- 

 cluded with the Sarcodina, while at other times they are regarded as 

 flagellates. Klebs believes that the connection between the two 

 groups is not quite so apparent as the mere description of these inter- 

 mediate forms would indicate, and places between the primitive 

 animal flagellates, the Vampyrellidas, and the Mycetozoa, an inter- 

 mediate group, that of the Pseudosporese, with the genera Pseitdospora 

 and Protomonas which Biitschli includes with the Flagellidia ; while 

 the Rhizopoda are derived from the Vampyrellidae through the Heli- 



