EDMONDSON — PROTOZOA OF IOWA. 33 



rays; short, lobate pseudopodia also may sometimes be present. 

 Flagella two in number, nearly equal in length, originating from 

 the anterior border some distance apart. 



Diameter of the body, 10-15 microns. (Fig. 44, PI. VII.) 



This organism also stands on the border line between the Sar- 

 codina and Mastigophora, possessing some characters of each, and 

 by way of such forms as this must be traced the ascent from the 

 lowest unspecialized, to the more highly organized protozoan 

 cells. 



No oral opening has been observed and no doubt Acinetadis 

 viirabilis ingests food as does Ama;ba, the pseudopodia serving 

 similar functions in both animals. 



By stimuli of various sorts the organism may be induced to 

 withdraw its pseudopodia entirely and then, in appearance, it 

 resembles a true flagellate. 



I have observed reproduction to take place by longitudinal 

 fission, the point of division being between the flagella, an addi- 

 tional flagellum being formed on each portion before complete 

 separation. One or two contractile vesicles are present, also a 

 centrally located spherical nucleus. 



Figure 44, Plate VII, illustrates a normal individual. Found 

 but a few times in this state. Habitat, pond water. 



Family, HFTEROMONADID^. 



ANTHOPHYSA Bory d. St. Vincent. 



Animals united in compact clusters, often attached to a some- 

 what rigid, simple or branched stalk. Bodies pear-shaped, each 

 with two flagella of unequal length. 



Anthophysa vegetans Miill. 



Bodies attached in rosette-like clusters, each zooid pyriform in 

 shape, obliquely truncate anteriorly, provided with two flagella 

 of unequal length. Clusters often attached to a branched pedicle. 

 I^ength of body, 5-10 microns. (Figs. 47-48, PI. VII.) 

 Many diverse opinions concerning this species have been held 

 by authorities. Some have regarded it as an aquatic fungus, 

 while others have considered it to be an intermediate organism 

 between the plant and animal series. 



[PROC. D. A.S., VOL.XI.I 5 [Mays, 1906. j 



