132 HANDBOOK OF PROTOZOOLOGY 



Genus Actinomonas Kent. Body generally spheroidal, with 

 a single flagellum and radiating axopodia or filopodia. Ordi- 

 narily attached with a cytoplasmic process to foreign object, 

 but undergoes free-swimming movement by withdrawing it. 

 A single nucleus central; several contractile vacuoles. Holozoic. 



Actinomonas mirahilis Kent (Fig. 44, g). Diameter about 

 10 microns; flagellum 20 microns long. Fresh water. 



Genus Dimorpha Gruber. Ovoid or subspherical; with two 

 flagella and radiating axopodia, all arising from an eccentric 

 granule. The nucleus is also eccentric. Pseudopodia are some- 

 times withdrawn. In fresh water. 



Dimorpha ?nutans Gruber (Fig. 44, h). Diameter up to 15 

 microns. 



Genus Pteridomonas Penard. Body small, heart-shaped, 

 usually attached with a long cytoplasmic process. From the 

 opposite pole, there arises a single flagellum, around which 

 occurs a ring of extremely fine filopodia or flagella. The nu- 

 cleus central; a contractile vacuole. Holozoic. Fresh water. 



Pteridomonas pulex Penard (Fig. 44, i). About 20 microns 

 wide. 



Genus CiliophrysCienkowski. Body spherical with extremely 

 fine radiating filopodia, giving the appearance of a helio- 

 zoan, with perhaps a single flagellum which is difficult to 

 distinguish from the numerous filopodia, but which becomes 

 conspicuous when the pseudopodia are withdrawn. Fresh or 

 salt water. 



Ciliophrys infusionum Cienkowski (Fig. 44, j,k). Flagel- 

 lated stage 25 to 30 microns long. Fresh water infusion. 



Ciliophrys mariria Caullery. Diameter about 10 microns. 

 Salt water. 



References 



Becker, E. R. 1925 The morphology of Mastigina hylae 

 (Frenzel) from the intestine of the tadpole. Jour. Paras., 

 Vol. 11. 



Lemmermann, E. 1914 Pantostomatineae. Siisswasserflora 

 Deutschlands, etc. H. 1. 



