226 The Sarcodina 



the life-cycles are still unknown. Hyalodiscus Hertwig and Lesser (Fig. 

 5. 18, A-G) includes small organisms which may attack filamentous algae. 

 Although several morphological varieties occur, the production of a 

 large plasmodial stage has not been demonstrated for this genus. Schaeffer 

 (132) concluded that Hyalodiscus belongs in the Amoebidae. Vampy- 

 rellidmm Zopf (Fig. 5. 18, H-K) is similar to Hyalodiscus. The "axopodia" 

 of V. vagajis (63) resemble the ectoplasmic ridges of Thecamoeba (132). 



/• 



\\ A 



_ •^'t^;^:^.V^,^..,_ 



^..'^H4^^"^--..: 



/ I \ \ B 



'A^. — 



\» 



i! \ \ 



^'^'^^^ 



A \ y 



n C 



Fig. 5. 19. A. Actinocoma ramosa Penard (14-26/i); pseudopodia may 

 show small granules in movement (after P.). B-D. Nnclearia caulescens 

 Penard (16-20^); free stage (B); form temporarily attached by pseiido- 

 podiinn (C); specimen with a gelatinous sheath (D); after P. E. Gephyra- 

 jnoeba delicatula Goodey, specimen clinging to cyst from which it has just 

 emerged; x375 (after G.). 



The Status of Gephyramoeba Goodey (Fig. 5. 19, E) is somewhat un- 

 certain. Although Gephyramoeba delicatula occasionally reaches lengths 

 of 250jjL, the organisms remain uninucleate and their cysts apparently 

 have a single membrane (43). Nuclearia Cienkowski (Fig. 5. 19, B-D) 

 includes uninucleate and multinucleate forms, either naked or with a 

 capsule through which the pseudopodia extend. Actinocoma Penard, as 

 represented by A. ramosa (Fig. 5. 19, A) is similar to noncapsulated uni- 

 nucleate forms of Nuclearia. These organisms apparently have little in 

 common with the plasmodia of Vampyrella and Leptomyxa. 



