448 



BIOLOGY OF THE PROTOZOA 



from all other Mycetozoa in that not even a pseudoplasmodium is 

 formed, a single ameba going through all the motions of a Plas- 

 modium. Stalk and cyst are formed by one individual but the cysts 

 are frequently massed in sporangium-like groups (Fig. 185). The 

 species S. diploidea, originally named Amoeba diploidea by Hart- 



C 



D 



Fig. 185. — Dictyoslelium, A, and Sappinia, B, C, D. (After Doflein.) 



maim and Nagler, is much like Umax types of ameba. Both 

 S. diploidea and S. pedata Dangeard are binucleated, a condition 

 which arises as the result of the peculiar copulation process shown 

 by S. diploidea (see p. 323). 



Family 2. Guttulinidae Cienkowsky.— These are small forms 

 which bear stalked or unstalked fruiting bodies covered with 



