30 ZOOLOGY. 
already described. This moner-like being, without a 
nucleus, is the young Gregarina. 
But soon the Ameeba characters arise. The moner-like 
young (Fig. 18, D # F) now undergoes a further change. Its 
outer portion becomes a thick layer of a brilliant, perfectly 
homogeneous protoplasm, entirely free from granules, which 
surrounds the central granular contents of the cytode 
(Haeckel) or non-nucleated cell. This is the Ameba stage 
of the young Gregarina, the body, as in the Amba, con- 
sisting of a clear, cortical, and granular 
medullary or central portion. 
The next step is the appearance of two: 
arm-like projections (Fig. 18, /’), com- 
parable to the pseudopods of an Ameeba. 
One of these arms elongates, and, sepa- 
rating, forms a perfect Gregarina. Soon 
afterward the other arm elongates, ab- 
sorbs the moner-like mass, and also be- 
comes a perfect Gregarina. This elon- 
gated stage is called a Pseudofilaria (Fig.. 
18, G); no nucleus has yet appeared. 
3 In the next stage (Fig. 18, Hn, nucleus) 
Homiiecsee aes the body is shorter and broader, and the 
peetle, Cp aemer state, NUCleus appears, while a number of gran- 
with a beak-like continaa- yleg collect at one end, indicating a 
gube & entertac aul) head. After this the 
elder} @, ante epee; Dead. er this the body shortens a 
¢, nucleus—After Gegen- little more (J, J), and then attains the 
elongated, worm-like form of the adult. 
Gregarina (Z). Van Beneden thus sums up the phases of 
growth : 
The Moner phase. 
The generating Cytode phase. 
The Pseudofilaria phase. 
The Protoplast (adult Gregarina). 
The encysted Gregarina. 
The sporogony phase (producing zoospores). 
SS SU G8 80: 
The Gregarine and Amcebex constitute Haeckel’s group 
