INTRODUCTION. 27 
and showed also a nucleus and nucleolus, and a con- 
tractile vesicle, the latter mostly posterior.* Gradually 
these bodies settled down. In place of the vigorous 
amceboid contractions of the whole body, merely 
hyaline lobes or finger-like processes were extended ; 
as they contracted one by one into a globular sub- 
pyriform figure, a resting-state set in; then a long 
vibrating filament was projected from the body, and 
the metamorphosis of the amcebula into a flagellate 
spore was complete. The author did not follow their 
development further. They were not, he considered, 
In any sense parasitic, but had their origin in the 
peculiar “shining bodies” (glanzkorper) which occur 
in large numbers, along with the small nuclei, in the 
plasma-body of Pelomyxa. These shining bodies are of 
roundish, ovoid, or irregular figure, and glossy appear- 
ance. In an individual not very highly charged with 
extraneous matter they may readily be detected. 
From these remarks it will be seen how diverse are 
the forms under which reproduction takes place in the 
simple-celled Rhizopoda. The Heliozoa present no 
essential difference; but these will be more con- 
veniently dealt with under their own proper head. 
It may not be out of place to allude here to the 
theory of Weismann and others of the “ deathlessness ” 
of the Protozoan cell, thus expounded by Prof. Ray 
Lankester: + “ It results from the constitution of the 
Protozoan body as a single cell, and its multiplication 
by fission, that death has no place as a natural re- 
current phenomenon among these organisms. Among 
the Enterozoa certain cells are separated from the rest 
of the constituent units of the body as egg-cells and 
sperm-cells ;~these conjugate and continue to live, 
whilst the remaining cells, the mere carriers as it were 
of the immortal reproductive cells, die and disintegrate. 
There being no carrying cells which surround, feed, 
and nurse the reproductive cells of Protozoa, but the 
* © Arch. f. Mikr. Anat.,’ x, p. 51. 
+ “Protozoa,” in ‘Encyclopedia Britannica, 9th ed. XIX (1885). 
