736 LIFE HISTORIES OF THE PROTOZOA. š 
that of Protomyxa, but differs in some important respects. The 
cyst becomes filled with numerous conical portions, whose points 
Fig. 130. rest towards the centre of the ball, while 
their rounded bases produce a mulberry- 
shaped outline externally... In the next 
stage these cone-shaped divisions have as- 
sumed a spindle shape, and each separate 
spore has developed a silicious covering 
(Fig. 130, A, a). When the spindle-shaped 
spore has been set free the protoplasmic con- 
tents (b) slip out of the silicious shell (Fig. 
130, B, a), and assume an Amæba form, with 
numerous radial pseudopods (Fig. 130, C), 
which in the fully formed Moner become as 
long as the diameter of the body. 
With the facts that have been presented, 
the question arises whether these moners are animals or vegetables. 
Structurally, and in their mode of development, the Monera would 
seem not to differ essentially from the lowest plants, such as the 
Myxomycetes and lowest Alge ; but physiologically, or in what 
they do, they differ, as H. J. Clark (Mind in Nature, p. 151, 156) 
says of Amoeba, in taking in living organisms entire, digesting 
their protoplasm and rejecting the silicious coverings of the dia- 
toms or infusoria they ‘have swallowed. The plants of corres- 
pondingly low organization on the contrary absorb only the ele- 
ments in an unorganized state. 
Development of Myx- 
astrum. 
LITERATURE, a 
eckel. Ueber den Sarcodekérper der Rhizopoden. (Siebold und Kölliker’s Zeits- 
chrift fiir naturwissenchaftliche Zoologie, xy. 1865. j 
——-—— Monographie der Moneren. (Jenaische Zeitschrift fiir Medicin w 
wissenschaft, iv. 1868, Translated in Quart. Journ. X icroscopical Science, 1569. 
Cienkowski a 
kopische Anatomie. Bd. 1. 1865. j 
uxley. On some Organisms living at great Depths in the North Atlantic Ocean (Ba 
thybius. (Quart. Journ. Mier. Sc.. viii. 1868.) 
II, THE GREGARINIDA. 
Structure and Habits. First discovered by Dufour, these para 
sitic protozoans, with an organ, 7. e., a nucleus, were considered as 
the lowest animals until the discovery by Heckel of the still sım- 
pler Monera. It is now known that they pass through the Moner- 
state and attain a true Amoeba condition, having an outer, clear, 
