Snp OS 
LIFE HISTORIES OF THE PROTOZOA. 731 
into circumscribed individual particles, appears to extend ever a 
large part of the bed of the ocean.” It should be stated that 
Thompson and others do not believe that Bathybius is really an 
organic being. Bathybius has been discovered at a depth of from 
fifty fathoms downward in the Adriatic Sea, by Oscar Schmidt. 
The Bathybius mud was detected by its yellowish-gray color and 
its characteristic greasy nature. 
nder the name of Protobathybius Dr. Bessels mentions a 
Moner allied to Bathybius, which is a non-nucleated mass of pro- 
toplasm. It was discovered at a depth of ninety fathoms, mud, in 
Polaris Bay, Northern Greenland. 
The Protogenes primordialis of Heckel is a simple, shapeless 
mass of protoplasm, without vacuoles, but with over 1000 very 
fine pseudopodia, with numerous ramifications and anastomoses. 
The largest specimens are ‘04 inch in diameter. It is a marine 
form, found at Nice. It reproduces by fission. 
Myxodictyum is made up of several individuals, each one of 
which is like Protogenes, but with fewer pseudopods. M. sociale 
Heckel, in the single specimen observed, formed a mass nearly an 
inch and a half in diameter, and was discovered in the Straits of 
Gibraltar. 
Protomonas amyli (Ckski.) is a fresh-water, monad-like form, 
found by Cienkowski in Germany and Russia, and is from -08 to 
-20 inch in diameter. Protomyza aurantiaca Heckel has vacuoles 
in its simple, shapeless, orange-red body, and in the encysted 
condition is a globular jelly-like mass over half an inch in diam- 
eter. It occurred on empty’ shells of Spirula Peronii, floating 
about on the open sea, and driven in on the coast of one of the 
Canary Islands. Vampyrella, as its name implies, is a jelly-like 
mass, which according to Cienkowski bores into the cells of con- 
fervæ and other fresh-water algæ, and sucks out their contents. 
Another species, V. vorax, engulfs diatoms, desmids and infusoria, 
drawing them into the interior of its body. 
The highest form among the Moners is Myzastrum radians of 
Heckel, which forms a radiating ball of jelly of tough consistence 
from -12 to -20 inch in diameter. It has very tough, stiff pseudo- 
pods. In the encysted condition it is nearly half an inch in di- 
ameter, and occurred on the beach of one of the Canary Islands. 
Development. In Protameba and Protogenes, Heckel tells us 
we find the simplest possible mode of reproduction. They mul- 
