DESCRIPTION OF PLATES. 129 
remnants of former meals. The protoplasm itself 
presents, however, a slightly granular appearance 
under high powers. 
The Amoebze belong to a class of microscopic 
animals which includes a vast number of species, 
known as Rhizopods, or root-footed animals (riza, 
root ; pous, foot). ; 
The Rhizopods are aquatic in their habits, and 
a large number of the species are found in salt 
water. 
For fuller information in regard to these cu- 
rious and interesting creatures, the reader is 
referred to Dr. Carpenter's comprehensive work, 
“The Microscope and its Revelations,’ and to 
the magnificent memoir of Dr. Leidy, “ Fresh- 
water Rhizopods of North America,’ which con- 
stitutes Vol. XII. of Professor Hayden’s Report, 
United States Geological Survey of the Territories. 
An excellent synopsis of this work has been com- 
piled by Romyn Hitchcock, F.R.M.S1 Those who 
are unable to purchase the work of Professor Leidy 
will do well to consult it in the nearest scientific 
library, for the purpose of examining the beauti- 
ful plates by which it is illustrated. An hour 
spent in this way will give a better idea of the 
variety of forms and general appearance of these 
lowly creatures than can be obtained in any other 
way, except by seeking for them in their favorite 
haunts, as Professor Leidy has done, and by exam- 
ining the living specimens under the microscope. 
1 Editor and publisher of the ‘‘ American Monthly Microscopical 
Journal,’’ 51 and 53 Maiden Lane, New York. 
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