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BIBLIOGRAPHY. 
Tue following is merely a list of works (books and papers) 
referred to in Vols. I-IV of the present Monograph. The 
entries are extracted from a Bibliography which is now about 
four times the length of this, and will, in all probability, be 
considerably added to. 
The pages, plates, and text-figures enumerated are those 
of the complete papers, whether they deal entirely with the 
Freshwater Rhizopoda or only in part. The pages in which 
are references to them, and the plates and text-figures illus- 
trating them, are not separately enumerated, as is done in 
the writer’s ‘Bibliography of the Tunicata,’ for all such 
references are given in the synonymies; nor are abstracts, 
notices, or reviews of original papers or books, as in that 
work; for it is only intended to give titles of papers, which 
are not given in the synonymies of genera and species, and 
fuller titles of the books with their place of publication, etc. 
This has considerably shortened the list. A few papers 
referred to which treat almost entirely of the Heliozoa are not 
entered; they will be found in the Bibliography of the 
Heliozoa in the next volume. 
The three following paragraphs, quoted from the above- 
named work, apply also to this Bibliography. 
“‘ With an alphabetical arrangement of the names of authors, 
the sequence of their works is chronological so far as could 
be ascertained. When more than one in the same year it is 
alphabetical under the first word in the title, except when 
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