REVIEWS. 
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skeleton of the larger treatise in a very convenient form for the use of 
students. In this little work, Mr. Hitchcock has abstracted from Prof. 
Leidy’s work the characters of the various groups, genera, and species, 
bringing them into the form of short definitions, but adhering, as far as 
possible, to the language of the original. The genera and species are 
tabulated. The work seems to have been most carefully executed ; 
and the little book, which consists of only sixty-four pages, including 
the introduction and index, will form a most excellent and portable hand- 
book, serving in fact in place of those notes which a student of lihizopods 
would like to make for himself of such a bulky volume as Prof. Leidy’s. 
The only thing that could add to its usefulness could be a couple of plates 
of outline figures illustrating the forms of animals described ; such figures 
are always a great assistance, especially to beginners. 
