JOURNAL OF ENTOMOLOGY AND ZOOLOGY 117 
and the more recent branchiopods. The body of the eurypterid 
is rather fish-like in shape and has a carapace or head-shield. 
It is generally believed that it was fitted either for crawling, 
digging or swimming. It is supposed that it was rather 
sluggish. 
The work is published in two large volumes. The first part 
contains an account of the characteristics, development and 
habits of the creatures, as well as a description of the different 
genera and species. The second volume is made up of many 
fine plates and figures. 
Elizabeth Jacks. 
DIE CORPORA ALLATA DER INSEKTEN 
ARTHUR NABERT 
Zeit f. Wiss. Zool. CIV Bd., 2 Heft, 1913. 
These organs are glands with an internal secretion found in 
all groups of insects and may be paired or unpaired. In shape 
they are like a bullet or oval in outline, but may develop a 
hilum on one side. They are generally closely associated with 
the pharyngeal ganglia which lie along the esophagus. Usually 
they bear a certain relation to the aorta, to a tracheal vessel 
and the esophagus. They are inervated by the nervus corpis 
allati from the side of each of the pharyngeal ganglia. 
BOOK REVIEWS 
Princretes oF Economic Zootoey. L. 8. and M. C. Daugherty. 
410 pages, with 301 illustrations. W. B. Saunders Com- 
pany, 1912. Text $2.00; Guide $1.25. Cloth. 
This is intended as a text-book of zoology, with especial ref- 
erence to the economic side of the subject. The various phyla 
are taken up in order and a general description of each is 
given, as well as descriptions of the chief subdivisions, with 
brief discussions of the habits and economic importance. There 
are many examples given, with descriptions and discussions, 
