JOUKNAL 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 titted 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. Tlie second volume is made up of many 

 fine plates and figures. 



Elizabeth Jacks. 



DIE CORPORA ALLATA DER INSEKTEN 



ARTHUR NABERT 



Zeit f. Wiss. Zool. CTV 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 wliich 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 



Principles of Economic Zoology. L. S. 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, 



