108 THE NAUTILUS. 



THE HOMING HABITS OF THE PULMONATE MOLLUSK ONCHIDIUM. 

 By L. B. Arey and W. J. Crozier (Proc. Nat. Acad. Sci., vol. 4, 

 pp. 319-321, 1918). 



GROWTH AND DURATION OF LIFE OF CHITON TUBERCULATUS 

 AND GROWTH OF CHITON TUBERCULATUS IN DIFFERENT ENVIR- 

 ONMENTS [2 papers]. By W. J. Crozier (Proc. Nat. Acad. Sci., 

 vol. 4, pp. 322-328, 1918). 



THE NAYADES (FRESH WATER MUSSELS) OF THE UPPER TENN- 

 ESSEE DRAINAGE, WITH NOTES ON SYNONYMY AND DISTRIBUTION. 

 By A. E. Ortmann (Proc. Amer. Phil. Soc., vol. 67, pp. 521- 

 626, 1918). Exhaustive studies of this character of the mol- 

 luscan fauna of our rivers constitutes one of the most important 

 works in biology. The constantly increasing pollution of our 

 streams will locally exterminate many species. The author 

 says: "The region in question is known as one of the chief 

 centers of nayad development, and may be called the most pro- 

 lific section of the world in this particular group." The species 

 often assume different shapes in the larger rivers than in the 

 smaller streams and headwaters. Some 88 species and varieties 

 are recorded from this drainage. C. W. J. 



Los MOLUSCOS DE LA REPUBLiCA DE PANAMA por James Zetek 

 (Revista Nueva, Jul.-Aug., 1918). This catalogue of the mol- 

 lusks is prefaced by a discussion of the distribution, peculiari- 

 ties of the fauna, etc. , and followed by a list of synonyms and 

 a bibliography. Besides having many species additional to 

 those of C. B. Adams's well-known catalogue, it has the advan- 

 tage of modern nomenclature. 



CEPHALOPODA, AUSTRALIAN ANTARCTIC EXPEDITION. By S. 

 S. Berry. A new species of Stauroteuthis and four of Moschites 

 are described and well figured in this interesting report. 



