BIBLIOGRAPHY 321 



Orton, J. H. Journ. Mar. Biol. Assoc, X (N.S.), No. 2. June, 



1914. 



Nature. Dec. 23, 1920. 



OsBORN, H. F. The Origin and Evolution of Life. London, 



1918. 



Parker. G. H. The Elementary Nervous System. Mono- 

 graphs on Exp. Biol. Philadelphia and London, 1918. 



Paul, J. H. Proc. Roy. Soc. Edin., XXXV. 1914. 



Proc. Roy. Soc. Edin., XXXV, Part III, No. 23. Edin- 

 burgh, 1915. 



Pearse, a. S. Bull. Wisconsin Nat. Hist. Soc, XI (N.S.). 

 June, 1913. 



Bull. Wisconsin Nat. Hist. Soc, XII (N.S.). June, 



1914. 



Proc. U.S. Nat. Mus., XI. 1915. 



Pearson, J. Liverp. Mar. Biol. Cttee. Memoir XVI, Cancer. 

 1908. 



Pelseneer, P, a Treatise on Zoology (Edited by Sir E. Ray 

 Lankester), Part V. London, 1906. 



Ann. de la Soc. Zool. et Malac. de Beige, XLIII. 1914. 



Perez, C. Proc. Verb. Soc. Sci. Bordeaux, 1903. 



Petersen, C. G. J., and Jensen, P. Boysen. Valuation of the 

 Sea. R^pt. Dan. Biol. Sta., XX. Copenhagen, 191 1. 



Pethybridge, G. H. Journ. Bd. Agric, Ireland, XX. 1915. 



PiERON, H. C. R. Soc Biol. May, 1907. 



Arch. Zool. exp. Ser. 5, I. 1909. 



Plateau, F. Journ de I'Anat. et Phys., 26. 1890. 



Plessner, H. Zool. Jahrb,, XXIII. 1913. 



Potts, F. A. Quart. Journ. Micros. Sci., L. 1906. 



Proc Camb. Phil. Soc, XVII. 1914. 



PouLTON, E. B. The Colours of Animals. Internat. Sci. 

 Ser. London, 1890. 



Prouho, H. C. R. Acad. des. Sci., CXI. Paris, 1890. 



Putter, A. Zeitschr. f. allgemein. Physiol., Bd. VII, Heft. 2-3. 

 1907. 



Abhandl. Gesell. der Wissensch, Gottingen, Bd. VI. 



1908. 



Quatrefages, a. de. Ann. des Sci. Nat., 2 Ser. Zool., Tome 17. 

 1842. 



ROAF, H. E. Journ. Physiol., XXXIX. 1910. 



Robert, A. Bull. Soc. Zool., France, Tome XXXIII. 1908. 



Russell, G. S. Proc. Zool. Soc. London, 1907. 



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