

Memoirs of tbt ^l^useuin of Comj^arutibc ioblogn 



AT HARVARD COLLEGE. 

 Vol. XXVI. No. 2. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, BY THE 

 U. S. FISH COMMISSION STEAMER « ALBATROSS," FROM AUGUST, 

 1899, TO MARCH, 1900, COMMANDER JEFFERSON F. MOSER, U. S. N., 

 COMMANDING. 



II. 



SOME SPECIES OF PARTULA FROM TAHITI. 



A STUDY IN VARIATION. 



Bt ALFRED GOLDSBOROUGH MAYER. 



/w 



ITH 0.\E PLATE. 



[Published by permission of George M. Bowers, U. S. Commissioner of Fish and Fisheries.] 



CAMBRIDGE, U. S. A. : 



3Prtntcti for ti)e lluscum. 



"January, 1902. 



