li!°.o 



MEMOIRS 



OF THK 



BOSTON SOCIETY OF NATURAL HISTORY; 



VOLUME IV, NUMBER VIII. 



PHYLOGENY OF THE PELECYPODA, 



THE AVICULIDiE AND THEIR ALLIES. 



PLATES XXIII— XXX. 



By ROBERT TRACY JACKSON, S. D. 



BOSTON : 



PUin.ISHED BT THE SOCIETY. 



July, 1890. 



SMfiloo of MoSofite 



Sectional librcoy 



V 



