Bulletin of the Museum of Comparative Zoology, 



at Harvard College, CAMBRIDGE, Mass. 

 Vol. V. No. 11. 



ON SOME YOUNG STAGES IN THE DEVELOPMENT OF HIPPA, 

 PORCELLANA, AND PINNIXA. By W. Faxon. 



CAMBRIDGE: 



UNIVERSITY PRESS: JOHN WILSON & SON. 

 Junk,. 1879. 



