The Development 



of a 



Mollusk 



A Guide to the Series of Models 



Illustrating the Development of Crepidula 



in the 

 Department of Invertebrate Zoology 



By 

 B. E. DAHLGREN, D. M. D. 



American Museum of Natural History 



GUIDE LEAFLET No. 21. 



REPRINTED FROM THE AMERICAN MUSEUM JOURNAL, 

 Volume VI, Nt). i, January, igo6. 

 New Vork. Published by the Museum. 



