Vol. Vllt, pp. 71-82. pls. X, XI 



PROCEEDINGS 



July 13, 1893 



BIOLOGICAL SOCIETY OF WASHINGTON, 



DEVELOPMENT OF THE BRACHIAL SUP- 

 PORTS IN DIELASMA AND 

 ZYGOSPIRA 



CHARLES E. BEECHER and CHARLES SCHUCHERT 



ON THE DEVELOPMENT OF THE SHELL OF 

 ZYGOSPIRA RECURVIROSTRA 



CHARLES SCHUCHERT 



WASHINGTON, D. C. 



Published by the Biological Society of Washington 



