JHemoirs from the fitolociical Caboratorj) 



OF THE 



JOHNS HOPKINS UNIVERSITY 



II 



THE GENUS SALPA 



A MONOGRAPH WITH FIFTY-SEVEN PLATES 



BY 



WILLIAM K. BROOKS, PH. D., LL. D. 



Professor in the Johns ffopJcins University and Director of its Marine Laboratory 



WITH A SUPPLEMENTARY PAPER BY 

 MAYNARD M. METCALF 



Fellow of the Johns Hopkins University 



BALTIMORE 



THE JOHNS HOPKINS PRESS 

 1893 



