AUTHOR’S ABSTRACT OF THIS PAPER ISSUED BY 
THE BIBLIOGRAPHIC SERVICE, DECEMBER 22 
THE PHYSIOLOGY OF ASCIDIA ATRA LESUEUR! 
I. GENERAL PHYSIOLOGY 
SELIG HECHT 
FIFTEEN FIGURES 
CONTENTS 
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I. INTRODUCTION 
Ascidia atra is a large tunicate common in Bermuda and the 
West Indies. It was first described from Guadaloupe in 1823 
by Lesueur.. Many years later it. was found in Bermuda by the 
Challenger Expedition, and figured by Herdman (’82), who, 
however, confused it with the European form Ascidia nigra Sav. 
The distinction between the two is that the European species 
possesses intermediate papillae on the longitudinal bars of the 
branchial sac, while the American species does not (VanName, 
+02). 
1Contributions from the Zodlogical Laboratory of the Museum of Compara- 
tive Zoélogy at Harvard College, No. 303, and contributions from the Bermuda 
Biological Station for Research, No. 78. 
229 
