XIII. PROCHORDATA 
INCLUDING 
ENTEROPNEUSTA AND PTEROBRANCHIA 
ARRANGED BY 
C. TATE REGAN 
CONTENTS 
PAGE 
J. Titles 2 
II. Subject-Index : — 
General ... ... ... ... ... ... ... 2 
Structure ... ... ... ... ... ... ... 3 
Development ... ... ... ... ... ... 3 
Ethology 3 
Distribution ... 3 
III. Systematic Index : — 
Tunicata ... ... ... ... ... ... ... 3 
Cephalochordata (vacant) 
Enteropneusta and Pterobranchia ... ... ... 3 
b 1 
(n-8913 c) 
