XIII. PROCHORDATA 
INCLUDING 
ENTEROPNEUSTA AND PTEROBRANCHI A 
ARRANGED BY 
C. TATE REGAN 
CONTENTS 
I. 
Titles 
PAGE 
2 
II. 
Subject-Index : — 
General 
3 
Structure ... 
3 
Physiology 
3 
Development 
3 
Variation ... 
3 
Distribution 
3 
III. 
Systematic Index: — 
Tunicata ... 
3 
Cephalochordata ... 
4 
Enteropneusta and Pterobranchia 
4 
(n-8962 c) d 1 
