XIII. PROCHORDATA 
incl. ENTEROPNEUSTA 
Arranged by I, B, J, Sollas 
CONTENTS 
„ PAGE 
J. Titles 2 
II. Subject Index .. .. .. .. .. .. 4 
General=5003 . . . . . . . . . . . . 4 
Structure=5007 . . .. .. . . .. .. 4 
Physiology=501l .. .. .. .. .. 4 
Developme»t=5015 .. .. .. .. .. 4 
Variation and A etiology =5023 . . .. .. ’ 4 
Distribution, geographical and geological = 5027 .. 5 
III. Systematic Index=5031 . .. .. .. .. 5 
Tunicata . . . . . . . . . . . . . . 5 
Cephalochordata . . . . . . . . , . . . 7 
Enteropneusta . . • • . . . . . . . . 7 
(n-9720 c) 
(« i) 
