XI. ARACHNIDA 
TO WHICH ARK ADDED 
GIGANTOSTRAOA (XIPHOSURA, TRILOBITA, EURYPTERIDA), 
PANTOPODA, TARDIGRADA, PENTASTOMIDA, MYRIOPODA 
and PROTOTRACHEATA 
ARRANGED BY 
R. SHELFORD 
CONTENTS 
PAGE 
Gigantostraca. 
I. Titles=2800 .. •• .. •• •• •• •• 4 
II. Subject-Index =2803-2827 : — 
Physiology =28 11 . . .. .. •• •• • • 6 
Distribution (Geological and Geographical) =282 7 .. 6 
III. Systematic = 2831 
Trilobita . . . . . . . . 7 
Xiphosura . . . . .. .. . . • • •• H 
Eurypterida .. .. . . . • . • •• ..11 
Pantopoda. 
I. Titles =2800 12 
II. Subject Index= 2803-2827. . .. .. .. .. 12 
.. 12 
c 6 
III. Systematic 
(N-9720n) 
