XI. ARACHNIDA 
TO WHICH ARE ADDED 
GIGANTOSTRACA (XIPIIOSURA, TRILOBITA, EURYFTERIDA), 
PANTOPODA, TARDIGRADA, PENTASTOMIDA, MYRIOPODA 
and PROTOTRACllEATA 
ARRANGED BY 
]l. SIIEF/EORD 
CONTENTS 
PAGE 
Gigantostraca. 
I. Titles = 2800 4 
II. Subject-Index=2810-2827. . .. .. .. .. 5 
ill. Systematic = 2831 : — 
Trilobita . . . . . . . . . . . . . . 6 
Xiphosura . . . . . . . . . . . . . . 7 
Pantopoda. 
I. Titles = 2800 8 
IF. Subject Index = 2807-2827. . .. .. .. .. 8 
III. Systematic = 2831 .. .. .. .. .. 8 
(n- 10332 71) c 7 
