Arachn. 1 
XI. ARACHNIDA 
(Including TARDIGRADA and PENTASTOMIDA). 
BY 
Albert Brown. 
CONTENTS. 
Page 
Introduction. 1 
I. Titles.2 
II. Biology. 
1. Morphology ... 14 
2. Physiology.14 
3. Life History . . . . 15 
4. Classification, Phylogeny 
and Nomenclature . 15 
5. Habits, etc., Parasitic, 
Commensal & Other 
Relations . . . . 15 
6. Miscellaneous . . .16 
I. Distribution. 
Page 
16 
T. Systematic. 
Scorpiones . . . 
.... 23 
Pedipalpi . . . 
.... 24 
Palpigradi . . . 
... 24 
Araneee .... 
.... 24 
Solifugse . . . 
.... 42 
Pseudoscorpiones 
.... 42 
Opiliones . . . 
.... 42 
Acari .... 
.... 43 
Tardigrada . . 
.... 47 
Pentastomida 
.... 47 
INTRODUCTION. 
The Record of Arachnida for 1901 is the largest yet published. From 
1896 to 1900 the average number of papers published in one year amounted 
to something between 120 and 130, and although the following Record 
contains a number of papers published not in 1901 but in previous years, 
the increase after making allowance for this is still remarkable. 
A superficial examination shows that a large proportion of the Record 
relates to the Aranece and that the Acari have not received so much 
attention as usual. The literature of the other groups remains much 
the same in quantity. 
