Arachn. 1 
XI. ARACHNIDA. 
BY 
Albert Wm. Brown, B.A., F.L.S. 
Christ Church , Oxford. 
CONTENTS. 
Page 
Introduction.1 
I. Titles.2 
II. Biology. 
1. Anatomy & Physiology 8 
2. Embryology & Evolu¬ 
tion .8 
3. Classification & Nomen¬ 
clature .8 
4. Habits & Distribution . 8 
III. Distribution.9 
Page 
IV. Systematic. 
Scorpiones.14 
Pedipalpi.15 
Aranese.15 
Solifugse.23 
Pseudoscorpiones . . . . 25 
Opiliones.25 
Acari.26 
Tardigrada (vacant) 
INTRODUCTION. 
The Record of Arachnida, like that of Crustacea, again shows a slight 
decline in the number of papers published during the year, but from one 
point of view, the decline is of small consequence for, whatever the number 
of papers published on this group, the number of species described 
remains approximately constant. 
The Recorder has, for some years past, emphasised the lack of agree¬ 
ment amongst authors on the classification of the Araneae and has pointed 
out the difficulty of dealing satisfactorily with the nomenclature of the 
group. He has now come to the conclusion that the workers on the 
group would find a simple alphabetical arrangement of the Spiders of far 
more use to them than the system hitherto adopted of arranging the 
Araneae in families. He finds that, in spite of great care having 
been taken in the compilation of previous Records, inconsistencies, 
more annoying than serious, have managed to creep in. Thus the same 
genus occasionally appears under two families owing to its being so placed by 
two distinct writers. Whilst not desiring to excuse in any way the over¬ 
sights on his part which have led to this confusion, the Recorder feels 
that, until a more general agreement amongst Arachnologists is arrived 
at, it is better to ignore the family-arrangement altogether. 
