Arachn * 1 
II. ARACHNIDA. 
BY 
Albert William Brown. 
CONTENTS. 
Introduction 
I. TITLE3 
II. Biology: Subject Index. 
Anatomy, &c. 
1. General, Scorpiones, 
Pedipalpi, Solifugre, 
Pseudoscorpiones, 
Opiliones 
2. Aranern 
3. Acari 
Distribution 
Page 
1 
2 
7 
8 
8 
8 
III. Systematic. 
Scorpiones 
Pedipalpi (vacant). 
Araneas 
Solifugm 
Pseudoscorpiones . . . 
Opiliones 
Acari 
Page 
9 
10 
10 
1G 
1G 
1G 
INTRODUCTION. 
Our knowledge of the Morphology and Embryology of the Araclimda 
has advanced considerably during the year. Laurie has published two 
important papers, giving an account of the anatomy and development of 
Scorpions as a basis for classification, and Bernard has written a lengthy 
and valuable memoir on the Comparative Morphology of the Galeodidai. 
Tarnarni has dealt with the same subject as regards Thelyphonm . 
Causard has described the result of his investigations, by means of 
injection, into the anatomy of the circulatory system of Spiders ; whilst 
Wagner has made an important study of Spermatogenesis in the same 
group. Reeker’s papers on the life of Spiders are of interest. 
As a result of the Horn Expedition * to Central Australia, Hogg has 
heen able to make considerable additions to our knowledge of the 
Ai 'anew of that region. 
Amongst other papers on Spiders, may be mentioned F. O. Pickard 
Cambridge’s description of the Theraphosidm of the Amazons, G. W. & 
E. G. Peckham’s memoir on the Attidce of Central America, and Bald- 
win Spencer’s short, but interesting, account of the stridulating organs' 
189G. [vol. xxxiil] d 8 
