2 
Arachnida (incl. Tardigrada and Pentastomida). 
I. Titles=3000 . . .. .. .. 
II. Subject-Index =3003-3027 : — 
General, Economics . . 
Structure 
Physiology f 
Development. 
Ethology .. ., f . , . 
Variation and Aetiology . . 
Distribution (Geographical and Geological) 
III. Systematic = 3031 : — 
General [vacant] 
Scorpiones 
Pedipalpi 
Palpigradi [vacant] 
Araneae 
Aviculariidae 
Atypidae . . 
Dictynidae. . 
Oonopidae . . 
Leptonetidae 
Zodariidae . . 
Theridiidae 
Argiopidae 
Thomiaidae 
Clubionidae . . . . , • 
Agelenidae . . . . . * 
Pisauridae 
Lycosidae . . 
Oxyopidae . . 
Salticidae . . 
Solifugae 
Pseudoscorpiones . . 
Opiliones 
Acari 
Oribatidae, etc. 
Gamasidae. . 
Ixodidae and Argasidae . . 
Trombidiidae, etc. 
Hydrachnidae 
Halaearidae 
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