2 
Arachnida (incl. Tardigrada and Pentastomida). 
I. Titles =3000 
II. Subject-Index = 3003-3027 : — 
General, Economics . . 
Structure 
Physiology 
Development. . 
Ethology 
Variation and Aetiology . . 
Distribution (Geographical and Geological) 
III. Systematic = 3031 : — 
General 
Scorpiones 
Pedipalpi 
Palpigvadi [vacant] 
Araneae 
Aviculariidae 
Uloboridae 
Psechridae 
Zoropsidae 
Dictynidae. . 
Eresidae 
Oonopidae . . 
Sicariidao 
Leptonetidae 
Dysderi ae 
Drassidae . . 
Palpimanidae 
Zodariidae 
Urocteidae 
Ammoxenidae 
Pholcidae 
Theridiidae 
Argiopidae , . 
Thomisidae 
Clubionidae 
AgelenHue 
Pisauridae 
Lycosidae . . . . . . . . 
Oxyopidae.. 
Salticidao 
Solifugae 
Pseudoscorpiones . . 
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