2 
Arachnida (ind. Tardigrada and Pentastomida). 
I, Titles=3000 . . .. .. .. 
IT. SuiiJECT-lNDBX =3003-3027 : — 
General, Economics . . 
Structure . . 
Physiology . . . . . , 
Development. . 
Ethology . . . . 
Variation and Aetiology . . 
Distribution (Geographical) 
III. Systematic Jndex = 3031 : — 
General (vacant). 
Scorpiones . . 
Peclipalpi . , . • . 
Palpigradi (vacant). 
Araneae . . . . 
Aviculariidae 
Uloboridae 
Dictynidae. . 
Prodidomidae 
Drassidae . . 
Palpimanidae 
Zodariidae. . 
flersiliidae 
Pholcidae ... 
Theridiidae 
Argiopidae 
Archaeidae 
Thomisidae 
Clubionidae 
Agelenidae 
Pisam idae . . 
Lycosidae . , 
Salticidae . . 
Solifugae 
Pseudoscorpiones . , 
Opiliones 
Uicinulei, etc. (vacant). 
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