354 ARACHNIDA 



ORDER II. PEDIPALPI 



The Pedipalpi (' whip-scorpions/ etc.) are represented 

 by Geralinura and Prothelyphonus in the Carboniferous, 

 and by Phrynus in the Tertiary rocks. 



ORDER III. ARANEIDA 



Spiders belonging to the genera Protolycosa, Arthroly- 

 cosa, etc., are found in the Coal Measures. In the 

 Oligocene — especially in the amber of Prussia — a large 

 number of forms occur. 



ORDER IV. PSEUDOSCORPIONIDA (CHERNETIDIA) 



This Order includes the ' book-scorpions ' (Chelifer) 

 and others. Various forms, belonging to existing genera, 

 occur in the Oligocene amber, e.g. Chelifer, Cherries. 



ORDER V. PHALANGIDEA (OPILIONINA) 



Examples of this Order (' harvest-men,' etc.) have been 

 found in the Oligocene amber. 



The following genera found in the Carboniferous rocks 

 are referred by some writers to the Phalangidea, but are 

 regarded by others as belonging to a distinct Order — the 

 Anthracomarti : — Architarbus, Anthracomartus, Krei- 

 scheria, Eophrynus, Anthracosiro. 



ORDER VI. ACARINA 



This Order comprises the mites and ticks. Various 

 forms of mites, belonging chiefly to living genera, occur in 

 the Oligocene amber and other Tertiary deposits. 



