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Pomona College Journ-il op Entomology 



abundance of hair are found to some degree living in similar situations, but 

 plume-like setae are found in many different groups of Arthropods, and in 

 certain families such as the Therophosidse and Thrombidiidffi, they are very 

 marked. 



12 



u 



Figure 256. Setae from spiders and Limulus 



All are enlarged 325 times. 1 and 2, liairs from the leg of one of the Lycosidae, the 

 base of 2 is shown; 3, 4 and 5, setae from one of the Epeiridae, the bases of 3 

 and 4 are shown; 6, 7 and 8, hairs from one of the Thonididae: 9, one of the very 

 few phinie-like hairs from one of the .-\galaendae; 10, 11 and 12, setae and parts 

 of setae from Limulus. 



Among artiiro])()ds tliere has been, in the past, evidence from the Golgi 

 and methylene l)hie methods that nerve fibres from bipolar sense cells pene- 

 trate seUv; some of the evidence by Bethe ('96), Duboscq. Holmgren ('98), 

 Schreiber ('98) and many others. Some Golgi preiKirations gave impregna- 

 tion results which seemed to show tliat the whoh- hollow of the liiiir was filled 



