NERVOUS SYSTZM OF PYCNOGONIDS 465 



cleared so that the gangUa might be seen. Serial sections of 

 the whole animals were also made for study, but the chitin 

 often makes }:)erfect series impossible. Hoek and possibly 



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W 





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Figs. 1 to 7 Drawings from the adult nervous systems of a number of species 

 of California in'cuogonids. The supraesophageal ganglion is shown at the 

 upper end of the figures in everj' case. The nerves are not all shown in every 

 figure. All are shown from the ventral side, the ganglia were exposed by various 

 methods and all arc not drawn to quite the same scale. 



Fig. 1 Eurycyde spinosa, Hilton. 



Fig. 2 Halosoma viridintestinalis, Cole. 



Fig. 3 Tantystylum intermedium, Cole. 



Fig. 4 Ammothella tubercuata, Cole. 



Fig. 5 Pycnogonium stearnsi, Ives. 



Fig. 6 Palene californiensis, Hall. 



Fig. 7 Anophlodactylus orectus. Cole. 



