NERVOUS SYSTEM OF PYCNOGONIDS 



465 



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

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

 often makes perfect series impossible. Hoek and possibly 



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'lit 





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a 





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SSNS^' 



v^ 





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

 of California pycnogonids. The supraesophageal ganglion is shown at the 

 upper end of the figures in every 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 are 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 erectus, Cole. 



