PLATE 2. 



Fig. 11. — A portion of the furca (/"«.) and bristles (fu. hr.) of a 

 female Cyclops alhidus, showing the nerve-like strand in the longer bristle 

 and the nuclei {nu.) in the strand. X 365; Zenker fixation, stained in 

 haematoxylin. 



Figs. 12, 13, 14. — Rostral prongs {ro.) seen in lateral view, showing the 

 nerve fibrils {n. f. per.) passing to them. Fig. 14 shows the nerve cell 

 {n. c.) from which the fibres arise, (n. f. en.), central nerve fibres. All 

 the figures, X 800. Fig 12 from a preparation by the corrosive sublimate 

 alcohol method. Figs. 13, 14 from methylal preparations. 



[121 



