EXPLANATION OF PLATE VIII. 



FIGS. 5-11. Cyclosalpa dolichosoma-virgula, chain form. Compare Fig. I. 



FIG. 5. Longitudinal vertical section of eye and ganglion, compounded from three 

 oblique sections. 



FIG. 6. Longitudinal section through the latero-ventral outgrowths from the gan- 

 glion and through one neural gland. 



FIG. 7. Cross-section through the eye near the tip. 



FIG. 8. Cross-section through middle of eye. 



FIG. 9. Cross-section through eye near the base. 



FIG. 10. Enlarged drawing of the section of the middle portion of the eye shown 

 in Fic. 5, to show group of spindle-shaped cells, q. 



FIG. II. Enlarged drawing of one of the groups of rod-cells in the peripheral cel- 

 lular layer of the ganglion. 



210 



