44 Sitst Annual Report 
15 
Figures 13 and 14. Heterostichus rostratus 
Fig. 13, Ventral view of viscera entire. Fig. 14, Alimentary canal of same. G, 
Liver. E, Spleen, J. Gonads. H, Heart. Numbers refer to corresponding regions 
of the alimentary canal. 
Figures 15 and 16. Gibbonsia elegans 
Fig. 15. Ventral view of viscera. Fig. 16, Alimentary canal removed. A, Liver. 
B, Spleen. D, Oviduct full of ova. Numbers refer to corresponding regions of 
alimentary canal. 
