CasTLE, — Rhynchobdellide, 
PLATE 2. 
Fig. 4. G@. stagnalis. Diagram showing annulation, central nervous system, repro- 
ductive organs (male in left, female in right half of figure), nephropores, 
etc. The outline of the body was drawn from a whole preparation (X 
about 16); everything else is diagrammatic, representing the average 
form and position of organs as determined by examination and com- 
parison of several individuals. 
Fig. 5. Brain of G. elegans, ventral view. From an entire preparation. X 52. 
Fig. 6. G. parasitica. Dorsal view of a young individual from Havana, Illinois, 
partially extended. X about 10. The starlike structures indicate 
papille ; not all of those shown were observed in the individual figured, 
some being supplied from the study of larger individuals in which the 
papille are more conspicuous. 
