FEEDING REACTIONS IN DILEPTUS GIGAS. 



139 



almost spherical in shape when under pressure from the cover- 

 glass. 



In all my work it has been impossible to observe any structures 

 or formed elements of any kind which could be identified as tricho- 

 cysts or their contents outside the body of Dilcptus. The safranin 



FIG. 7. Camera lucida drawings from preparations fixed in Schaudinn's 

 fluid and stained with Fe-Haem. (A-D) or with acid borax carmine (). 

 A, B, C, and D are 4 /A serial sections of a proboscis. Note size, shape, and 

 number of trichocysts (0 ; the pharyngeal rods (r) ; cilia (c) ; basal granules 

 (g) "distributed nucleus," some of which are designated as n; and the con- 

 tractile, fibrillae (/). E, proboscis of dileptus, slightly twisted; from an entire 

 mount. Note relative number and position of trichocysts (*), forming a band 

 on the oral surface of the proboscis. Due to the turn in the proboscis, the 

 trichocysts are seen from side view at a and c and from end view at b and d. 



