200 F. G. HBATHCOTB. 



section is in front of Fig. 4. (Zeiss's d objective.) se. Sense epithelium. 

 eh. Chitinous lining of the organ, iff. Hypodermis. 



Fig. 6. — Tailed cell from sense epithelium at top of median recess. Bi, 

 Bifurcated end. oe. Outer end. (Zeiss's r objectiye.) 



Fig. 7. — Sense cells from epithelium (se.). oe. Outer end of cell. 

 (Zeiss's F objective.) 



• Fig. 8. — Surface view of chitinous lining of pouch seen from the internal 

 side, showing the projecting bases of the chitinous hairs, bh. Base of hair 

 projecting through the chitin. (Zeiss's water immersion L objective.) 



Fig. 9. — Chitinous hs^ir under high power. (Zeiss's l water immersion.) 

 bp. Basal part of hair. BA. Part of the basal piece which projects through 

 the chitinous lining of the pouch towards the interior, fi. The hair itself 

 projecting into the interior of the pouch.. 



