Plate IV. 



Fig. 1. MiCKOcoTYLE SEBASTis. Median sagittal section of the pharynx. 

 X 305 diam. 

 „ 2. MiCKocoTYLE RETICULATA. Median portion of a CTOss-section of tLc 



body through about the middle of tlie pharynx, x 204 diam. 

 „ 3. The SAME. Horizontal (optic) section of the pharynx, showing the 



muscles ; from a small individual, x 305 diam. 

 „ 4. MicEocoTYLE SEBASTIS, Longitudiual sBction of the ootyp, showing 



the shell-glands, x 305 diam. 

 „ 5. T H E s A M E. One-half of the cross-section of the body just through the 



anterior end of the brain ; to show the nerve cells (a), x 305 diam. 

 „ 6. MicEocoTYLE FusiFOEMis. A cross-sBction of the body at the level 



of the origin of the posterior nerves, x 305 diam. 

 „ 7. MicEocoTYLE cAUDATA. Latcval portion of a cross-section of the 



body. X 305 diam. 

 „ 8. The SAME. Median portion of a cross-section of the body through, the 



region of the ovary. The yolk-duct was filled with yolk-cells, but these are 



not drawn in thefigure. x 305 diam. 

 „ 9. The SAME. A portion of the section of the ovary near the oviduct end. 



X 305 diam. 



