Plate XVH. 



M O N C T Y L E I J I M A E . 



Fig. 1. The whole worm viewed from the ventral side ; from a specimen killed 



under the pressure of a cover-slip. The body is therefore represented a 



little broader than it really is. With the nervous system shaded with 



parallel lines. 

 „ 2. The same with the excretory system. 

 „ 3. A portion of the radial section of the posterior sucker along one of the 



radial spokes, x 305 diam. 

 „ i. Cross-section of the body and sut;ker through the stalk of the latter. 



X 73 diam. 

 „ 5. Median sagittal section of the same, x 73 diam. 

 ,, (J. A small portion of tlie part marked ///. in fig. 5, to show the sticky glands. 



X 305 diam. 

 „ 7. Striated muscular fibres of the sucker, x 305 diam. 

 ,, 8. Cross-section of one of the radial spokes of the posterior sucker. x 305 



diam. 

 ,, 9. A small portion of a horizontal optic section of the sucker. x 305 diam- 



The white irregular patches represent the optic sections of the muscular 



libres. 

 „ 10. One of the hooks of the sucker, x 305 diam. 



„ 11. A small portion of the intestinal epithelium in surface view, x 305. diam. 

 ,, 12. A portion of the cross-section of the body through the stalk of the sucker. 



X 204 diam. To show the sticky glands O/LJ and their common efferent 



duct f'jl'.J. 



