Plaie XV. 



On'CHOCOTYLE spinacis. 



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

 with hot sublimate. With the main excretory vessels. 

 ,, 2. The same in outline, with the nervous system. 



3. Median sagittal section through the anterior end of the body. x 204 

 diam. 

 „ 4. Cross-section of the anterior sucker through the beginning of the pos- 

 terior one-third of its length, x 204 diam. 

 5. One of the hooks at the extremity of the caudal appendage, x 305 diam. 

 ,, G. Ovarian ova near the oviduct end. x 204 diam. 

 „ 7. Cross-section of the intestine, x 204 diam. 



„ 8. Cross-section of one of the posterior suckers. x 73 diam. chit', space 

 left by the breaking away of the chitinous supporting rod. 

 9. Chitinous supporting rod of the posterior sucker, x 204 diam. 

 „ 10. Median portion of a cross-section of the body (22nd section behind the 

 genital opening), x 204 diam. 



