Plate XV. 



Onchocotyle spinacis. 



Fig. 1. The wliole 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 805 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. chW, 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. 



