Plate IX. 



OCTOCOTYLE MAJOR. 



Fig. 1. The whole worm viewed from tlie ventral sitle. From a specimen killed 



under tlie pressure of a cover-sHp, and therefore much broader than it 



really is. 

 „ 2. Hooks at the posterior end of the body, with muscular fibres attached. 



X 204 diam. 

 „ 3. Chitiuous framework of the posterior sucker viewed from one side, x 305 



diam. The piece b is paired. 

 „ 4. One of the posterior suckers viewed entire iu profile, x 305 diam. 

 „ 5. Penis viewed in its natural position from the ventral side. x 305 diam. 



For clearness' sake the spines are drawn fewer than they really are. 

 „ 6. Ovarian ova near the oviduct end. x 305 diam. 



OCTOCOIYLE MINOK. 



Fig. 7. The whole worm viewed from the ventral side. From a specimen killed 



free with hot sublimate. The nervous system is shaded witli parallel 



lines. 

 „ 8. Anterior end of the body. x305 diam. To show the attachment of 



muscular fibres to the anterior suckers. 

 „ 9. Hooks at the posterior end of the body, u, outer pair ; x 305 diam. b, 



inner pair ; x 427 diam. 

 „ 10. Chitinous framework of the posterior sucker viewed from one side, x 305 



diam. The piece b is paired. 

 „ 11. Female genital ducts viewed from the ventral side. Free-hand. 

 „ 12. Median sagittal section thi-ough the region of the genital atrium. x 305 



diam. 

 „ 13. Penis viewed in its natural position from the ventral side. x 305 diam. 



The spines are represented one less than they really are. 



