Explanation of Plates. 413 



Plate XXXVI. 



MewporodrU'Us asyinmetricus. 



Fig. 7. A. median longitudinal section reconstructed 

 from several sections. X 80. 



Fig. 8. Oviducal funnel and pore. X 210. 



Fig. 9. A seta. X 210. 



Fig. 10. Ventral portion of a transverse section 

 through IX, showing the position of the pore of one of 

 the spermathecae. X 190. 



Plate XXXVII. 



llesoporodrilus asymmetricus. 



Fig. 11. Median longitudinal section of anterior end, 

 from several sections. The proboscis of this specimen 

 had been lost, but its position, as shown by the injury to 

 the wall of the prostomium, is indicated by dotted 

 lines. X 80. 



Fig. 12. A cross section of the pharynx. X 120. 



Microscolex hempeli. 



Fig. 13. Diagram showing the arrangement of the 

 ventral setae in the anterior part. 



Plate XXXVIII. 



Microscolex hempeli. 



Fig. 14. Cross section from the region of the clitellum. 

 X 33. 



Fig. 15. From a superficial frontal section showing 

 the relations of the genital setae and pores of one side. 

 X 350. 



Fig. 16. Portion of a transverse section through the 

 male pore of one side. X 200. 



Fig. 17. Median longitudinal section of a specimen 

 with lips everted. X 30. 



