Description of Pl4.te XL. 

 Fig. 16. Anterior extremity of a mature Filaria sanguinolenta, showing the lateral aspect of the 



mouth, the pharynx and upper portion of the oesophagus X 60 



„ 17. The mouth as seen from the front, with its six minute " lips " and chitinous pharynx ... X 80 



„ 18. Caudal extremity of the male. Ventral aspect. Two spicules are seen of unequal length, 



with eight pre-anal and four post-anal papillae... X 25 



„ 19. A dissection of the posterior extremity of the male. The cuticular and muscular coverings 

 have been divided and the various organs exposed : — a Intestinal tube :— & Vas deferens 

 separated by a sphincterlike constriction from the testis (c) ; the caecal extremity of this 

 tubule is represented separately at d : e e Retractor muscles of the longer spicule (/)... X 30 



„ 20. Cellular bodies pressed out of the spermatic tube ... ... X 500 



„ 21. Thiee. 'portiouB of & vaaXxxxQ iera.&\e Filaria saiiguinolenta : — 



a. Anterior portion, the outline of the mouth altered through separation of the cuticle by 



the action of spirit. 

 &. Termination of genital tube ; the vagina, twisted on itself, is seen lying alongside the 

 intestinal canal immediately below the junction of the latter with the oesophagus. 

 It is distended with ova and divides into the two uterine tubes. 

 c. Caudal extremity : The two uterine tubes with cellular contents, are observed to 

 terminate abruptly in minute tubules (the ovarian) which form coils around the 

 lower portion of the alimentary canal ... ... y 20 



