Description op Plate XXXIX. 

 The development of Filaria Sanguinolenta in the walls of the Aorta of Dogs. 

 Fig. 9. Longitudinal section of the aorta of a dog. Three, more or less distinctly marked, 

 patches are seen on its inner surface ; the lowest, having been dissected under 

 a low power, displays a hair-like parasite ... ... ... ... Natural size 



„ 10. A portion of the aorta of a dog with parasite-tumours firmly adherent to it. Towards 

 the middle one of the tumours is seen to have been cut into, and a minute worm 

 is distinguishable... ... ... ... ... ... ... Natural size 



„ 11. One of the parasites removed from a tumour. The pharynx and oesophagus occupy 

 more than two-thirds of the entire length of the alimentary canal. Reproductive 

 organs not distinguishable ... ... ... ... .. ... X 12 



„ 12. Ditto, ditto, undergoing the process of casting its skin ; the old cuticle is seen to have 



become torn across ... ... ... ... ... ... X 12 



„ 13. As Fig. 11. Shortly previous to the period of moulting. The continuity of the, shortly 

 to be discarded, cuticle, with the termination of the alimentary canal is very 

 evident ... ... ... ... ... ... ... ... X 100 



„ 14. Ditto in a more advanced stage of development, the sex having become distinguishable. 

 A young female worm. The vagina is seen to terminate a short distance above the 

 junction of the oesophagus with the intestine, then to divide into two uterine tubes 

 which are seen, in the lower portion of the figure, to be continuous with the 

 ovarian tubules ... ... ... ... ... ... ... X 10 



„ 15. A young male worm, nearly mature. The spermatic tube is seen to commence csecally 

 towards the anterior portion of the parasite and to wind along the intestinal canal 

 until the caudal extremity is reached. The two spicules have also become 

 developed ... ... ... ... ... ... ... X 10 



