170 DR. T. S. COBBOLD ON ENTOZOA. • 



Fig. 18. Lower part of one of the proboscides, showing the retractor muscle within the sheath. Magnified 



60 diameters. 

 Fig. 19. Anastomosing tubes seen beneath the skin, at the lower part of the body, in front of the pro- 



boscideal sheaths. Magnified 260 diameters. 

 Fig. 20. Two specimens of Dachnitis globosa ; male and female. Natural size. 



Fig. 21. Anterior extremity of the same (male), showing the position of the mouth and muscular oeso- 

 phagus. Magnified 260 diameters. 

 Fig. 22. Tail of the same, showing the sabre-shaped spicules and a depression immediately in front. 



Magnified 260 diameters. 

 Fig. 23. Section from near the centre of the female, showing more particularly the vaginal sheath and 



prominent folds of the vulva. Magnified 200 diameters. 

 Fig. 24. Ascaris acanthocaudata (mihi). Natural size. 

 Fig. 25. Section of the same, magnified 260 diameters. It exhibits the longitudinal muscular fibres with 



their nuclei, and a broad band of partially disintegrated cells, in the centre of which is a canal 



occupied by an apparently nervous thread. 

 Fig. 26. Tail of the same, with numerous minute spines at the tip. Magnified 260 diameters. 



Tab. XXXII. 



Fig. 27. Anterior part of Ascaris coUaris, exhibiting the small trilobular mouth, muscular oesophagus 

 and broad intestine ; also four caecal appendages, two on either side of the digestive tube. 

 Magnified 200 diameters. 



Fig. 28. Several examples of Scolex polymorphus. Natural size. 



Fig. 29. Head of Scolex polymorphus, showing the four suckers, the retracted proboscis, the so-called 

 water-vascular canals, the sclerous particles, carmine pigment-cells, and columnar epithelium. 

 Magnified 400 diameters. 



Fig. 30. Cyst from the peritoneal cavity of a Halibut. Natural size. 



Fig. 31. Distoma atomon removed from the cyst. Natural size. 



Fig. 32. The same, showing the suckers, the simple gastric CEeca, uterine tube, and contractile vesicle at 

 the inferior extremity. Magnified 20 diameters. 



Fig. 33. Four examples of Distoma gracilescens. Natural size. 



Fig. 34. One of the same, magnified 60 diameters. It displays the spinose tubercles of the skin, the 

 position of the suckers, the central penis-sheath, the botryoidal vitelline organs on each side of 

 the neck, the two (or four ?) testes, the uterine tube, the ovary and seminal reservoir, and the 

 large muscular contractile vesicle*. 



Fig. 35. Bunch of vitelline organs. Magnified 100 diameters. 



Fig. 36. Section of the uterine tube, with its double row of contained ova. Magnified 100 diameters. 



Fig. 37. Ovum. Magnified 260 diameters. 



Fig. 38. Outline of a dissection of the Short Sun-fish, showing in particular several Gymnorhynchi 

 enclosed in cysts within the retractor muscles of the anal fin. Reduced to ^th of the natural size. 



Fig. 39. Head, neck, and subcervical enlargement of Gymnorhynchus reptans enclosed within a transpa- 

 rent sheath. Enlarged ^rd of the natural size. 



Fig. 40. Anterior fourth of the body of Gymnorhynchus reptans removed from its investing capsule. 

 Natural size. 



Fig. 41. A few articulations from the posterior part of the body. Natural size. 



Fig. 42. Club-shaped proboscis exhibiting a multitude of small booklets serially disposed in rows of six- 



* Von Siebold, in his 'Lehrbuch der vergleich. Anat.,' speaks of three or four testes in D. appendiculatum and 

 D. cygnoides. 





