170 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 26. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Fig. 30. 
Fig. 51. 
Fig. 32. 
Fig. 33. 
Fig. 34. 
Fig. 35. 
Fig. 36. 
Fig. 37. 
Fig. 38. 
| Fig. 39. 
Fig. 40. 
Fig. 41. 
Fig. 42. 
DR. T. S. COBBOLD ON ENTOZOA. 
Lower part of one of the proboscides, showing the retractor muscle within the sheath. Magnified 
60 diameters. 
Anastomosing tubes seen beneath the skin, at the lower part of the body, in front of the pro- 
boscideal sheaths. Magnified 260 diameters. 
Two specimens of Dachnitis globosa; male and female. Natural size. 
Anterior extremity of the same (male), showing the position of the mouth and muscular æso- 
phagus. Magnified 260 diameters. 
Tail of the same, showing the sabre-shaped spicules and a depression immediately in front. 
Magnified 260 diameters. 
Section from near the centre of the female, showing more particularly the vaginal sheath and 
prominent folds of the vulva. Magnified 200 diameters. 
Ascaris acanthocaudata (mihi). Natural size. : 
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. 
Tail of the same, with numerous minute spines at the tip. Magnified 260 diameters. 
Tas. XXXII. 
Anterior part of Ascaris collaris, exhibiting the small trilobular mouth, muscular cesophagus - 
and broad intestine; also four cæcal appendages, two on either side of the digestive tube. 
Magnified 200 diameters. 
Several examples of Scolez polymorphus. Natural size. 
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. 
Cyst from the peritoneal cavity of a Halibut. Natural size. 
Distoma atomon removed from the cyst. Natural size. 
The same, showing the suckers, the simple gastric ceca, uterine tube, and contractile vesicle at 
the inferior extremity. Magnified 20 diameters. __ 
Four examples of Distoma gracilescens. Natural size. 
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*. 
Bunch of vitelline organs. Magnified 100 diameters. 
Section of the uterine tube, with its double row of contained ova. Magnified 100 diameters. 
Ovum. Magnified 260 diameters. i 
Outline of a dissection of the Short Sun-fish, showing in particular several Gymnorhynehi 
enclosed in cysts within the retractor muscles of the anal fin. Reduced to 4th of the natural size. 
Head, neck, and subcervical enlargement of Gymnorhynchus reptans enclosed within a transpa- 
rent sheath. Enlarged ird of the natural size. 
Anterior fourth of the body of Gymnorhynchus reptans removed from its investing capsule. 
Natural size, 
A few articulations from the posterior part of the body. Natural size. Å 
Club-shaped proboscis exhibiting a multitude of small hooklets serially disposed in rows of ert 
* Von Siebold, in his ‘Lehrbuch der vergleich. Anat.,’ speaks of three or four testes in D. appendiculatum ad — 
D. cygnoides. ; : . : 
