PORTER, — Trichonympha. 
PLATE 4. 
All figures are of Pyrsonympha vertens. 
Fig. 45. Parasites attached by peduncles to a bit of the intestine of the host. 
Drawn from living specimens. x 400. 
Fig. 46. Optical section of anterior portion of a Pyrsonympha, showing the rela- 
tion of the knob-like structure (tub.) to the flagellum on one side and 
the peduncle on the other. X 1100. 
Fig. 47. Anterior portion of an individual, showing the nucleus and the superficial 
muscular cords. X 1100. 
Figs. 48, 49. Nuclei in stages of division. 
Fig. 50, A very much attenuated nucleus. 
Fig. 51. Surface view of a Pyrsonympha. Between the spiral muscular cords are 
bands of granular protoplasm. The region at a is bare of all muscu- 
lar cords. At the extreme posterior portion are several ring-like 
markings (ann.). X 400. 
Fig. 52. Cross section through the animal in the region of the nucleus. X 1100. 
Fig. 53. Optical longitudinal section of a Pyrsonympha with its nucleus in the 
posterior half of the body. X 520. 
Fig. 54. Portion of the surface of a Pyrsonympha, greatly magnified, showing a 
finer and a coarser set of muscular cords. The cords of the finer set 
are surrounded by a clear homogeneous substance, while granular 
protoplasm surrounds those of the other set. 
Fig. 55. Optical section of the Pyrsonympha represented in Figure 51. There are 
two nuclei flattened against each other. X 400. 
R 
