STUDIES ON AVIAN HJIMOPROTOZOA. 739 



Figs. 130 and 131. — Greatly elongated trypaniform individuals, (c) H 

 days. 



Fig. 132. — Trypaniform phase of a trypanosome of Athene noctua 

 from the stomach of Culex pipiens. 



Figs. 133, 134, and 136. — Roimded forms still possessing a flagellum, 

 but lacking any signs of an undulating membrane. In the two first a 

 large vacuole is present. Fig. 133 (c), figs. 134 and 136 (r). 



Figs. 135 and 137.— Rounded forms without a flagellum (b). 



Figs. 138 and 139. — Small rounded forms in a dying condition ; tlie 

 two nuclei are gradually disappearing (b). 



. Figs. 140-146. — " Pseudo-herpetomonad " forms, illustrating various 

 degrees in the loss of the memljrane and attached part of the flagellum. 

 Figs. 140. 145, and 146 (c). 141-144 (b). 



Fig. 147. — Herpetomonad form (c). 



Figs. 148 and 149. — Pear-shaped forms, with little or no attached 

 part to the flagellum (r). 



Figs. 150-163. — All these forms are from a (b) culture of 19 days. 



Figs. 150-153. — Large, altered, unhealthy parasites, witli a develop- 

 ment of granular substance in the region of the base of the flagellum. 



Fig. 154. — Parasite showing two large vacuoles. 



Fig. 155. — Individual with a kinetonucleus, but no trophonucleus. 



Fig. 156. — Individual with one kinetonucleus and two trophonuclei. 



Fig. 157. — Dividing parasite, showing how the unequal distribution of 

 the nuclei, as found in the two last forms, is brought aljout. 



Fig. 158. — Parasite with three trophonuclei for one kinetonucleus. 



Fig. 159. — Showing the splitting off of an individual with a flagellum, 

 but with no nuclear substance at all. 



Fig. 160. — A free, active individual, with no definite nucleus of either 

 kind, but with scattered granules. 



Fig. 161. — Showing the splitting-off of a portion of the cytoplasm 

 •containing only a few granules. 



Figs. 162 and 163. — Forms showing irregular multiplication of the 

 different organellse. 



"n"- 



PLATE 31. 



[The micro-i^hotographs on this plate were all taken for me hj my 

 friend Dr. D. J. Reid, to whom I wish here to express my deep sense of 

 his kindness and to offer my sincere thanks. It is as well to point out, 

 perhaps, that the more deeply stained parts have come out, in most 

 ■cases, relatively far too dark. 



The magnifications are as follows (approximately) : Figs, a-d 1630, 

 fig. E 620, fig. F 500, fig. G 550, figs, h and j 1630, fig. k 1840, 

 fig. L. 1220.] 



VOL. 55, PART 4. — NEW SERIES. 49 



