738 II. I\l. WOODCOCK. 



74 iind 10!». wliich are from a second sub-culture of 26 days, specially 

 for comparison.] 



[(c) indicates cliaffincli culture ; (k) redpoll-culture.] 



Figs. 71-86. — The ordinary trypanomonad type, showing variations 

 in size and in degree of development of the membi'ane. 



Figs. 71-76, 83-86 (c) ; figs. 77-82 (r). 



Figs. 87 and 88. — Individuals in which the kinetonucleus is a trifle on 

 the aflagellar side of the trophonucleus ; in fig. 88 division is just being 

 inaugurated. Both (c). 



Figs. 89-95. — Stages in equal binary fission. All (c) except fig. 83, 

 which is (r). 



Fig. 96. — Division-form of sul>-erpial character, giving rise to indivi- 

 duals of the accentuated trypanomonad kind. 



Fig. 97. — Accentuated trypanomonad individual (c). 



Figs. 98-104. — Various stages in the unequal division of the accen- 

 tuated trypanomonad individuals. Figs. 100 and 103 are (r), the rest 

 are (c). 



Figs. 10.5-111. — Illustrative of the two kinds of indiWdual which 

 result from unequal fission. Figs. 105, 107 (upper half), 108-110, 

 accentuated trypanomonad forms, often more or less clulj-shaped. with 

 niiclei far back and well-developed membrane; Figs. 107 (lower 

 half), 106 and 111 A and B, fusiform individuals, with only slightly 

 developed membrane ; note the comparatively short flagellum. Figs. 

 106 and 108 (r), rest (c). 



PLATE 30. 



Figs. 112-131, 133-163. — Cultural forms of T. fringillinarum 



(contd.) 



Figs. 112-114. — Pear-shaped forms, probably derived from the 

 smaller halves of unequal divisions, which have not become fusiform. 

 Figs. 112 and 114 (c), 113 (r). 



Figs. 115 and 118. — Small and large individuals of the accentuated 

 trypanomonad kind, passing into the ovoid or rounded condition. 

 Both (c). 



Figs. 116, 117. and 119. — Medium-sized rounded forms. (All c). 



Figs. 120-125. — Individuals from the (c) cultm-e which showed a 

 pronounced tendency to develop large massive forms. Many of them 

 are undergoing division. 



Figs. 126 and 127. — Early trypauiform individuals. (c) forty hours. 



Fig. 128. — ? Transition form from trypanomonad to tryjjaniform type. 

 (c) 6 days. 



Fig. 129. — Small trypaniform individual, (c) 6 days. 



