K. R. Lewin 
259 
more definite and finally resolve themselves into the highly refringent 
spores.” 
The remarkable nature of the above account has not escaped 
criticism. Chatton (1912) appends to a summary of Strickland’s paper 
the following note ;— 
“ Nous connaissons cette gregarine. Disons des maintenant qu’elle 
effectue sa sporogenese suivant le mode normal: conjoints non fusionnes, 
formant, par perlage, des gametes a peine inegaux, peu mobiles, qui 
copulent. Les sporocystes, d’abord peripheriques, finissent par etre 
enferm(is dans le reliquat, faiblement amiboide. La dehiscence est 
quelconque. La place de cette gregarine nous parait dans la famille des 
Actinocephalides.” 
How thoroughly Chatton’s note is justified will be seen in the 
following part of this paper. 
TJie Trophozoite. 
In Text-fig. 1 is shown a stage in the transition between the sporozoite 
and the trophozoite. The gregarine figured is not yet segmented into 
protomerite and deutomerite, but is already provided with a rudimentary 
epimerite. 
Fig. 1. Fig. 2. 
Fig. 1. Young trophozoite, showing rudimentary epimerite, but no differentiation into 
protomerite and deutomerite. Nucleus and faint striations visible. (From life.) 
Fig. 2. Trophozoites from life, (a) Single karyosome in nucleus. (6) Kefringent 
granules in karyosome. (c) Chromatin in band, (d) Irregular karyosome with 
refringent granules, a, b, c on same scale, d more highly magnified. 
Neither Strickland nor I have found an intracellular stage in 
Agrippina bona. 
A full account of the external morphology of the trophozoite is 
given by Strickland, and we shall here concern ourselves with the 
nuclear structure. 
