182 NEEH. 



three-fourths of the contour of the parasite. In the right, lower quarter 

 there is an isolated islet of the same substance in which are imbedded two 

 large, detached chromosomes. 



Whereas we detect about 15 chromatic nuclear dots in fig. 1, in fig. 2 

 we find only about 12 of them. In fig. 3, where both poles and the 

 remainder of tbe parasite show very distinctly that it is derived from a 

 crescent body, the chromatic band may easily be distinguished as a 

 crescent which runs from the upper left- to the lower right-hand corner 

 of the parasitic body in such a manner that the greater part of the 

 convex margin of this band does not touch its concave inner side. A 

 protoplasmic zone, which in some places is very narrow, may be seen 

 intact between the two margins. In the basic mass of this band we 

 find imbedded darker chromatic dots. In the upper half these are very 

 rare, are small and not very distinctly differentiated; in the lower half 

 they are much more distinct and are more or less detached, resembling 

 particles of the basic material. Indeed, two of these spots lie in the 

 contiguous protoplasmic substance of the parasite. Furthermore, we 

 find in fig. 1 an indefinite mass in the lower left-hand segment, con- 

 sisting of irregularly scattered, varicolored, small chromatic dots, with 

 transparent spots situated between them, making it appear as though 

 the parasite were perforated by pinpricks. Between these, and also in 

 the upper right-hand portion, a very typical, yellow-brown, coarse pig- 

 ment occurs which bears all the peculiarities of the pigment of the 

 crescent bodies. This spot, which is not easily defined, may, after the 

 analogy of the tertian macrogamete, be considered as an unfertilized body 

 (Restkorper) , in course of decomposition. Two large perforations may 

 clearly be seen in fig. 2, and one smaller one, somewhat beyond the 

 actual center of the parasite. Around these perforations the beautiful, 

 yellow-brown pigment of the crescent body is visible. ITowever, a 

 distinct unfertilized body (Restkorper) can not be discovered. 



In fig. 3 the corresponding pigment lies in the center of the proto- 

 plasm. Here it is very beautifully imbedded and arranged like the 

 stamens of the calix of a flower. 



We may affirm, without fear of contradiction, from the morphological 

 characteristics already described, that in figs. 1 and 2 we are dealing 

 with segmenting forms. I wish by the following argument to meet the 

 objection raised by Doctor Eodenwaldt that, after all, these might be 

 microgametocytes, the chromatic substance of which is in the act of 

 disintegration, the microgametes being about to be expelled. 



1. As far as I know, microgametocytes, of which the chromatic sub- 

 stance had already been segmented for the microgametes which are to 



