FISHERIES, GAME AND FORESTS. 



183 





the sporozoites escaping by rupture of the cyst. In no case were there thread-bearing 

 capsules as in the spores of the Myxosporidia. 



A nucleus could not be made out either in the spore or the sporozoite. The 

 entire cell, however, acts like a nucleus in its 

 staining reactions and I believe that neither the 

 spore, the sporozoite, nor the adult organism has 

 a morphological nucleus, but all possess chromatin 

 distributed throughout the cell. 



No trace of a motile organ could be found 

 on the sporozoites, which, in the intestine, were 

 lost in the hordes of bacteria, so that they could 

 not be followed. In the testis, however, they 

 were found in groups against the epithelial tissues 

 and were often seen in the epithelial cells. In •> 

 the digestive tract they also reach the epithelial 



Figure 3. — Two epithelial cells from the pyloric 



cells and as intra -cellular parasites grow to coeca showing the sporozoites (St in the cyto- 



, r 1 . 1 • plasm. Camera drawing, x 2000 diameters. 



homogeneous masses of about the same size as 



the spores (Figure 3). In this stage of growth it is impossible to tell, except 



by their further history, the sporozoite from the spore (Figure 4, A). As a rule, 



FIGURE 4.— Transformation of the sporozoite and growth into the adult form. A, a group of four sporozoites as they 

 appear in the lymph. B, the beginnings of pseudopodia — formation and appearance of the vacuole. C, loss 

 of the homogeneous appearance and beginning of the reticular condition. Z>, later stages showing disappearance 

 of the reticulate structure and the increase of the densely staining cytoplasmic granules. The last two forms 

 are twenty-two and twenty-five microns in length. Camera drawings, x 2000 diameters. 



however, the sporozoites are common in the lymph around the intestine, pyloric 

 cceca, etc., and they usually show some indication of amoeboid motion which is never 



