276 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. I. 



Fig. 9. Represents illustrations of comma forms met with in the epi- 

 thelial cells. In a coiled form is shown. Xiooo. 



Fig. 10 a-d. are illustrations showing the way in which the comma is 

 transformed into the adult parasite ; e-l represent forms which show the 

 various ways in which the nucleus, cavity and tail are disposed in the 

 adult or developing form. Xiooo. 



Fig. I \a. Represents a section of an epithelial cell in a cavity of which 

 are enigmatical structures, the larger one probably being parasitic, the 

 others may be either parasitic or protoplasmic masses with chromatin 

 spherules. Xiooo. 



Fig. \\b. In this cell are a number of structures all of which are evi- 

 dently parasites. Xiooo. 



Fig. 12. A cell found in the epithelial layer of the intestine of Nectu- 

 riis, n, the nucleus, /, plasmosomata-like masses which may be parasitic, 

 n^, a nucleus in which the chromatin is principally massed at one side and 

 continued into the cavity in the form of doubly beaded rodlets ; a dumb- 

 bell shaped body, deeply eosinophilous, is shown in the act of migration 

 from the cavity. X660. 



Fig. 13. Epithelial cells of the intestine of iV^^r/z^r/zj-/ «, the epithelial 

 nuclei ; /, the nuclei of leucocytes ; /, two intracellular parasites lying in 

 cavities of the cell. X660. 



Fig. 14. Intestinal epithelial cells oi Necturiis ; p, parasitic elements ; 

 /, the nucleus of a leucocyte, x 660. 



Fig. 15. Intestinal cells of Necturus ; p, parasites migrating from 

 from nucleus ; p^, either invaginated, cytolysed material or stages in the 

 development of the parasite. X600. 



Fig. 16. A single epithelial cell of the intestine of iW^/wrz/j, showing 

 a large cavity in its proximal part occupied by a parasite /, and proto- 

 plasmic remains,//'. X600. 



Explanation of Plate II. 



The outlines of all the figures were made with Abbe's camera lucida in 

 combination with 2mm. apochromatic objective and compensation ocular, 

 4 or 8. In the case of Fig. 8 the drawing was made at the foot instead of 

 at the level of the stage of the microscope, hence the difference in the 

 magnification. 



be, blood corpuscle. 



cm, cytolysed masses. 



