PEROPHORA ANNECTENS. 69 



brane tres-delicate qui les fixe assez lAchement a Tintes- 

 tine," And he further states that in some cases the am- 

 pullce sometimes project into the blood space surround- 

 ing the intestine without being at all in contact with the 

 latter. I believe the structure is considerably more in- 

 timately related to the intestine than the description of 

 this author would lead us to understand. In sections 

 through this region (which he seems not to have made), 

 one sees that in general the exceedingly thin walled am- 

 pullae are so closely applied to the intestinal wall that it is 

 often impossible to distinguish more than one layer sep- 

 arating the lumen of the ampulla from that of the in- 

 testine. 



This fact may be important, it seems to me, as bearing 

 on the question of the function of the organ. I have 

 likewise failed to find the sudden and marked transition 

 from the flat cells of the ampullcC to the much higher 

 cylindrical cells of the ducts, as described and figured 

 by Chandelon; and I can find nothing in the structure of 

 the organ to warrant the assumption that its function is 

 secretory in the strict sense of the word. 



I have never found an individual in which the oro;an 

 was wanting, as Girard ('72) states to be the case occa- 

 sionally in some Tuni^ates, according to his observations. 



PARASITES IN THE DIGESTIVE TRACT. 



In fig. 22, pi. iii, .r, .v' and vv", I have represented some 

 bodies concerning the nature of which I am in much 

 doubt. That they are a stage in the life of some gre- 

 garine, seems to be the most reasonable suggestion that 

 I can make, and this seems the more reasonable since an 

 undoubted representative of this group of protozoa is 

 found in the stomach, not only of this same individual, 

 but also of several others. As to what stage it represents, 



