144 NEW YORK ZOOLOGICAL SOCIETY. 



The abdominal cavity contained a considerable quantity of 

 thin, yellowish fluid, in which were found several detached cys- 

 ticerci without caudal vesicle. 



The examinations were made by putting the cyst upon a slide 

 and puncturing it. The hydatid is usually invaginated, but by 

 putting it between two slides and exerting slight pressure, the 

 head will be protruded, the suckers and booklets plainly seen, and 

 can be counted without staining the specimen. By the addition 

 of a little balsam you have a permanent mount. By immersing 

 a specimen in 8 per cent, solution of caustic potash, and then 

 through a clearing fluid, as oil bergamot, the booklets are better 

 shown. 



