148 



PRACTICAL PAEASITOLOGY 



for the purpose of obtaining the eggs. This manipulation serves also 

 to show the calcareous bodies, which are recognized by their high 



Exg. 



FIG. 69. Central portion of a mature segment of Dipylidium caninum. Magnified. 

 Cb., Cirrhus pouch. D. , Yolk-gland. Exg. , Excretory vessel . H., Testes. K., Ovary. 

 U., Uterus. V., Vagina. (After Neumann and Railliet.) 



refractivity and their concentric stratification. They are situated in 

 the parenchyma and, when present in large numbers, give to the 



worm its chalk -white 

 appearance. Cestodes 

 in which but few cal- 

 careous bodies are pre- 

 sent, are yellowish-white 

 in colour and are of 

 greater transparency. 



Whole preparations 

 should be made of the 

 head, of mature, and of 

 ripe proglottides, and 

 sections of these parts 

 should also be prepared. 

 The preparation of 

 ripe segments whole 

 offers no difficulty. The 

 fresh proglottide is 

 pressed between two 

 cover - glasses, fixed in 

 FIG. 70. -Mature proglottide of Dibothriocephalus alcohol, and treated with 



latus(L.}. The lateral fields contain the numerous yolk- alcohol and glycerine, in 

 gland follicles; the central field contains the cirrhus- i u *. n A 4 



pouch, uterus, vagina, ovary, and shell-gland. 15:1. whlch lfc 1S all OWed to 



