33 



nected with those of the Echinococcus vesicle, and sub- 

 sequently, when these small vesicles have attained a 

 certain size, again lead to the formation of processes 

 in themselves. Thus, from these new (4 to 10) pro- 

 cesses, the scolices of the Tsenise are produced, with 

 a general increase in the size of the capsule. The 

 wall of the vesicle, in which the head is inverted, 

 afterwards forms the hinder part of the young Tsenise. 

 When the Echinococcus heads are developed in the 

 interior of the process which has become converted 

 into a vesicle, which always takes place uniformly, 

 the brood capsule bursts, and its walls, and with them 

 the inner layer, with the individual heads, turn inside 

 out (Kiichenmeister). 



The anterior portion or head (PI. III. fig. 1, A, a) 

 of these embryo parasites ^are formed as are those of 

 the Taenia or Cysticercus. They possess the sucking 

 discs (PI. III. fig. 1, B, a) and a double circlet of 

 hooks, varying from 46 to 54 in number (PI. III. 

 fig. 1, B, b; and fig. 3). 



This is followed by the neck, which is short, and 

 contains calcareous corpuscles (PL III. fig. 1, B, c). 



The body is discoid rather than globular, also filled 

 with granular corpuscles, sometimes attached to the 

 membrane by a pedicle (PI. III. fig. 1, A, b), and 

 sometimes not, and is 2 1 o to A of a line in length. 



The hooks (PL III. fig. 1, C) of this parasite are, 

 according to Eschricht, 0'02 to 0*022 mil. in length. 



In neither the Echinococcus nor the Cysticercus 

 have any sexual organs been found. 



Habitat. These parasites are found pretty gener- 



