460 CYSTIC STAGE OF T^NIA SAGINATA. 



servant brought me word that it had died during the night. The 

 day before it had been ill and unable to stand, though it had taken 

 its milk as usual. 



An immediate post-mortem examination showed at once that the 

 feeding had been followed by a rich result. All the muscles, and 

 especially those of the breast and neck, and the psoas, were penetrated 

 by cysts, which had a breadth of 1-5-3 mm., and a length of about 

 2-4 mm. They were whitish, as if filled with chalky or tubercular 

 masses, such as had never been seen in the young cysts of Cysticercus 

 cellulosce. Inside the exudation layer, which was surrounded by a 

 firm connective-tissue envelope, they contained a clear vesicle of 

 about 0-4- 1-7 mm. in diameter. On cutting into the cyst this pro- 

 truded, and was recognisable as a young Cysticercus. 



These bladder-worms were round, sometimes pointed at one pole. 

 The internal cavity was small, and mostly confined by the conical 



vesicle to the distended end of the body. 

 Below the cuticle, which looked as if it 

 were continually shedding off scales, 

 could be distinguished first a thin layer 

 of delicate transverse and longitudinal 

 fibres (the first at intervals of 0'03, the 

 others of 0'05 mm.), whose muscular 

 nature was already evidenced by the 

 Via. 264. --Young bladder- worms powerful Contractions of the little worm. 



of Taenia sagtnata, with rudimentary i^ , . , i • i i e 



head, (x 30.) Below this there was a thick layer ot 



small cells difficult to isolate, and finally, 



clothing the internal cavity, large clear vesicles measuring 0-05-007 



mm. in diameter. Between these there lay yellow balls of irregular 



and partly ramified appearance. Vessels could not be detected even 



in the largest bladder-worms, but the latter exhibited already the 



rudiment of a head, which intruded for about 0'3 mm. into the 



interior of the very wide bladder cavity, and which seemed to be 



attached not to the equatorial zone, but to one end of the body. 



There was as yet no trace of suckers. The interior of the head 



showed hardly any terminal enlargement, but was in some of the 



smaller bladder-worms still of a simple conical form. 



Although these cysts were extremely numerous, and in many 



places lay so thickly together that their total number must have been 



many thousands, yet it seemed at first as if the death of the animal 



under' experiment could hardly have been caused by them. It was, 



however, indeed the Cysticerci which had killed the calf. Further 



examination showed that the distribution of the parasites was in no 



way confined to the peripheral muscles of the body. The internal 

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