T. B. KOSSETEl? ON CYSTICERCUS QUADKTCURVATUS. 343 



analogous to those of the organism I have described above, 

 and, therefore, I have come to the conclusion that this 

 Cysticercus is that of a hitherto undiscovered tape- worm. 



In order that the tape-worm from this Cysticercus may 

 be recognized I propose to give it the name of Cydicercus 

 quadricurvatus, Rosseter. 



Explanation op Plate. 



Fig. 1. Cysticercus quaclricurvatus taken from body cavity of 



Cyclops agilis, x 400. 

 „ 2. Bundle of hooks to show the position on rostrum, x 



1,500. 

 ,, 3. Single hook, detached to show formation, x 1,600. 

 ,, 4. Contents of cyst emitted by action of nitric-acid 



with muscular tract, x 300 

 ,, 5. Muscular tract of same, x 600. 

 ,, 6. Ruptured cyst with subcuticular membrane intact, x 



180. 



