DESCRIPTION OP PLATES. XXlll 



FIG. 



4. A few articulations or sexually immature proglottides from the lower part of 



the body. Natural size. 



5. One of the club-shaped proboscides isolated (x 20 diam.). 



6. Diagram of one of the smaller hook-circles (x 60 diam.). 



7. One of the large hooks (^ 260 diam.). 



8. One of the small hooks (x 260 diam.). 



9. Head of Tetrarhynchus reptans viewed from above (x 8 diam.). 



These figures are original. — T. S. C. 



PLATE XI. 



1. A mature specimen of Fasciola hepatica seen from the ventral aspect (x G 



diam.). After Blanchard. 



2. Diagram representing the digestive system (x 2 diam.). Original. 



3. Diagram of the water- vasciilar system (x 2 diam.). Original. 



4. Outline of the so-called cerebral ganglia, commissural band, lateral ganglia, 



and branching filaments. Altered from Blanchard . 



5. Diagramatic representation of a few of the cutaneous spines (highly magnified). 



Original. 



6. Upper part of the male reproductive apparatus. Altered from Kiichenmeister. 



7. Egg of Fasciola hepatica, showing the so-called mulberry stage of yelk- 



segmentation. Original. 



PLATE XII. 



1. Head, neck, and upper joints of Tcenia solium. Reduced from Blanchard. 



2. One of the lower or sexually-mature joints of the same, showing the water- 



vascular canals and the branched uterine organ distended with ova. After 

 Blanchard. 



3. Two eggs ; one of them containing a six-hooked embryo. Original. 



4. An egg invested by its primitive yelk-sac, the superfluous granular yelk-mass 



is also shown. Original. 

 5 — 10. Six dissections, showing the so-called Cysticercus cellulosce in various stages 

 of development. Reduced from Leuckart. 



11. A fully-developed Cysticercus cellulosce, taken from fresh pork. (Natural size.) 



From a figure by the late Professor Smith, of Cork. 



12. Cysticercus from salted pork. After Smith. 



13. The same (as Fig. 11), x 6 diam. Smith. 



14. Head and body withdrawn from the caudal vesicle. Smith. 



15. One of the cephalic hooks (x 400 diam.). Smith. 



16. A group of the so-called calcareous particles (= " assimilating cellules," Smith) 



from a Cysticercus taken from salted pork (x 620 diam.). Smith. 



PLATE XIII. 



1. Juvenile hydatid, about six weeks old (x 50 diam.). From a specimen reared 

 by Leuckart, and now in the Author's collection. Original. 



