382 LEWIS HENRY C40TJGH. 



Zeruecke. — '• Uiitersnclnmg-en iil>er den feineren Ban der Cestoden," 



' Zool. Jaln-b. Auat./ vol. xxvi. 1908. 

 Zsehokke. — ' Reclierclies snv la structure anatomique et histologique 



des Cestodes," Geneve, 1890. 



EXPLANATION OF PLATES 12-14, 



Illustrating Mr. Lewis Henry Gongli's " Monograph of the 

 Tape-worms of the Sub-famil}- Avitellininse, being a 

 Revision of the Genus Stile si a, and an Account of the 

 Histology of Avitellina centripunctata (Riv.)." 



PLATE 12. 



Avitellina centripunctata (Rivolta). 

 Fig. 1. — Portion of three segments at male sexual ripeness, x 99. 

 Fig. 2.— Oncosphfere. X 588. 



Fig. 3. — Pom- segments witli fully developed paruterine organs, x 99. 

 Fig. 4. — Cirrus-poucli and vagina, x 380. 



Fig. 5. — Left half of the excretoi-y canals of scolex, lateral view. 

 Fig. f). — Right half of the excretory canals, lateral view. 

 Fig. 7. — Scolex. 



Stilesia vittata, Railliet. 

 Fig. 8. — Pore-side of a segment at male sexiial ripeness. X 99. 

 Fig. 9. — Oncosphajre. X 588. 



Stilesia glohipimetata (Rivolta). 

 Fig. 10. — Pore-side of a segment at male sexual ripeness, x 99. 

 Fig. 11. — Oncosphsere. x 588. 

 Fig. 12.— Scolex. 



Stilesia hepatica, Wolffhi'igel. 

 Fig. 13. — Pore-side of a segment at male sexual ripeness, x ^9. 

 Fig. 14. — Segment witli develoiDing paruterine organs, x 99. 

 Fig. 15. — OncospluTre. x 588. 

 Fig. 16. — Cirrus pouch and vagina, x 380. 



