TAPE-WOIiilS OF THE SUB-FA.MILV AVIT1;LLIX1X:E. o83 



PLATE 13. 



A vi tell ilia cent ripuiic tatu (Rivolta). 

 Fig. 17. — Cuticula of the sucker.s. x 78-t. 



Fig. 18. — Cuticula of the proglottids, silver nitrate fixation. X 7Si. 

 Fig. 19. — Subcuticula and cuticula. X 78 i. 

 Fig. 2). — Suljcuticula near tlie lateral margin, x 784. 

 Fig. 21. — Cuticula and subcuticula in an old segment. X 392. 

 Figs. 22, 23. — Dorso-ventral muscles, x 781;. 

 Figs. 24 2.5. — Transverse muscles, x 781. 

 Figs. 26, 27. — Longitudinal muscles, x 784. 

 Fig. 28. — '• Sommer-Landois *' cell, from the scolex. x 781. 

 Fig. 29. — ''Sommer-Landois" cells of the " subcuticular "' muscles of 

 the suckers, x 781. 



Fig. 30. — Ventral canal. 25 cm. from the scolex. showing epithelial 

 cells sinking into the parenchyma. X 781. 



Fig. 31. — Dorsal canal, 50 cm. from the scolex, showing nephrocytes. 

 X 781. 



Fig. 32. — Epithelial cell of the ventral canal sinking into the paren- 

 chyma to become a parent of flame-cells, x 781. 



Fig. 33.— Ventral canal. 1 cm. from the scolex, Avith developing flame- 

 cells and a group of young flame-cells, x 784. 



Fig. 31.— Flame-cell, x 781. 



Fig. 35. — Group of flame-cells, reconstructed from three consecutive 

 sections, x 392. 



Taenia serrata, Rud. 

 Fig. 36. — Developing flame-cells, x 781. 



Avitellina ceiitripunctata (Rivolta). 



Fig. 37.— Flame-cell. X 2352. 



Fig. 38. — Multipolar ganglion-cells from the central ganglion of the 

 scolex. X 784. 



Fig. 39. — Bipolar gauglion-cell from one of the nerves in the scolex , 

 showing tigroid bodies, x 781. 



Fig. 40. — Multipolar gangiiou-cell from the suckers. X 784. 



Fig. 41. — Young ovarium. X 588. 



Fig. 42. — Nutritive cell lying between three oocytes in a yoimg 

 ovarium, x 1116. 



