Plate IX. Figs. 100-111.— Drepanidolaenia anatinrt. 



Fig. 100 Rostellum with 5 of the 10 hoolcs. x240. AfCer Krabbf. 



1S69, Tab. VI, fig. 114. 

 Fig. 101. Isolated hook. x920. After Krabbe. 1S69, Tab. VI, fig. 



Fig. 102. Ovum. x240. After Krabbe, 1869, Tab. VI, fig- 116- 



Fig. 103. Transverse section of a portion of one segment, to 

 show the anatomy: h., testicles; vd., vas deferens; 

 bk.. fertilization canal; ut., utenjs; Im., longitudinal 

 muscles; s. bl., vesicula seminalis; gz., ganglion cells; 

 p. s., praeputial sac; c, cirrus; cb., cirrus pouch; 1. 

 k., longitudinal canals; (small dorsal canal; large 

 ventral canal); r. s^m., receptaculum seminis; ov., 

 ovary; eig., oviduct; d. St., vitellogene gland; d. g., 

 vitello-duct; sell, dr., shell gland; af., canal of same. 

 After Schmidt, 1S94, Taf. VI, Fig. C. 



Fig. 104. Ovum with oncosphere. After Schmidt, 1894, Taf. VI, 

 fig. 1. 



Fig. 105. The oncosphere has developed into a round mass in 

 which a cavity appears. After Schmidt, 1894, Taf. 

 VI, fig. 2. 



Fig. 106. Stage in which the round mass has become elongate; 

 ebl., terminal vesicle. After Schmidt. 1894, Taf. VI, 

 fig. 3. 



Fig. 107. Stage with anlage of the rostellum and suckers; the 

 body has become constricted into the scolex. cyst, 

 and tail; the excretory system is partly developed. 

 After Schmidt. 1S94, Taf. VI, fig. 4. 



Fig. 108. Transverse section in the second period of develop- 

 ment. After Schmidt, 1894, Taf. VI, Fig. a. 



Fig. 109. Longitudinal section of a later stage of the second 

 period of development. After Schmidt, 1894, Taf. VI, 

 Fig. b. 



Fig. 110. Extended cysticercoid; s., anterior point of rostellum; 

 r., rostellum; ex., excretory organ; h. r., posterior 

 rostellum sac. ebl., terminal vesicle. After Schmidt, 

 1894, Taf. VI, Fig. B. 



Fig. in Two isolated hooks from the rn.-^tellum. After Mrazek. 

 1891, Tab. VI, fig. 20. 



