656 



Fig. 248. Head with extended rustelluni. x50C. AftcM- R. Hlaii- 



chard, 1891B, fig. 2. 

 Fig. 249a-b. Hooks: a, from rostellum, x400; b, from sucker, 



x2,500. After R. Blanchard, 1819B, fig. 3. 

 Fig. 260. Isolated segment: 1, evaginated cirrus with spines; 2, 



genital tubercle; 3, orifice of game with sphincter; 



4, cirrus pouch, with ring of minute sharp spines; 



5, seminal canal; 6, mass of spermatozoa. x600. 

 After Rosseter, 1892, PI. XXIII, fig. 8. 



Fig. 251. Cysticercoid taken from the body cavity of Cypris 

 cinerea; a hooks on rostellum; b, hooks on suckers. 

 x360. After Rosseter, 1892, PI. XXII, fig. 1. 



Figs. 252-255. Ophryocotyle proteus. After Friis, 1869, taken 

 from R. Blanchard. 1891B, fig. 20. 



Fig. 252. Strobila. 



Fig. 253. Head and neck with retracted infundibulum. 



Fig. 254. Head and neck with extended infundibulum. 



Fig. 255. Sucker with armature. 



Plate XX, Figs. 256-269. — Taenia cantanian. Taenia Delafondi, 

 Taenia imbutiformis. Taenia megalops, and Taenia nigrop- 

 unctata. 



Fig. 256. Taenia cantania: a, head; b, suckers; c. organ taken 

 by Polonio for the "genital pore?"; d, well-developed 

 eggs. After Polonio, 1860, Tav. VII fig. 2. 



[Figs. 257-262.— Megnin's (1891, Figs. A-F.) figures of "Taenia 

 sphenocephala"=Railliet's Taenia Delafondi.] 



Fig. 257. Strobila natural size. 



Fig. 258. Head and neck. x60. 



Fig. 259. Three sexually segments. xl4. 



Fig. 260. Eggs. x375. 



Fig. 261. Isolated oncosphere. 



Fig. 262. Segmenting egg. 



Fig. 263. Taenia imbutiformis: a, suckers; b., middle portion; 



c, caudal portion; d. "genital pores" (?). After 



Polonio, 1860. Tav. VII, fig. 3. 



[Fig. 264-267. — Taenia megalops from Brazilian teal (.-\nas 

 braziliensis). Coll. Vienna Museum.] 



Fig. 264. Strobila natural size. Original. 



Figs. 26"-267. Three views of head, enlar.ged. Origiml. 



