FLAT WORMS 



43 



Kofoid and Watson. 1910, call attention to the similarity of the 

 nervous structures in the scolex of cestodes with that of the pos- 

 terior region of some trematodes, and they suggest that with Gyro- 

 cotijle as an intermediate type the scolex part of the nervous system 

 of tape worms represents the caudal end of the worm. 



The only sense oi'gans of tape worms are represented by very 

 simple end knobs of sense cells in the cuticle. Fig. 11, B. 



Fig:. 11. Nervous system cestoda. A. Moniezia, Tower. B. Sensory cells 

 ending in hypodermis, Zernecke. C. Nervous system Gyrocotyle, 

 Kofoid and Watson. D, E, F, G, H, I, J, K. Central nervous systems 

 scolex end several species of Cestodes. L. Rhynchobothrium, Lang. 



BIBLIOGRAPHY 

 Andre, J. 



1910. Die Augen von Polystomum integerrimum Foel. 

 Zool. Bd. 15, pp. 202-220, 15 figs in text. 



Zeit. f. wiss. 



1910. 



Bartels, E. 

 1902 



Ueber den Augenfleck des Macracidium von Fasciola hepatica. 

 ZooL Anz. Bd. 36, pp. 400-405, 7 figs. 



Cystocercus fasciolaris. Anat. Beitrage zur entwicklung und 

 umwandung in Taenia crassicollis. Zool. Jahrb. Anat. Bd. 16, Taf. 

 37-39. 2 text figs. Nervous system, pp. 533-542. 

 Bayer, E. 



1898. Hypodermis und neue Hautsinnesorgane der Rhynchobdelliden. 

 Zeit. f. wiss. Zool. Bd. 64, pp. 647-696, Taf. 23-24, 10 text figs. 



