LITERATURE OF THE TREMATODA 91 



gence along two lines, in one of which a complicated life-history 

 gradually took place ; from this line the Aspidocotylea branched off, 

 and possibly the apparently primitive characters of the alimentary 

 canal is one of atavism. 



The following " tree " represents the history of the group : 



Heterocotylea. 



Malacocotylea. 



spidocotylea. 



TREMATODA. 



Temnocephala. 



RHABDOCOELA. 



LITERATURE OF THE TREMATODA. 



1. Boer, v. Nova Acta, xiii. (pt. 2), 1827, 2, p. 527. 



2. Beneden, E. v. (Rech. s. 1. composition et la signification de 1'ceuf.) Mem. 



Cour. Acad. Roy. Brux. (4to), xxxiv. 1870. 



3. Bcneden, P. J. van. (Excretory System.) Bull. Acad. Roy. Belg. xix. (pt. 1), 



1852, p. 573. 



4. Ibid. Mem. sur les vers intestinaux, 1858. 



5. Beneden, P. J. v., and Hesse. (Recherches s. 1. Bdellodes et les Trematodes 



marines.) Mem. Acad. Roy. Belgique, xxxiv. 1864. 



6. Benham. Quart. Journ. Mic. Sci. xxvii. 1886, p. 561. 



7. Biehringer. (Cuticle : Germ-balls.) Arb. Zool. Inst. Wurzburg, vii. 1885, 



p. 1. 



8. Bloclimann. (Musculature, etc.). Biol. Centralbl. xv. 1895, p. 216. 



9. Ibid. (Die Epithelfrage bei Cestod. u. Treinatod.) Vortrag. gehalt auf. 



d. vi. Jahrs. d. Deutsch. Zool. Gesell. z. Bonn, 1896 ; also, Zool. Anz. xx. 

 1897, p. 460. 



10. Brandes. (Holostomidae.) Zool. Jahrbuch (System.), v. 1891, p. 549. 



11. Braun. Bronn's Thierreichs (Wiirmer), 1889, et seq. 



12. Ibid. (Holostomidae.) Zool. Anzeig. xvii. 1894, p. 165. 



13. Cerfontaine. (Striated Muscle.) Bull. Acad. Roy. Beige (ser. 3), xxvii. 1894, 



p. 949. 



14. Ibid. (Polystomidae). Arch. Biol. xiv. 1895, p. 497. 



15. Diesing. Systema Helmintlmm, 1850. 



16. Fraipont. (Excretory System.) Arch. Biol. i. 1880, p. 415 ; ii. 1881, p. 1. 



17. Gaffron. (Nervous System.) Zoolog. Beit. hrsg. v. Ant. Schneider, i. 1884 



p. 109. 



