176 COMPARATIVE ANATOMY CHAP, m 



apertures of the water -vascular system. Such a segmented body 

 represents a simple Platode individual, not a Platode stock; it does 

 not arise by budding. Strobilation and segmentation are therefore 

 to be clearly kept apart. 



Literature. 



L. v. Graff. Monographic der Turbellarien. I. Rliabdocoelidce. Leipzig, 1882. 

 Arnold Lang. Die Polycladen (Seeplanarien) des Golfes von Neapel. (Fauna und 



Flora des Golfes von Neapel XL) Leipzig, 1884. 

 Is. Ijima. Ueber Bau und Entwickelung der Susswasserplanarien (Tricladen}. 



Zeitschr. f. wissensch. Zoologie. 1885. 



R. Leuckart. Die Parasiten des Menschen. 2d edition not yet completed. 

 Numerous treatises and works by Sieboldt, Leuckart, Pagenstecher, Ercolani, Vogt, 



M. Schultze, 0. Schmidt, Quatrefages, Hallez, v. Graff, Selenka, Gbtte, Wagener, 



v. Beneden, Zeller, Braun, v. Kennel, Schauinsland, Thomas, Sommer, Landois 



Pintner, Kiichenmeister, Fraipont, Lang, etc. 



