136 MESOZOA. 



3. Professor F. E. Schulze discovered a small marine organism 

 Trichoplax adh&rens in the form of a thin, //zr^-layered, externally 

 ciliated plate ; and Monticelli records a similar form under the title 

 Treptoplax adh&rens. But Trichoplax is now said to be the planula 

 of the Hydromedusan Eleutheria. 



4. Professor J. Frenzel discovered in brine solutions a minute 

 Turbellarian-like organism Salinella salve whose body consists ot 

 one layer of cells (Fig. 64). There is an anterior mouth, a ciliated 

 food canal, and a posterior anus. The ventral surface is finely ciliated, 

 the other cells bear short bristles. The animal reproduces by trans- 

 verse fission, but conjugation and encystation also occur. 



It must be confessed that some corroborative evidence in regard to 

 this peculiarly simple animal is much to be desired. 



