Roth to be a fpecies of Polypus, may frequently be feen adhering In an irregular 

 manner to its furface. The Conferva introduced by Dr. Roth in the fecond fafci- 

 cuius of his Catale&a under this name, is a very different plant, and appears to be 

 only a fmall variety of Ulva comprefia. 



A. C. flexuofa, of its natural fize. 



B. Ditto, magnified 3. 



