166 Meyen's Report for 1839 on Physiological Botany. 



on the coast near the Giant^s Causeway in July 18373 and 

 not being able to determine, had handed over for his investi- 

 gation. 



Fig.l. 



Fig. 2. 



^m^' 



Fig. 3. 



Fig. 1. A highly magnified view of the base of the tentacular appendage 

 and part of the nutritive organ, b, h. Groups of opake particles in 

 motion at these places, the circulation going on throughout the divisions 

 of the oblong vessel c. 



Fig. 2. The two animals united, as first taken. 



Fig. 3. The larger individual with the tentacular appendage. 



Fig. 4. The smaller individual. 



When viewed under a lens, the ridges of the body are seen to be serrated 

 along the edge. 



XXI. — Report of the Results of Researches in Physiological 

 Botany made in the year 1839. By F. J. Me yen, M.D., 

 Professor of Botany in the University of Berlin*. 

 [Continued from vol. vi. p. 429.] 



M. Unger, in a treatise on the organs of fructification of 

 Riccia glauca-\, has made a few but very important remarks 

 on the present question concerning the sexuality of Phanero- 



* Translated from the German, and communicated by Henry Croft, Esq. 

 t Linnaea von 1839, pp. 15-17. 



