430 Scientific Proceedings, Royal Dublin Society. 



MONO COTYLED ONES. 



OoMMELYNACEtE. 



Tradescantia virginica. — Stamen thickly covered with dark 

 blue hairs, in which, as is well known, the rotation of the cell sap 

 can be seen. Thej are pluricellular, much constricted at the 

 septa, so as to form a bead-like structure, 



Tradescantia zebrina and Commelyna ccelestis present similar 

 hairs. 



LiLIACEiE. 



Yucca sp. — Hair on filament very thick; rather short and ob- 

 tuse ; unicellular, with longitudinal striae ; wall (proportionately) 

 thin. Diameter '005 (pi. xix., fig. 15). 



Narthecium ossifragum. — Hairs on filament; pluricellular, rather 

 slender, obtuse ; wall delicate ; closely striate, with spiral striae ; 

 each cell containing a considerable number of bright orange 

 globules of various sizes and shapes, probably oil of some kind. 

 Diameter '0010 (pi. xix., fig. 22). 



DESCEIPTION OF PLATES XIX. and XX. 

 PLATE XIX. 



On Plate XIX., figs. 1, 4, 5, 7, 12«, 15, 20, are magnified about 40 diameters; figs. 2, 3, 

 6, 8, 9, 10, 11, 12 5, 13, 14, 16, 17, 18, 19, 21, 22, about 175 diameters. 



1 . Malva moschata. 



2. Cuphea zimapani. 



3. Eriostemon neriifolius. 

 Hair on upper portion of filament. 



4. Eriostemon neriifolius. 

 Hair from lower portion of filament. 



5. Campanula medium. 



6. Oxalis lasiandra. 



7. Lobelia cardinalis. 



8. Lobelia erinus. 



9. Nerium oleander. 



10. Antirrhinum majus. 

 Basal bair. 



11. Browallia elata. ^ 



12. Celsia arcturus. 

 a. Group of bairs ; b. Single bair bigbly magnified. 



