Explanation of illustrations. 



The figures of plate Y were drawn with the aid of Abbe's camera 

 lucida and with Zeiss microscope and afterwards reduced. 



Plate IV. 



Fig. 1 represents the whole plant of Pentaphragma ellipticum sp. nov., 

 diminished. 



— 2. One single flower seen fi-om above; the five openings of the nec- 



taries are shown as darker spots between the stamens. 



Plate V. 

 Pentaphragma ellipticum, anatomical détails. 



Fig. 1. Transverse section of ovary: h: empty nectarial pit, n: nectarium. 

 (Ocul. 1, Obj. a,.) 



— 2. Longitudinal section of mature ovule, cleared with Eau de Javelle. 



The long protruding embryosac is empty owing to application of 

 reagent. (Oc. 2, Obj. DD.) 



— 3. Transverse section of ovule; r: raphe; ej) (as in fig. 2): epithel 



covering embryosac; (Oc. 2, Obj. DD.) 



— 4. Part of cross section of ovary's inner wall at the beginning of 



formation of the large hairlike outgrowings of inner epiderm for- 

 ming the fleshy pulp surrounding the grains. (Oc. 1, Obj. DD.) 



— 5. Longitudinal section of nearly ripe seed; the brown testa, t, is 



made of one layer of very large colls, the inner walls of which are 

 considerably thickened and densely pitted, the outer walls being 

 thin and collapsing: ed: albumen: em few-celled embryo. (Oc. 4, 

 Obj. A.) 



— 6. Embryo of a nearly ripened seed. (Oc. 4, Obj. DD.) 



— 7. Transverse section of leaf; eo: upper epiderm; pa: assimilating 



layer; s: collecting layer; lu: spongy parenchyma; eu: epiderm of 

 lower surface. (Oc. 4, Obj. A.) 



— 8. Stoma and surrounding cells from lower surface of the leaf. 



(Oc. 1, Obj. DD.) 



— 9. Cross section of vascular system of the stem; ed: endodermis; 



J): pericycle; I: sieve-tube-bundles; k: vessels. 



