304 Mr. J. Miers on the genus Browallia. 



just forming ; k, outer wall of last-formed cell exhibiting bud in 

 second stage of development ; /, lining membrane of ditto ; m, bud 

 as it appears at first. 



Fig. 6. Terminal cell exhibiting bud in third stage of development : a, outer 

 wall of cell ; b, lining membrane ; c, bud ; d, tentaciUar sheath ; 

 e, polype-retractors just making their appearance. 



Fig. 7. Enlarged view of a portion of the polype of P. procumbens exhibit- 

 ing reproductive system : a, oesophagus ; b, stomach ; c, intestine ; 

 d, supposed ovary with the egg, e, attached ; /, membranous en- 

 velope of the egg ; g, lower filament supposed to be connected 

 with the reproductive system. 



Plate V. 



Fig. 1. Polypidom of Paludicella procumbens slightly enlarged. 



Fig. 2. A portion of ditto much enlarged, exhibiting two or three series of 

 cells. 



Fig. 3. A patch of Plumatella Allmani magnified two times, comprising se- 

 veral polypidoms. 



Fig. 4. Two or three polypidoms of ditto more highly magnified, exhibiting 

 the polypes exserted and the envelope of the originating egg a a. 



Fig. 5. A single cell of same still more highly magnified : a, keel or ridge 

 on the upper surface of cell. 



Fig. 6. Plumatella punctata five or six times magnified, exhibiting polypes 

 exserted : a, envelope of originating egg. 



Fig. 7' Three cells of ditto more highly magnified and more produced than 

 usual, with the polypes exserted. 



XIX. — Contributions to the Botany of South America. 

 By John Mters, Esq., F.R.S., F.L.S. 



[Continued from p. 35.] 



Browallia. 



The affinity of Browallia with Salpiglossis is sufficiently evident, 

 but in many respects it approaclies very closely to Petunia. In 

 the tabular arrangement suggested on a former occasion [huj. 

 op. iii. p. 172), Browallia was associated with the Salpiglossidece, 

 on account of the apparent aestivation of its corolla, combined 

 with its other characters. I regret very much, that since my 

 attention has been directed to this investigation, I have had no 

 opportunity of examining a flower in its living state, as by this 

 means only could its precise mode of prsefloration be ascertained : 

 it is certainly not imbricative as in Franciscea, but is either re- 

 plicative or reciprocative, as in Petunia or Salpiglossis-, judging 

 from its appearance after being pressed and dried, it seems to 

 be rather that of the last-named genus. The following generic 

 features have been derived wholly from an examination of dried 

 specimens : — 



Browallia, Linn. (char, reform.). — Calyx tubulosus, subcyliu- 

 dricus, 10-ncrvis, o-dentatus, dentibus inseqiialibus, 3-nerviis, 



