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,
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