AND PORTO SANTO. 63
conceived from the drawing, Plate 6, which gives the different
appearances and colours of the tufa, of the dark scoriaceous matter
between, of the imbricated-looking basalt beneath, and of the
principal dike, which is three feet four inches wide; the smaller
sketch, Plate 3, D, taken from a higher point, and at a greater
distance, should be referred to at the same time. To the left of
the part represented in the larger drawing, the dikes descend
through red tufa, which reposes on scoriae. The descent to the
beach is rather difficult, and I slid the greater part of the way
over a black cinder, the basaltic masses above which are covered
with ivy. Walking close up to the dike, I found that the yellow
tufa was full of small, (occasionally intermixed with large) sharp,
irregular fragments of basalt, while the red generally contains
larger masses, and is more layer-like in its deposit. This slip has
evidently occurred from the giving way of the tufa; beneath the
basalt, covered by the sea. The euphorbia dendroides, the ruta
graveolens, and a new species of gnaphalium, grew close to the
beach, the latter extending itself up the rocks6. In the pores of
the nodules of basalt which had been rounded and thrown upon
the beach by the sea, I found the galeolaria elongata, and' the
vermilia bicarinata, both of which have been hitherto referred to
New Holland alonef. The latter was of the most' beautiftd rose
colour, gradually passing into white ; its double keel, sometimes
indented, and its aperture with two> teeth, would not admit of
any doubt; but the animal, as well as that of the galeolaria, had
perished.- Without a minute examination; 1 should have oroe
Genus Gnaphlmm; m tomentosum? Floribus flesculesis luteis, (fceminei herma-
phroditis mixti) corollulis integris, vix manifestos. Calyce peiSistent-e, imbricatb,
ventricbsb, squamis acuminatis, scariosis, luteis. Pappo capillare. Reeeptaculo
alveolato nudo. Caule suffruticose' raicemesb, FbHis altefnis, ovatis, bblbngis.
Fleribus terminalibus cerytnbbsis. Planta tota, valde tomentosa, can'ascens, odorata.
‘ Bewdich’s Elements of Conckology, Part II.