Vo. I] STEWART—BOTANY OF THE GALAPAGOS ISLANDS 113 
on the inaccessible parts, no specimens were taken, but seen 
from a distance they had the general appearance of this species. 
Tower IsL.: common in various places, forming dense thickets 
3-4 ft. high. The specimens on this island are more erect than 
they are on Wenman, (no. 3005). WeENMAN IsL.: common 
in thickets on tops of the cliffs, and hanging down the sides of 
the same, (no. 3006). Plates XIII, fig. 1; XIV. Endemic. 
O. insularis, nov. sp. 
Fruticosa circa 1 m. alta; caule spinoso; spinis pungentibus non 
cauducis; ramis brevibus; articulis ovatis apice rotundatis griseo- 
viridibus, circa 3 dm. longis, 2 dm. latis; areolis orbicularibus tubercu- 
losis lanuginosis denique solum tomentellis; fasciculo 40-50 spinoso; 
spinis pungentibus flavescentibus inequalibus maximis 3 cm. longis; 
floribus fructuque ignotis. 
A species easily distinguished from the others on the islands 
by its smaller size, and the shorter and more numerous spines. 
ALBEMARLE IsL.: Tagus Cove, common on the sides of the 
tufa hills surrounding the cove. A low Opuntia with numerous 
short stiff spines was reported from the Banks Bay region of 
this island by Mr. F. X. Williams. From his description it 
seems likely that it is this species, (no. 3014). Plates IX, fig. 
1; XV. Endemic. 
O. myriacantha Weber in Bois, Dict. d’Hort. 894 (1898) ; 
Rob. (1), 181—ALBEMarRLE IsL.: Cowley Bay, occasional on 
the lower parts, and up to within a few hundred feet of the top, 
acc. to R. H. Beck; Iguana Cove, rare in the immediate vicinity 
of the cove but abundant a short distance on either side of it; 
Tagus Cove, fairly abundant on the rim of the crater at 4000 
ft. and at various places on the sides of the mountain; the speci- 
mens which occur here are smaller than is usually the case; 
Turtle Cove, common near the shore, specimens of large size; 
Villamil, very abundant on beds of basaltic lava on the lower 
parts, often forming forests 25-30 ft. in height ; most abundant 
below 100 ft., but found to some extent as high up as 550 ft., 
where the specimens are smaller in size than lower down; 
occasional on the floor of the crater at 2750 ft., (no. 3008). 
BARRINGTON Ist.: abundant everywhere, forming trees 12 or 
more feet in height. The photograph of the so-called O. gala- 
pageia, published by Hemsley, (5), fig. 75, is evidently of this 
species, as it does not show the broadly spreading crown so 
characteristic of O. galapageia. The photograph shows the 
