82 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
shore, forest trees 20-40 ft. high above 350 ft., (no. 1744) ; 
northwest side, common bushes above 100 ft., trees above 700 
ft., (no. 1743); southeast side, common bushes, forming 
almost impenetrable thickets, above 450 ft. It does not grow 
as large here as it does at Academy Bay. JAmeEs IsL.: James 
Bay, common bushes on the lower parts, small forest trees 
around 2000 ft., stunted bushes around 2850 ft. where it is 
exposed to the wind; northeast side, common bushes above 350 
ft. (nos. 1745-1746). NarsBorouGH Ist.: south side, Snod- 
grass and Heller. This species seems to be one of the favorite 
host plants for Phoradendron Henslovii. Owing to its long 
recurved thorns it is one of the most disagreeable bushes to 
contend with when traveling on the lower parts of the islands. 
Further distr. S. U. S., Mex., W. Ind., S. Am. 
SIMARUBACEAE 
Castela Turp. 
C. galapageia Hook. f. (3), 229, (4), 262; Rob. (1), 158.— 
ALBEMARLE IsL.: Cowley Bay, low bushes to 1100 ft. 
CuHatuam Ist.:' Darwin; Baur. Hoop Isz.: low bushes 
around 600 ft.; no specimens were taken. Endemic. 
Forma albemarlensis Rob. (1), 158. Forma jervensis Rob. 
(1), 159.—ALBemar_e IsL.: Tagus Cove, common bushes on 
the lower parts (no. 1747) ; Villamil, common bushes on lava 
beds to 200 ft. (no. 1762). INDEFATIGABLE IsL.: northeast 
side, common bushes 6-8 ft. high in loose ashy soil near the 
shore. Stem unarmed; leaves for the most part cuneate with 
revolute margins, but some are obtusely oblong and mucronate 
as in the specimens from Albemarle, (no. 1748); northeast 
side, occasional bushes on the lower parts. The specimens 
from this part of the island are armed, leaves usually oblong 
obtuse mucronate, but some are lance-oblong acute, (no. 
1749) ; southeast side, common bushes to 600 ft. Stem un- 
armed; leaves oblong obtuse mucronate, (no. 1750). JERVIS 
Ist.: Baur. Considering the great variability of the forms as 
shown by subsequent specimens, the form jervensis seems to 
agree rather too closely with the type specimen of form albe- 
marlensis to be considered as a good form. NARBOROUGH 
Ist.: north side, bushes 5-6 ft. high on lava beds (no. 1651). 
