180 PROCEEDINGS OF THE AMERICAN ACADEMY. 
obtusis 1 cm. altis ope sulcorum acutorum separatis; areolis orbicularibus 
3.5 mm. diametro tomento brevi tectis; spinis 20-25 in radiales et cen- 
trales non distributis rectis pungentibus maximo 4.5 cm. longo; floribus 
circa 10-11 cm. longis; ovario tereti squamato; squamis sparsis 1-1.5 
mm. longis ovatis acutis; perigonii tubo gracili paucis bracteolis brevibus 
ornato; lobis exterioribus subspathulatis 3 cm. longis apice eroso- 
denticulatis, interioribus brevioribus angustioribus acuminatisque; 
staminibus prope faucem perigonii affixis 2 cm. longis; stilo florem 
fere aequante ; stigmatibus 11 fere 2 cm. longis filiformibus; fructu 
duro strato exteriori perfirmo ovoideo acuto flore marcido coronato 7 cm. 
longo 8 cm. diametro; seminibus haud numerosis (ovulis plurimis _ 
abortivis) disciformibus 1 mm. diametro nigris lucidis leviter foveolatis.” — 
ABemarLe Ist.: Pt. Christopher, Snodgrass & Heller, nos. 933 
(hb. Berl. & hb. Gr.), 934 (hb. Berl. & hb. Gr.) ; Black Bight, Snod- 
grass & Heller, no. 935 (hb. Berl. & hb. Gr.). “ Note. — There is only 
one species in the Galapagos Islands which may be compared with this, 
namely C. galapagensis, Weber. The characterization of the latter is, 
however, so imperfect that I cannot identify my species with it.” [K. Sch. 
in litt.]. Endemic. In his field notes Mr. Heller reports a giant 
Cereus on Bindloe (where rare), Chatham, James, and Narborough: 
Islands which was probably C. sclerocarpus. It grew upon barren lava. 
C. Toovarsu, Weber, Bull. du. Mus. d’hist. nat. Paris, 1899, p- 312 
(1899). — Cuartes Ist.: Du Petit-Thouars. Endemic. Not satis- 
factorily described. 
OpunTIA, Raf. 
>  O.Gaxapacera, Hensl. Mag. Zodl. & Bot. i. 467, t. 14, f. 2 (1837); 
Hook. f. (3), 223; Anderss. (1), 224, & (2), 95; Hemsl. Gard. Chron. 
‘ser. 3, xxiv. (1898), p. 265, f. 75; Lindberg, Monatschr. Kakteenk. 1v- 
120-122, 134-135, & v. 10; K. Schumann, ibid. ix. 19, 20, x. 178, & 
Gesammtbeschr. Kakteen, 747.— Cuartes Ist.: Hassler Exp., ace. 
ms. note of Engelm. (hb. Mo. Bot. Gard.). James Ist.: Darwin; 
Hassler Exp., acc. to ms. note of Engelm. (hb. Mo. Bot. Gard.). JERVIS 
Ist.: Hussler Exp., acc. to ms. note of Engelm. (hb, Mo. Bot. Gard.). 
Endemic. © 
O. Helleri, K. Sch. nov. sp. in litt., “humilis plus minusve prostrata 
30-60 cm. alta dense caespitosa ramosa ; articulis lineari-oblongis 4p!¢¢ 
basique acutis planis 11 em. longis 4 cm. latis tenuibus apice setis fuscis 
munitis; areolis orbicularibus 2 mm. diametro non manifeste in tuber- 
eulis editis capillis paucis albis tectis etiam tomento flavido in parte 
