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covered with spines 1-2 inches long; joints 8-10 by 6-8 inches 
in length; spines J- - 1£ inches long. Ovary with nearly 50 pulvilli, 
while the foregoing species have not more than 20. 
ft Procumbentes. 
7. O. procumbens, E. & B. 1. c.: prostrata; articulis orbiculato- 
Obovatis grandibus pallide viridibus ; pulvillis remotis setas stramineas 
rigidas valde ineequales et aculeos 2-4 validos compressos angulatos 
stramineos basi obscuriores gerentibus. 
San Francisco mountains to ’Cactus Pass, in Western New Mex¬ 
ico. Joints 9-13 inches long, always edgewise ; pulvilli 1^-2 
inches apart; spines 1-2 inches long. Similar to O. Engelmanni , 
but prostrate, with more distant pulvilli, and stouter spines. No 
flower or fruit seen. • 
8. O. angustata, E. & B. 1. c.: prostrata vel adscendens,; articulis 
elongato-obovatis versus basin angustatis ; pulvillis remotis setas ful- 
vas graciles aculeosque paucos (2-3) validos compressos stramineos 
seu albidOs versus basin rufos deflexos gerentibus; bacca obovata 
tuberculata ; seminibus magnis. 
From Zuni, west of the Rio Grande, westward to the Cajon Pass, in 
the California mountains. — Joints 6-10 inches long, only 3 or 4 
wide. Spines similar to those of the last species; bristles much more 
delicate. Fruit l£ inches long; the umbilicus flat, but immersed..— 
Well distinguished by the shape of the joints. 
* * # Fulvispince. 
9. O. macrocentra, E. in B. C. R.: adscendens ; articulis magnis 
suborbiculatis tenuibus ; pulvillis subremotis setas graciles breves ful- 
. vas gerentibus, summis solum aculeos 1-2 prselongos subcompres- 
sos fusco-atros proferentibus; floris flavi ovario ovato; stigmatibus 
8 ; seminibus majusculis. 
Sand-hills on the Rio Grande near El Paso: fl. May. — Two or 
three feet high, with very striking round joints, 5-8 inches in diame¬ 
ter, and blackish spines as much as 2 or 3 inches long. Nearly allied 
to the next species. 
10. O. phjeacantha, E. in PI. Fendl. : diffusa, adscendens ; articu¬ 
lis obovatis crassis glaucescentibus ; pulvillis subremotis setas graciles 
stramineas seu fuscatas longiores gerentibus, plerisque aculeos 2-5 
plus minus compressos fuscos proferentibus ; floris flavi ovario abbre¬ 
viate ; stigmatibus 8 ; bacca cuneata pyriformi; seminibus majusculis. 
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