22 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XI. 
Spine with large inrolled base—Continued. 
Flowers moderate (scarcely 65 mm.) with rather shallow (5-10 mm.) tube—Continued. 
Spine conical rather than mucronate—Continued. 
Prickles minute. 
Spine:moderate; prickles notlenticular-based =e --en-see ee eee ee eee eee A. caribaeicola. 
Spine rather slender; prickles lenticular-based...........-.-..-...----..-.---2----- A. Eggersiana. 
Flowers large (about 80 mm.) with deep (12-15 mm.) tube. Spine recurved, subconical............ A. barbadensis. 
Spine solidly conical. 
Spine short and heavy, openly grooved: prickles/slender-- <=. = 25222205222.) ee ee ee A. unguiculata. 
Spine elongateds slit; prickles broadly jtrianm cul arses eee eee lea eel reee eeee teria A. ventum-versa. 
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