CORRECTIONS. T7 
seminal coat, which is distinguished from arillus proper only by its being already fully formed 
at the flowering period. 
Page 49, line 16, for Tuna, read Ficus Indica. . 
Page 49, line 24, for faro, read flavo. 
Page 51, line 42, after 20-30 put ,. 
Page 52, line 29, after ovata; omit ; and read: aculeolis inaequalibus armata ; umbilicoinfun- 
dibuliformi ; seminibus, etc. 
Page 53, line 37, put setosissimis before stipata. 
Page 54, line 16, for pulvillis, read pulvilli. 
Page 54, line 17, after Seeds, insert very different in size and shape. 
Page 54, line 18, after fruit put ,. 
Page 54, line 34, for ovata, read obovato—. 
Page 54, line 34, after clavata put ,. 
Page 55, line 8, for folti, read foliis. 
Page 56, line 13, for first, read fruit. 
Page 57, line 14, omit numerosis. 
Page 58, line 14, for 1012, read 10-12. 0. arborescens seems to be very closely allied, if not 
identical, with O. rosea, DC., and O. imbricata, DC. The former-is described from a figure ; 
the flower and fruit of the latter remain unknown, so that it is difficult, if not impossible at 
present, to solve these doubts. 
Page 59, line 4, for Bubuquibari, read Babuquibari. 
Page 59, line 30. O. Wrightit may not be different from 0. Kleiniae, DC., from Mexico, 
long cultivated in Europe, the flower of which does not seem to be known. 
Page 60, line 21. 0. frutescens seems identical with O. gracilis, Hort. Monac, and 0. 
virgata, Hort. Vind., the flower and fruit of which are unknown. It is stated that the spines of 
O. gracilis are not vaginate. This is no doubt a mistake; but the sheath is probably not as 
loose as in others. It corresponds, therefore, with my var. brevispina, Synops. Cact. in Proc. 
Am. Ac. A. Sc., vol. III. In delicate specimens, and such are usually the cultivated ones, the 
spines of most of the cylindric Opuntiae do not exhibit the sheath very plainly ; it usually 
adheres closely to the body of the spine. This vagina consists, like the whole spine, of elon- 
gated indurated cells; the barbs of the spine are covered by it and are closely adpressed until 
the vagina detaches itself which commonly takes place very early. 
Page 61, column 2 line 30, for 2, read 64. 
Page 61, column 2, line 39, for Goodrichii, read Goodridgii. 
Page 62, column 1, line 25, omit entirely. 
Page 62, column 2, line 10, for 6, read 68. 
Page 64, line 14, for Goodrichii, read Goodridgit. 
Page 66, line 13, before 14, put 12 and 13, bunches of spines of this variety ;. 
Page 68, line 18, for nuéfallis read Nuttallit. 
Page 68, line 24, for Chihauhua, read Chihuahua. 
Page 68, the map (not maps) mentioned in the two last lines has been necessarily left out. 
Mr. Paulus Roetter, of St. Louis, made the drawings for the plates under the close superin- 
tendence of the author. The steel engravings were done partly by Mr. W. H. Dougal, of 
Georgetown, D. C., a few by Messrs. Maillard & Connor, of St. Louis, and the balance by 
