522 CACTACER. 
Var. 6. octospina, Scheidw. in Bull. Acad. Brux. vi. p. 5. 
MExico. 
210. Mamillaria salm-dyckiana, Scheer in Otto & Dietr. Allg. Gartz. 1850 ; 
Seem. Bot. Voy. ‘ Herald,’ p. 289. 
Norta Mexico, Chihuahua (Potts). 
211. Mamillaria saxatilis, Scheer in Seem. Bot. Voy. ‘ Herald,’ p. 286. 
Norta Mexico, crevices of rocks, Chihuahua (Potts). 
912. Mamillaria scepontocentra, Lem. Cact. Gen. et Sp. Nov. p. 43. 
Sour Mexico, Oaxaca, on vegetable mould in the prairies near Pachuca, above 
6000 feet (Galeotti). 
213. Mamillaria schaeferi, Fennel in Otto & Dietr. Allg. Gartz. xv. p. 66. 
MEXICO. 
914. Mamillaria scheerii, Miihlpf. in Otto & Dietr. Allg. Gartz. xv. p. 97, 
t. 2; Engelm. Cact. U.S. et Mex. Bound. Surv. p. 10. 
Texas.—Norta Muxico, Chihuahua (Potts); Sourn Mexico, Real del Monte. 
215. Mamillaria scheidweileriana, Otto, ex Scheer in Seem. Bot. Voy. 
‘Herald,’ p. 286. | 
Norte Mexico, Chihuahua (Potts), San Luis Potosi (Ehrenberg). Hort. Kew. 
216. Mamillaria schelhasii, Pfeiffer, Cat. Hort. Monv. 1846. 
SoutH Mexico, Mineral del Monte, Actopan, and Ismiquilpan (Ehrenberg). 
217. Mamillaria schiedeana, Ehbrb. in Salm Dyck, Cact. ed. 2, p. 85; Labour. 
Cact. p. 66. 
Mamillaria sericata, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. p. 44. 
Sourn Mexico, Mineral del Monte, on limestone, Puente de Dios, Barrancas near 
Mestitlan, 4000 to 5000 feet (Hhrenberg). Hort. Kew. 
218. Mamillaria schlechtendalii, Ehrb. in Linnea, xiv. p. 377. 
Mexico, near San Onofre, in the Mineral del Doctor (Ehrenberg). Hort. Kew. 
219. Mamillaria scolymoides, Scheidw. in Otto & Dietr. Allg. Gartz. ix. p. 44. 
Mamillaria daimonoceras, Lem., ex Salm Dyck, Cact. ed. 2, pp. 20 et 181. 
Mexico, received from San Luis Potosi (Ehrenberg), about Santa Rosa (Bigelow). 
Var. 6. longiseta, Salm Dyck, Cact. ed. 2, p. 132. 
Var. y. nigricans, Salm Dyck, loc. cit. 
Var. }. raphidacantha, Salm Dyck, loc. cit. 
920. Mamillaria seemannii, Scheer in Seem. Bot. Voy. ‘ Herald,’ p. 288. 
Nortu Mexico, Durango (Seemann). 
