506 CACTACEA. 
43. Mamillaria conoidea, DC. Rev. Cact. p. 112; Mém. p. 6, t. 2; Pfeiffer & 
Otto, Abbild. ii. t. 26. 
Mamillaria inconspicua, Scheidw. in Bull. Acad. Brux. 1838. 
Mamillaria diaphanacantha, Lem. Cact. Hort. Monv. p. 39. 
Norra Mexico, received from San Luis Potosi (Ehrenberg) ; Sout Mexico, Zimapan 
(Ehrenberg). | 
44, Mamillaria conopsea, Scheidw. in Bull. Acad. Brux. v. p. 494. 
Norta Mexico, San Luis Potosi (Lhrenberg); South Mexico, in tufts 1 to 2 feet 
across, in the Barrancas near Mestitlan and Ismiquilpan (Ehrenberg). 
This is referred by Labouret to I. phymatothela. 
45, Mamillaria cornifera, DC. Rev. Cact. p.111; Salm Dyck, Cact. ed. 2, p. 20 
et 131. 
Var. 6. implexicoma, Salm Dyck, Cact. ed. 2, p. 20. 
Var. y. mutica, Salm Dyck, loc. cit. 
Ehrenberg regards these forms as species, thus :— 
Mamillaria cornifera, DC. 
SoutH Mexico, about Zimapan, Ismiquilpan, Actopan, Pachuca, Mineral del Monte, 
7000 to 8000 feet (Ehrenberg). Hort. Kew. 
Mamillaria implexicoma, Salm Dyck. 
Nort Mexico, received from San Luis Potosi (Ehrenberg). 
Mamillaria mutica, Salm Dyck. 
Nortu Mexico, received from San Luis Potosi (Ehrenberg). 
46. Mamillaria corollaria, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. 294; 
Walp. Ann. ii. p. 677. 
Mexico. 
47. Mamillaria coronaria, Haw. Revis. Pl. p. 69; Pfeiff. Enum. p. 33. 
Cactus coronatus, Willd. Suppl. p. 30. 
Cactus cylindricus, Ort. Dec. p. 128, t. 16. 
Mexico (ex Pfeiffer); GUATEMALA (Pfeiffer). 
48. Mamillaria crassispina, Pfeiff. in Otto & Dietr. Allg. Gartz. viii. p. 406. 
Mamillaria floccigera, Otto, ex Labour. Cact. p. 42. 
Mamiilaria flaviceps, Scheidw., ex Labour. Cact. p. 42. 
Mexico. Hort. Kew. 
49. Mamillaria crebrispina, DC. Rev. Cact. p. 111. 
Mamillaria polychlora, Scheidw., ex Labour. Cact. p. 74. 
Norts Mexico, San Luis Potosi (ex Labouret), from the same place, though very rare 
(Galeotti), without locality (Coulter). 
