CACTACE. 507 
50. Mamillaria crinita, DC. Rev. Cact. p. 112, et Mém. Cact. t. 3. 
Sourn Mexico, Zimapan (Coulter), Rancho de San Antonio (Ehrenberg). 
51. Mamillaria crocidata, Lem. Cact. aliq. Nov. fasc. i. p. 9. 
SourH Mexico, Mineral del Monte (Lhrenberg). 
52. Mamillaria crucigera, Mart. in Act. Nov. Nat. Cur. xvi. pt. 1,p. 346, t. 25. 
fig. 2. 
Mexico, in temperate regions (Aarwinski). Hort. Kew. 
53. Mamillaria curvispina, Otto, in Otto & Dietr. Allg. Gartz. xiv. p. 204. 
MEXICO. 
This is perhaps a variety of M. discolor. 
54. Mamillaria cylindracea, DC. Rev. Cact. p. 111. 
Mexico (Coulter). 
55. Mamillaria dealbata, A. Dietr. in Otto & Dietr. Allg. Gartz. xiv. p. 309; 
Salm Dyck, Cact. ed. 2, p. 89. 
MEXxIco. 
56. Mamillaria decipiens, Scheidw. in Bull. Acad. Brux. v. p. 496; Walp. 
Rep. ii. p. 297. 
Mamillaria guilleminiana, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. p. 48. 
Mexico. Hort. Kew. 
57. Mamillaria densa, Link et Otto, Ic. Pl. Rar. t. 35. 
Sourn Mexico, Zimapan (Ehrenberg). Hort. Kew. 
Pfeiffer makes this var. 6 of M. echinata. 
58. Mamillaria depressa, Scheidw. in Bull. Acad. Brux. v. p. 494; Walp. Rep. 
ii. p. 301. 
Mexico. Hort. Kew. . 
Referred to UM. adunca by Salm Dyck, Cact. ed. 2, p. 16. 
59. Mamillaria diadema, Miihlpf. in Otto & Dietr. Allg. Gartz. xili. p. 346; 
Walp. Rep. v. p. 810. 
Sourn Mexico, Real del Monte (ex Mihlenpfordt). 
60. Mamillaria disciformis, DC. Rev. Cact. p. 114, et Mém. Cact. p. 14. 
Mexico, without locality (Coulter). 
61. Mamillaria discolor, Haw. Syn. p.177; Salm Dyck, Cact. ed. 2, pp. 11, 95 ; 
DC. Rev. Cact. p. 28, t. 2. fig. 2. 
Mamillaria depressa, DC. Cat. Hort. Monsp., ex DC. loc. cit. 
Var. B. albida, Salm Dyck, loc. cit. p. 11. 
Var. y. aciculata, Salm Dyck, loc. cit. 342 
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