39 



Cacti.— Orcutt. 



40 



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MAMMILiLARIA MiEIACANTHA Bngclm. 



MAMMILDARIA MACR0MER13 Engc'.m. 



MAMMILtLARIA PECTINATA Engelm. 



MAM'MILLARI.V 



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teii.'> 



':0r 



M,AAIMILL.ARIA LASIACAXTHA Er.gelm. 



MAMMILbARlA WRIGHTII Enge'.m. 



