Circuit Court Judge Vincent Femia yesterday sentenced Barry Roger Jenkins, 34, to life in prison plus 85 years for a murder and several armed robberies.

The Prince George's state's attorney's office agreed last January not to seek the death penalty when Jenkins agreed to plead guilty to the murder of 25-year-old Samuel M. Moseley Jr., of the District, and the robberies.

Jenkins, who is from Silver Spring, admitted that he shot Moseley, an appliance store salesman, during a May 1982 robbery of Luskin's on Queens Chapel Road in Chillum. Jenkins also pleaded guilty yesterday to an armed robbery of a fast food store in Hagerstown, in a case transferred here from Washington County.

Alan Goldstein, one of Jenkins' attorneys, described him as a bright and articulate man who had become "a one-man crime wave for the sole purpose of obtaining drugs to support his habit."

Jenkins stood in the courtroom and apologized to Moseley's mother, Desimore Bynum, but said he had no answer for his behavior. "I cannot blame it on drugs, it's just an excuse--there is something inside of me that made me take the drugs . . . ."

Jenkins seemed controlled as Femia read off the various sentences. Attorneys estimated that Jenkins would be 75 years old when he becomes eligible for parole. Bynum, the victim's mother, said that she was satisfied with the sentence.