Absent an abuse of discretion, there is no error in denying a petition under G. L. c. 211, § 3. In his brief the plaintiff states, "If my appeal had to be based on an abuse of discretion, I do not think that I could mount one, because I cannot bring myself to think that the... [single justice’s] decision, here appealed, constitutes an abuse of discretion.” We agree with the plaintiff that the denial of his petition was not an abuse of discretion.

We have, nonetheless, examined the records before the Appeals Court. All the issues raised by the plaintiff before us are presently pending in that court. We think, therefore, the plaintiff’s substantive rights are protected through the normal appellate process.

However, in our review it appeared that there is no appeal presently pending from an assessment of two hundred and fifty dollars costs on March 29, 1978. We think the plaintiff is entitled to bring new proceedings in the county court to determine the correctness of that assessment. The plaintiff should serve the Attorney General instead[*908] of the present defendent in his new petition.

The denial of the petition is affirmed with leave to file a new petition as described herein.

So ordered.