[The following paragraph of AS 1205 was effective for audit reports issued between December 31, 2016, and June 30, 2017. The current standard can be found  here.]

.07        When the principal auditor decides that he will make reference to the audit of the other auditor, his report should indicate clearly, in both the introductory, scope and opinion paragraphs, the division of responsibility as between that portion of the financial statements covered by his own audit and that covered by the audit of the other auditor. The report should disclose the magnitude of the portion of the financial statements audited by the other auditor. This may be done by stating the dollar amounts or percentages of one or more of the following: total assets, total revenues, or other appropriate criteria, whichever most clearly reveals the portion of the financial statements audited by the other auditor. The other auditor may be named but only with his express permission and provided his report is presented together with that of the principal auditor.3

3 As to filings with the Securities and Exchange Commission, see Rule 2-05 of Regulation S-X.