X0303 4 2008-10-16 0 0001172358 DORCHESTER MINERALS LP DMLP 0001199321 PEAK PRESTON A 3838 OAK LAWN AVE STE 300 DALLAS TX 75219 1 0 0 0 Common Units 2008-10-16 4 J 0 358486 D 0 I .. Common Units 358554 I .. Common Units 1000 I .. Common Units 488711 I .. Common Units 12179 I .. Mr. Peak ceased to be the trustee of the Martha Ann Peak Trust effective October 16, 2008 and disclaims any beneficial ownership of those common units owned by the Martha Ann Peak Trust. Mr. Peak disclaims beneficial ownership of those common units owned by the Mary Lee Peak Trust. Mr. Peak is the trustee of the trust. The common units are held by Hugoton Nominee, Inc. Mr. Peak and his spouse are the beneficiaries of the Peak Revocable Living Trust, which is the shareholder of Hugoton Nominee, Inc. The common units are held by the Peak Revocable Living Trust. Mr. Peak and his spouse are the beneficiaries of the Peak Revocable Living Trust and Mr. Peak is the trustee of the trust. The units are held by 4MP Corp. The Peak Revocable Living Trust is the shareholder of 4MP Corp. Mr. Peak and his spouse are the beneficiaries of the Peak Revocable Living Trust and Mr. Peak is the trustee of the trust. Preston A. Peak 2008-10-27