Dall, W. H. 1908. Reports On The Dredging Operations Of The West Coast Of Central America to the Galapagos, to the west coast of Mexico, and in the Gulf of California, in charge of Alexander Aggasiz, carried on by the U.S.Fish Commission Steamer Albatross during 1891. 43(6) 214,261,291, pl. 3, fig. 1.