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In connection with a study of the scaled polychaetes of San Juan Archipelago and adjacent regions, a check was made on the types of the species
Gattyana imbricata Treadwell (Treadwell, 1926), the specimens of which were kindly lent to me by the American Museum of Natural History. The parts of nine specimens labeled by Treadwell as
G. imbricata Treadwell proved to involve six species – five known and one unknown. The specimen of the latter species (see below, under new species) was not used in the original description of
G. imbricata by Treadwell. He used three specimens which proved to be
G. cirrosa (Pallas) and
Evarnella triannulata (Moore), thus making
Gattyana imbricata Treadwell an invalid species. The polychaetes were collected by Capt. R. A. Bartlett in Alaska in the general region of Bering Strait in 1924, under the auspices of the National Geographic Society. The species represented and the localities where they were obtained are as follows.