A thread-leg shrimp, Nematocarcinus sp., was photographed at 870 m off the San Juan Seamount off California. The shrimp was not collected. The color pattern is very different from previously described northeastern Pacific species of Nematocarcinus. The image in the photograph is too distant to see characteristic details of the rostrum. A previous report of Nematocarcinus exilis (Spence Bate, 1888) from Oregon cannot be verified, so this is the first well-documented report of this family in the eastern Pacific north of Mexico.