440 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



Range. — Newport Harbor, Calif., to Sitka, Alaska. 



Habitat. — Intertidal, possibly partly commensal in the burrows of 

 the mud shrimp Upogebia pugettensis (Dana) or the ghost shrimp 

 Callianassa californiensis Dana. Individuals have been collected from 

 pools formed in the depressions left by boulders on a gravelly beach; 

 the openings of the burrows of the mud shrimps occur in the sides of 

 these pools. Others have been found by chance when excavations 

 were being made for mud or ghost shrimps, and one was found out of 

 water between two slabs of sandstone. In only one locality have the 

 shrimps been found in any numbers: in the oyster dike area of Oak- 

 land Bay, Puget Sound, where they were under logs, shells, and 

 debris near the low tide mark, and in the trickle of water leaking from 

 dikes (Dr. J. S. Laurie). 



Material. — The following specimens were examined: 



California. — Newport Harbor, N. MacGinitie, 1 male. — Monterey Bay, 

 Elkhorn Slough, Aug. 2, 1927, G. E. MacGinitie, 1 ovigerous female (Hopkins 

 Marine Station). — Monterey Bay, in muddy sand with Upogebia, July 3, 1951, 

 C. Hand, 1 male (USNM 92660)^ 



Washington. — Willapa Bay, muddy sand, in burrow of Callianassa californi- 

 ensis Dana, May 4, 1958, F. Clogston and R. U. Gooding, 1 male. — Puget Sound: 

 Oakland Bay, near Shelton, in oyster dikes under wood debris, June 28, 1942, 

 A. H. Banner, 1 ovigerous female; Oakland Bay, shore, Sept. 26, 1951, J. S. 

 Laurie, 1 female, 1 male; Oakland Bay, from under board, Aug. 4, 1952, J. S. 

 Laurie, 1 male; Oakland Bay, Aug. 19, 1952, J. S. Laurie, 2 males; Oakland Bay, 

 State Reserve Dikes, Sept. 16, 1952, J. S. Laurie, 43 females (1 ovigerous), 26 males, 

 1 juvenile; Oakland Bay, Ersudt's Ground, Nov. 2, 1952, J. S. Laurie, 9 females, 

 7 males; Seabeck, Sept. 18, 1928, 1 female; Warm Beach, June 8, 1931, I male. — 

 San Juan Archipelago: San Juan Island, Kanaka Bay, with Callianassa californi- 

 ensis Dana, July 31, 1956, R. U. Gooding, 1 ovigerous female; San Juan Island, 

 Garrison Bay, with Upogebia pugeltensis (Dana), Aug. 22, 1957, R. U. Gooding, 

 I male; Brown Island, with Upogebia pugeltensis (Dana), July 13, 1961, J. F. L. 

 Carl, 1 male. 



British Columbia. — Victoria: Cadboro Point, under boulder, April 7, 1950, 

 J. F. L. Carl, 1 female; Cadboro Point, in pool formed while digging for mud 

 shrimps, July 27, 1958, G. C. and J. F. L. Carl, 1 ovigerous female, 1 male. — East 

 coast of Vancouver Island: Departure Bay, north of Nanaimo, from stomach of 

 flounder, Pleuronichthys coenosus Girard, July 9, 1934, E. Kuitenen, 1 ovigerous 

 female (damaged); Departure Bay, under boulders, July 29, 1938, J. F. L. Carl, 

 3 females (2 ovigerous); Departure Bay, Aug. 8, 1938, J. F. L. Carl, 1 female; 

 Departure Bay, Aug. 10, 1938, J. F. L. Carl, 3 females, 2 males; Departure Bay, 

 Aug. 24, 1938, J. F. L. Carl, 5 females, 2 males; Departure Bay, March 23, 1939, 

 J. F. L. Carl, 1 female, 1 male; Hammond Bay, north of Nanaimo, muddy gravel, 

 with Upogebia pugeltensis (Dana), June 22, 1962, J. F. L. Carl, 11 females (3 

 ovigerous), 8 males; Hornby Island, between slabs of sandstone, July 7, 1959, 

 A. D. Carl, 1 male. — West coast of Vancouver Island, Clayoquot Sound, near 

 Kakawis, Meares Island, June 14, 1946, E. F. Ricketts, 1 male (USNM 84397); 

 Kyuquot, mudflat pool, July 10, 1958, G. C. Carl, 1 ovigerous female. 



Notes. — This is a very agile shrimp, inclined to "play possum" and 

 then to move very quicldy. Even in clear water, to see the animal 



