450 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii5 



Habitat. — Found living in mantle cavity of ab alone and occasion- 

 ally free, latter probably temporary state, owing to distm-bance of 

 normal host. The specimens examined have occm^red most commonly 

 with the pink ab alone, Haliotis corrugata Gray, but also with the red 

 abalone, H. rufescens Swainson, the black abalone, H. cracherodii 

 Leach, and the green abalone, H. fulgens PhUlipi. Mr. Keith Cox 

 reports them also from H. kamtschatkana Jonas, H. wallalensis 

 Stearns, H. sorenseni Bartsch, and H. assimilis Dall. 



Material.— The following specmiens were examined: 



Mexico. — Magdalena Bay, Belchers Point, on shore, Jan. 30, 1938, S. A. 

 Glassell, 1 specimen, dried. 



California. — La Jolla Cove, July 14, 1942, 1 female (Pacific Marine Station 

 845). — La Jolla, kelp beds, March 16, 1954, C. Limbaugh, 1 ovigerous female, I 

 male (USNM 96414). — La Jolla, with Haliotis rufescens Swainson, March 28, 

 1952, E. Dodge, 1 ovigerous female. — San Clemente Island, living beneath mantle 

 of Haliotis, January 1936, Nell Murbarger, 2 ovigerous females, 1 male (USNM 

 77743). — San Clemente Island, from abalone. May 8, 1888, Albatross, 2 females 

 (USNM 63453).— Laguna Beach, from abalone, Sept. 19, I9I8, W. A. Hilton, 

 I female, deep blue (LTSNM 53598). — Laguna Beach, shale reef ]/i mile offshore, 

 midway to Corona del Mar, 12 fathoms, from mantle cavity of Haliotis corrugata 

 Gray, April 25, 1958, Robert Given, from N. MacGinitie, I ovigerous female. — 

 Laguna Beach, off Salt Creek, 8 fathoms, from Haliotis corrugata Gray, May 21, 

 1958, Dale Seemen, from N. MacGinitie, 20 females (7 ovigerous), 5 males; 

 May 26, 1958, 7 females (5 ovigerous). — Laguna Beach, 8 fathoms, from Haliotis 

 corrugata (2 specimens from Haliotis rufescens), April 28, 1958, Dale Seeman, 

 from N. MacGinitie, 4 females (I ovigerous), 10 males. — Catalina Island, com- 

 mensal in shell of green abalone, Venice Marine Biological Station, 1 ovigerous 

 female (USNM 46119).— Catalina Island, Little Harbor, Dec. 27, 1912, Anton 

 Dohrn, 2 males (USNM 49977). — San Pedro, Rocky Point, from mantle of black 

 abalone, Feb. 2, 1912, Anton Dohrn, 1 ovigerous female (USNM 49975). — San 

 Pedro, in gill chamber of Haliotis cracherodii Leach, June 1930, E. P. Chace, 

 1 ovigerous female, blue-black when alive (USNM 64087). — Santa Barbara 

 Island, from Haliotis rufescens, 8 fathoms, Sept. 11, 1962, Keith W. Cox, 22 

 ovigerous females, 7 males. — Santa Monica Bay, Malibu Point, under mantle of 

 Haliotis washed up on beach, Dec. 19, 1937, A. Camp, from R. Crocker, 1 female 

 (Hopkins Marine Station). — Southern California, Nov. 27, 1913, Anton Dohrn, 

 1 female (USNM 49976). 



Notes. — Mr. Keith W. Cox informs me that there seems to be a 

 definite correlation in size between the shrimps and their hosts: 

 large shrimps in large abalones, small in small. The usual number is 

 one shrimp per host. Exceptions do occiu* and on several occasions 

 up to four have been found in the cavity between mantle and shell. 



MacGinitie and MacGinitie (1949, p. 279) state: 



We have found this shrimp with its purplish-red color form living in the mantle 

 cavity of the green abalone Haliotis fulgens. For over a year one has been living 

 under the protectorate of an abalone in one of our aquariums. It usually stays 

 with its head near the region of the mouth of the abalone, and although it is by 

 no means inactive, its host does not give any evidence of being disturbed by its 

 movements. On rare occasions we have seen it make short excursions onto the 



