DECAPODS 



I8 7 



examined is from Pachydesma crassatelloides. Recorded by Lockington 

 from the same locality, commensal, and collector, under the name of 

 Fabia subquadrata. 



Genus Pinnixa White. 



PINNIXA OCCIDENTALIS Rathbun. 



Plate vn, fig. 4 ; plate ix, figs. 6, 6a. 



Distribution. Unalaska to Humboldt County, California (Holmes). 

 Shallow water to 238 fathoms. 



The specimen recorded by me in 1 893, from San Diego, is P. littoralis 

 Holmes. 



Harriman Expedition. Juneau, 20 fathoms; Hot Springs; Sitka; 

 Wrangell, in burrows of Echiurus (T. Kincaid) ; Cape Fox. 



This species shows remarkable variation in the length and breadth of 

 the ambulatory legs, especially of the third pair, as is shown in the 

 accompanying table : 



I was at first led to believe that the Wrangell specimens represented a 

 distinct species, but a reexamination of the entire collection of P. occi- 

 dentalis shows intermediate forms. It may be added that station 2862, 

 which yielded the longest and slenderest legs, is also the greatest depth 

 (238 fathoms) from which the species is known. 



Small specimens often exhibit an almost complete absence of the car- 

 diac ridge. 



PINNIXA CALIFORNIENSIS Rathbun. 

 Plate vii, fig. 3. 



Distribution. from off Point Ano Nuevo, California, to Magdalena 

 Bay, Lower California; 13 to 51 fathoms. 



PINNIXA TUBICOLA Holmes. 



Distribution. "From Puget Sound to San Diego, California. Taken 

 by the Albatross off Point Conception, California, 31 fathoms, station 

 2908 ; in calcareous tube of worm, Trinidad, California (Holmes). 



