DECAPODS 187 
examined is from Luchydesma crassatelloides. Recorded by Lockington 
from the same locality, commensal, and collector, under the name of 
Fabia subquadrata, 
Genus Pinnixa White. 
PINNIXA OCCIDENTALIS Rathbun. 
Plate vu, fig. 4; plate 1x, figs. 6, 6a. 
Distribution.—Unalaska to Humboldt County, California (Holmes). 
Shallow water to 238 fathoms. 
The specimen recorded by me in 1893, from San Diego, is P. Uittoralis 
Holmes. 
Harriman Expedition.—Juneau, 20 fathoms; Hot Springs; Sitka; 
Wrangell, in burrows of Achiurus (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: 
Sex. Station. Length of | | Widthof | "SPE ambu | of third ambuc 
Seances Usaha cara paeS latory leg. latory leg. 
fot 2862 7.5 mm 15.8 mm. 8.7mm 2.8mm 
g Wrangell 12 Bi 2.1 
2002 7:3 14.5 7 2.6 
2 Wrangell Uf 14.2 5.5 Sor 
I was at first led to believe that the Wrangell specimens represented a 
distinct species, but a reéxamination 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 vit, 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). 
