1921] Schmitt: The Marine Decapod Crustacea of California 253 
separated by a faint line, the last one slightly concave on the margin; fifth and 
sixth abdominal segments broader than long; terminal segment subrectangular. 
Dimensions.—Type, male: length 4.7 mm., width 4.2 mm. 
Type Locality——False Bay, San Diego County, California. 
Distribution.—British Columbia to San Diego, California. 
Remarks.—Commensal in bivalve mollusks: Cardita, Kellia, Donazx, Mya, 
Mytilus, and ascidians: Phallusia; sometimes free-swimming (Rathbun). 
genus Fabia Dana 
Carapace smooth, more or less membranaceous, not much wider than long, 
suborbicular or subquadrate, marked with a pair of longitudinal sulci enclosing 
the median area. Outer maxillipeds with ischium rudimentary and merus large; 
palp three-jointed, third joint articulated on the inner margin of the preceding 
one. Ambulatory legs subequal and rather slender; second pair longest. 
Key TO THE CALIFORNIA SPECIES OF FABIA 
I. Legs of second ambulatory pair alike. 
A. Turned-down front, with a shallow transverse suleus which is covered 
with pubescence. Palm of chelipeds widened distally. (Not known 
south of Laguna Beach.) b rat 953 
subquadrata, p. 253. 
B. Front naked, without trace of a transverse groove. Palm of chelipeds 
not widened distally. (Not known north of San Pedro.) 
lowei, p. 254. 
II. Legs of second ambulatory pair unlike, the right longer than the left. Front 
naked, with a short longitudinal median depression. Palm of chelipeds 
widened distally. (Kuown only from Monterey.) : 
canfieldi, p. 254. 
Fabia subquadrata (Dana). 
Plate 39, figures 1 and 2 
Fabia subquadrata Dana, Proc. Acad. Nat. Sci. Phila., 5, 253, 1851; Crust. 
U. 8. Expl. Exped., 1, 382, 1852, pl. 24, fig. 5, 1915; Holmes, Occas. 
Papers Calif. Acad. Sci., 7, 87, 1900 (part). 
Raphonotus subquadratus Rathbun, H. A. E., 10, 186, 1904; Weymouth, 
Stanford Univ. Pubi., Univ. Ser., no. 4, 55, fig. 2, 1910. 
Fabia subquadrata Rathbun, Bull. U. S. Nat. Mus., 97, 102, fig. 53, pl. 24, 
figs leas LOUIS: 
(CSS 
a 7) 
Fig. 150. Fabia subquadrata, 9, X 1%; a, chela; b, dorsal view of carapace 
(after Weymouth). 
