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. 



Bemarks. — Commensal in bivalve mollusks: Cardita, Kellia, Donax, Mya, 

 Mytilus, and ascidians: Phallusia; sometimes free-swimming (Bathbun). 



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 masillipeds 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 sulcus which is covered 



with pubescence. Palm of chelipeds widened distally. (Not known 



south of Laguna Beach.) 



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. (Known 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. S. Expl. Exped., 1, 382, 1852, pi. 24, fig. 5, 1915; Holmes, Occas. 



Papers Calif. Acad. Sci., 7, 87, 1900 (part). 

 Baphonotus subquadratus Bathbun, H. A. E., 10, 186, 1904; Weymouth, 



Stanford Univ. Publ., Univ. Ser., no. 4, 55, fig. 2, 1910. 

 Fabia subquadrata Bathbun, Bull. U. S. Nat. Mus., 97, 102, fig. 53, pi. 24, 



figs. 1, 3, 1918. 



Fig. 150. Fabia subquadrata, 5, X 1%; a, chela; b, dorsal view of carapace 

 (after Weymouth). 



