254 University of California Publications in Zoology [Vol. 23 



Characters. — Carapace smooth, glossy, membranaceous, subquadrate in out- 

 line, with the angles broadly rounded; the space between the longitudinal sulci 

 is longer than wide and slightly narrowed behind; anterolateral margin rounded 

 and marked by round cluster of pits; front abruptly turned down, with a shallow 

 transverse sulcus covered with pubescence. Antennules obliquely plicated in very 

 wide fossettes. Last joint of outer maxilliped reaches the end of the preceding 

 joint. Palm of chela widens a little distally and is furnished with two rows of 

 hair below, the inner one of which is continued to the end of the immovable 

 finger. 



Dimensions. — Type, female: length of carapace 12.2 mm., width 14.3 mm. 



Type Locality. — Puget Sound. 



Distribution. — Alaska to Laguna Beach, California (Eathbun). 



Remarks. — Commensal in bivalve mollusks: My a and Mytilus (Eathbun). 



Fabia lowei Rathbun 



Plate 39, figures 3 and 4 



Fabia subquadrata Holmes, Occas. Papers Calif. Acad. Sci., 7, 87, 1900 



(part). 

 Raphonotus lowei Eathbun, H. A. E., 10, 186, text fig. 93, 1904. 

 Fabia lowei Eathbun, Bull. U. S. Nat. Mus., 97, 104, text fig. 55, pi. 24, 



figs. 2, 4, 1918. 



Fig. 151. Fabia lowei, chela, 5 X 4 (after Eathbun). 



Characters. — Very similar to F. subquadrata, with carapace a little wider; 

 turned-down front naked, with no trace of a transverse groove. Last joint of 

 outer maxilliped does not reach the end of the preceding joint. Palm of chela, 

 not widening distally, its margins subparallel or a little convex; lower surface 

 with but one line of hair, which is continued to the end of the immovable finger; 

 fingers less arched and less gaping than in F. subquadrata. 



Dimensions. — Type, female: length of carapace 10 mm., width 12.5 mm. 



Color. — In life whitish in color; carapace and abdomen largely orange color 

 (Holmes, as F. subquadrata). 



Type Locality. — San Pedro Bay, California. 



Distribution. — Santa Monica Bay to San Diego, California (Eathbun). 



Remarks. — Commensal in bivalve mollusks : Pholas, Pachydesma, Modiola and 

 Paphia ( Eathbun) . 



Fabia canfieldi Rathbun 



Plate 39, figures 5 and 6 



Raphonotus subquadratus Eathbun, H. A. E., 10, 186, 1904 (part: specimen 



from Monterey). 

 Fabia canfieldi Eathbun, Bull. U. S. Nat. Mus., 97, 106, text fig. 57, pi. 24, 

 figs. 5 and 7, 1918. 

 Original Description of Female. — Carapace of unique specimen very soft and 

 so crushed as to be for the most part beyond description. Front devoid of hair 

 and with a short, longitudinal median depression. 



