THE GKAPSOID CBABS OF AMEKICA. 103 



fingers much shorter than palm, a little gaping, tips crossing, im- 

 movable finger nearly horizontal, dactylus with a large tooth just 

 behind middle which fits into a corresponding sinus in the propodal 

 finger ; this last has a small tooth at base. 



Legs slender, glossy, both margins of merus and dactylus and 

 posterior margins of carpus and propodus pubescent ; relative length 

 of legs 2. 3. 1. 4 ; propodites with convex anterior margins, first and 

 fourth pairs with straight, and second and third with concave, pos- 

 terior margin, dactyli curved, much shorter than preceding segment. 

 Abdomen much larger than carapace. 



Color. Female (49627), the greater part of the carapace, especially 

 the antero-lateral regions and a broad, longitudinal stripe on the 

 abdomen, are orange chrome in a formalin-preserved specimen; re- 

 mainder of specimen whitish. 



Measurements. Female (23928), length of carapace 10, width of 

 same 12.5 mm. 



a 



Vio. 54. FABIA SCBQOADBATA. a, VENTBAL vu;w OF TKONT AND MUI : TH. KNI.AKGKI>; {/, BND 



OF A LEG, ENLARGED. (AFTER DANA.) 



Habitat. Commensal in bivalve mollusks. 



Range. From off Akutan Pass, Alaska, to Laguna Beach, Cali- 

 fornia. To a depth of 45 fathoms. 



Material examined. 



Off S. entrance to Akutan Pass, Alaska; lat. 53 56' N. ; long. 

 165 56' TV.; 45 fathoms; brk. Sh. P.; temp. 43.5 F.; July 28, 1888; 

 station 2843, Albatross; 1 female (17480). 



Hammond Bay, Vancouver Island, British Columbia; in My a 

 arenaria; May 20, 1916; C. McLean Fraser; 1 female (49627). 



Oyster Bay, Washington; from "butter" clam; Dec. 5, 1914; 

 Biological Survey, U. S. Department of Agriculture ; 1 female ovig. 

 (coll. Biol. Surv.). 



Pacific Grove, California; from mantle cavity of Mytilus edulis; 

 John C. Brown; 2 females (23928). 



Pacific Grove; 9 females (3 ovig.) and 1 y. female in Mytilus (Mus. 

 Stanford Univ.). 



Laguna Beach, California; William A. Hilton; sent to United 

 States National Museum for- identification. 



