242 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Diagnosis. One side tooth. Striae mostly long. Sides very con- 

 vex in front. Merus of last leg entire behind. 



Description. A large species. Carapace not much broader than 

 long, covered, except the cardiac and intestinal regions, with trans- 

 verse* and oblique striae; sides arched in their anterior half, strongly 

 convergent posteriorly, armed with a strong tooth behind the larger 

 orbital tooth. 



Front half, or nearly half, as wide as the carapace, surface granu- 

 late; a small but pronounced lobe at the outer corners, the interven- 

 ing margin convex or slightly sinuous and crenulate. 



Orbits oblique, their major diameter less than one-third the width 

 of the front, lower border denticulate. 



Chelipeds normally subequal, much heavier than the legs, and 

 about one and two-thirds times as long as the carapace. Arm and 

 wrist finely striated, chela almost smooth. Inner margin of arm 

 limbed, distal end of limb dentate. A subacute tooth at inner angle 

 of wrist. Hand about one and one-half times as high as its superior 

 length; upper border margined, adjacent inner surface obliquely 

 striated, lower part of outer surface traversed by an obliquely longi- 

 tudinal raised line which runs from the end of the thumb toward 'the 

 wrist. Fingers narrowly and irregularly gaping. Dactylus one and 

 three-fourths times as long as the upper margin of the palm. 



2. 3. 1. 4. represents the legs in order of length, the second pair 

 the longest and one and two-thirds times as long as the carapace. 

 Merus joints with a spine near the distal end of the anterior border, 

 and a few teeth near the same end of the posterior border of all save 

 the last pair. 



Terminal segment of male abdomen triangular. 



Color. Dark crimson spotted with ecru. 



Habits. A very common species on rocky shores. 



Measurements. Male (17455), length of carapace 39, width of 

 same 46 mm. 



Range. From Oregon to Gulf of California ; Galapagos Islands ; 

 Chile; also Japan and Korea. 



Material examined. 



Crescent City Bay, California : lat, 41 42' N.: 2 males (5328). 



Monterey Bay, California: Albatross; 1 male, 1 female (15602). 

 Under submerged rocks along shore; Harold Heath; 1 male (22879). 

 Pacific Grove; Stanford Univ.; 2 males, 1 female (19076). Pacific 

 Grove; June, 1905; J. E. Benedict; 56 specimens (32234). 



San Simeon Bay, California; Apr. 4, 1890; Albatross; 1 male, 2 

 females (17456). 



Santa Barbara, California; Yarrow, Henshaw and Shoemaker; 9 

 males, 7 females, 3 y. (2324). 



