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University of California Publications in Zoology [Vol. 23 



Pachygrapsus crassipes Randall 



Plate 45 



Pachygrapsus crassipes Eandall, Jour. Acad. Nat. Sei. Phila., 8, 126, pi. 5, 

 fig. 4, 1839; deMan, Notes Leyden Mus., 12, 86, pi. 5, fig. 11, 1890; 

 Holmes, Oecas. Papers Calif. Acad. Sei., 7, 79, 1900; Rathbun, H. A. E., 

 10, 189, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 61, 

 pi. 13, fig. 41, 1910; Baker, Eept. Laguna Mar. Lab., 1, 102, 1912: 

 Rathbun, Bull. U. S. Nat. Mus., 97, 241, pi. 59, 1918. 



Fig. 159. Pachygrapsus crassipes (after deMan). 



Characters. — Carapace nearly square, moderately convex; lateral margins 

 strongly arcuate; entire upper surface except cardiac and intestinal regions trans- 

 versely striated; frontal (interorbital) margin practically straight in frontal 

 aspect ; sides with a single tooth behind the prominent postorbital. Outer 

 maxillipeds with merus quite strongly produced at antero-internal angle. Hand 

 of adult male larger than all the preceding joints combined, a raised line usually 

 present on the upper side of the palm and a delicate line on the lower 

 portion of the outer surface. Merus of last pair of ambulatory legs with postero- 

 distal angle entire. 



Dimensions. — Type, male: length of carapace about 40.6 mm., width between 

 43.2 and 45.7 mm. Carapace of Bay specimens ranged from 7 to 38 mm. in width, 

 the greater number measuring about 25 mm. across. 



Color. — General color in life a very dark red with a variable amount of 

 whitish color, which is sometimes almost entirely absent and again gives to the 

 whole a light shade. A line of the light color is usually present in front of each 

 of the striae of the carapace, and spots of it in the intestinal and cardiac regions. 

 The ambulatory legs are similar in color to the carapace, the chelipeds are gen- 

 erally tan colored, veined with red. The thin cuticle at the joints is a livid green 

 (Weymouth). 



Type Locality. — Sandwich Islands (doubtful). 



