1917 



Way; on Taxonomy of Crabs 



353 



hairs similar to those on the carapace. Male abdomen extending to at- 

 tachment of chelipeds, female as far as mouth parts; female abdomen 

 with a pair of pleopods near posterior margin. Maxillipeds long; propodi 

 with rounded lobes on outer margin; dactyls long, clavate; both these 

 segments have long tufts of silky hair from the outer margin; carpus 

 short; inner margin concave, outer convex, slightly hairy; ischium with' 

 a projection on inner surface; chelipeds unequal in size; merus of large 

 cheliped slightly hairy, 4 spines in front, 2 large ones in the middle, 

 and a smaller one on each side. Carpus and hand have rows of spines, 

 the large spines on the outer margin of the hand. Small hand with 4 

 spines on outer border and 3 on inner edge. Walking legs quite flattened, 

 covered with tufts of coarse hairs, without spines except on dorsal anterior 

 edge and at some of the joints; ventral sides of walking legs quite smooth; 

 dactyls small, black-tipped, sharp clawed, with a row of fine teeth on the 

 posterior margin. Color brownish-red or grayish brown, in either case the 

 legs are quite red on the ventral side. 



Found along rocky shores at extremely low tide under rocks. Eight 

 were found on the northeast corner of Brown Island (8) and an imma- 

 ture one on Turn Rock (12). 



PLATE 79 



Hemigrapsus nudus, used to illustrate some general parts of crabs ; 

 all drawings X 1 • 



I'ig. 1. Thoracic leg; c, carpus; d, dactyl; i, ischium; m, merus; p, pro- 

 podus. 



Tig. 2. Dorsal view of carapace; br, brancliial region; eg, cervical 

 groove; cr, cardiac region; /, front; g, gastric region; hr, hepatic 

 region; ir, intestinal region; po, postorbital tooth. 



Fig. 3. Cheliped; d, dactyl; pm, palm; px, pollex. 



