134 CALIFORNIA ACADEMY OF SCIENCES. 



Subgenus Eupagurus. 



Pagurus "with the large surface of the left hand horizontal. Species 

 not inclined to be hairy." 



Typical species, P. Bernhardus (Linn.). 



P. aleuticus, alaskensis and ochotensis belong here. All 

 are large species with the upper surface of the left hand 

 triangular and the edges prominent. 



Subgenus Trigonocheirus. 



Pagurus "with the outer face of the left hand oblique and more or 

 less triangular. In some cases it is flattened, in others concave, or very 

 much swollen as in hirsutiusculus . The species are frequently very hairy." 



Typical species P. trigonocheirus Stimpson. 



This group includes the greater number of the spe- 

 cies here described, viz., trigonocheirus, capillatus, Dalli, 

 Brandti, Rathbuni, Tanneri, confragosus, Newconibei, 

 Kennerlyi, hirsutiusculus, Samuelis, miiniraus, granosi- 

 manus, and Hemphillii. 



In many of the species the left hand is small and 

 rounded, presenting no distinctly outlined upper face. 

 In others the left hand is trigonous, with a well-defined, 

 triangular face bounded by prominent edges. The first 

 five species mentioned are very closely allied. In all 

 three the chelipeds are very unequal, the carpus of the 

 larger one oblong with the sides flattened and the upper 

 surface furnished with short spines or spiny granules; 

 the hand is oblong, evenly convex above, and armed 

 like the carpus; the smaller hand has a prominent, 

 triangular supero-external face. Rathbuni can be dis- 

 tinguished by the peculiar round pubescent patch on 

 the upper side of the carpus. Tanneri and confragosus 

 are distinguished from all the others by the ridge on 

 the upper surface of the larger hand. Newcombei can be 



