140 CALIFORNIA ACADEMY OF SCIENCES. 



Brandti and Balli are found together in a depth of from 

 15 to 85 fathoms in the Aleutian Island region. They 

 grow to a length of three inches. They are separated at 

 sight by a sharply defined band of white on the distal 

 end of the merus joints of Balli, which is entirely want- 

 ing in Brandti. ^^ 



Pagurus Rathbuni (Benedict). 



Eupagurus Rathhuni Benedict, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 14. 



Near trigonocheirus, but with the median projection of the front acute 

 and projecting considerably beyond the lateral teeth. Eye-peduncles 

 stout, not two-thirds as long as the anterior portion of the carapace. Eye- 

 scales ovate, concave above, with a subterminal spine. Chelipeds resem- 

 bling those of trigonocheirus; the hand of the larger one over twice as long 

 as wide. Hand of the smaller cheliped much narrower than in trigono- 

 cheirus, the edges not nearly so prominent; fingers curved downwards. 

 Ambulatory legs spinulous above; dactyls twisted, longer than the pro- 

 podi, and nearly devoid of spinules with the exception of a few on the 

 lower side near the tip. 



Alaska. 



This species is distinguished from all the other hermit 

 crabs of the coast by the possession of a circular patch 

 of fine hairs on the antero-internal angle of the upper 

 surface of the carpus of the large cheliped. It is also 

 distinguished from the four preceding species by its 

 larger median frontal prominence. * 



Pagurus Tanneri (Benedict). 



Eupagurus Tanneri Benedict, Proc. U. S. Nat. Mus,, Vol. XV, 1892, p. 10. 



Anterior portion of the carapace as wide as long. Median frontal tooth 

 triangular, much larger and projecting much further forward than the 

 lateral teeth, which are broadly triangular, subacute, and furnished with 

 a terminal spine. Ocular peduncles stout; corneas dilated; scales ovate 

 and furnished with a subterminal spine which is visible from above, the 

 upper surface more or less concave. The outer spine of the second basal 

 antenna! joint reaches to, or beyond the middle of the fourth joint; acicle 



