234 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM 



regions. Rostrum horizontal. Supraocular eave a little arched, 

 margin oblique. Two supraorbital notches, a broad suborbital sinus 

 and a narrower one next to the basal antenna! article. This article 

 as well as the lower orbit has denticulate margins. 

 Chelipeds not more than one and one-half times as long as the 

 carapace except in the old, twice as long; 

 margins of merus rough with sharp granules 

 or denticles; carpus and manus with lines of the 

 same; manus swollen, prismatic; fingers half 

 again as long as palm, deflexed, grooved, 

 smooth except for the denticulate prehensile 

 edges. First three ambulatory legs very long 

 (about twice as long as carapace, in the old 

 three times as long), flat; merus joints ver}^ 

 rough except near the middle of the surfaces. 

 Last leg much shorter (about as long as 

 cheliped) and narrower, merus smoother. 

 First two or three segments of abdomen 

 FiG.88.— chionoecetesopiuo coarsely granulate; terminal segment in male 



(43803), MAXILLIPED, X 3.7 . • r' 1 ■ • . 1 u. 



mvagmated m sixth segment. 



Color. — Light brick-red above, often iridescent, below yellowish- 

 white; sides of feet shining white (Stimpson). 



Measurements. — Male (9231), length of carapace and rostrum 

 (approxunately) 125.5, width 127.5, length of cheliped 234, of first 



Fig. 89.— Chionoecetes opilio, young male, dorsal view, enlarged. (After Smith, ms.) 



ambulatory leg 299 mm. Male (46636, opilio elongahis) , total length 

 of carapace 118, width 122.5 mm. 



i?an^^.— From west Greenland, in lat. 70° 42' N. (Hansen), 

 southward to Casco Bay, Maine, in fish stomachs (Smith). From 

 Arctic Alaska, 10 miles west of Point Franklin, westward to northeast 

 Siberia (long. 173° 24' W.) (Stuxberg), and southward through 



