DECAPODS 65 



while in S. spina it is more than one and a half times as long as wide ; 

 the maxillipeds reach to the tip of the antennal scale ; the dactyli of the 

 third to fifth pairs of feet are shorter than in S. spina, that of the last 

 pair being contained at least three times in the propodus, while in S. spina 

 the dactylus of the last pair is contained only two and a half times in its 

 propodus. 



The males of this species and of S. spina are more difficult of deter- 

 mination. The rostrum has the midrib more strongly curved upward, the 

 upper limb deeper and with more convex superior outline than in S. spina. 

 The same differences in the abdomen exist as in the females of the two 

 species, but in a lesser degree. 



Dimensions. ? , length 53.8 mm., length of carapace and rostrum 20 

 mm., of rostrum 8 mm. 



Distribution. From Pribilof Islands to Strait of Fuca; 3-350 fathoms. 

 A more southerly range than that of S. spina. 



Harriman Expedition. Kadiak, 5 fathoms (W. R. Coe) ; Berg Bay, 

 Glacier Bay ; Juneau, 20 fathoms. 



Collected by the Albatross : 



Off Pribilof Islands, 48-150 fathoms, stations 3484, 3486, 3500, 3561, 



3602. 



Off Cape Menshikof, 24 fathoms, station 3296. 

 Off Cape Strogonof, 26 fathoms, station 3291. 

 Northeast of Unimak Island, 24 fathoms, station 3266. 

 Northwest of Unimak Island, 43 fathoms, station 3262. 

 Unimak Pass, 34 fathoms, station 3220. 

 Off North Head, Akutan Island, 72 fathoms, station 2842. 

 Off south entrance to Akutan Pass, 45 fathoms, station 2843. 

 Off Aektok Island, 54 fathoms, station 2844. 

 Davidson Bank, 42 fathoms, station 2845. 

 North of Unalaska, 350 fathoms, station 3331. 

 Iliuliuk Harbor, 93 fathoms, station 3335. 

 Off Makushin Bay, Unalaska, 61 fathoms, station 3318. 

 Southwest of Sannak Islands, 41 fathoms, station 3213. 

 15 miles south of Sannak Islands, 44 fathoms, station 2846. 

 Off Shumagin Bank, 138 fathoms, station 3339. 

 Off Falmouth Harbor, Shumagins, 48 fathoms, station 2847. 

 Shumagins, 21-58 fathoms, stations 2850-2852. 

 Off Trinity Islands, 159 fathoms, station 2853. 

 Admiralty Inlet, Puget Sound, 40 fathoms, station 2865. 

 Washington Sound, Strait of Fuca, 48 fathoms, station 2864 (type 



locality). 

 Strait of Fuca, 40-152 fathoms, stations 3443-3446, 3451, 3454? 345 5> 



345 8 > 3459> 346i, 34^2, 3464, 3465, 3596. 



Dr. W. H. Dall has collected the species at 16 localities along the 

 Aleutian Islands and eastward to Port Etches in 3-80 fathoms. 



