DECAPODS 107 



the last pair may extend beyond the antennal scale by the length of the 

 dactylus and two thirds of the propodus. 



The first four segments of the abdomen are unarmed ; the third pro- 

 duced moderately backward in the middle; fifth with a spine at the 

 infero-posterior angles; sixth with a spine at the infero-posterior and 

 supero-posterior angles ; sixth nearly twice as long as fifth ; telson about 

 as long as sixth segment, with 5 or 6 pairs of lateral spinules ; extremity 

 with a pair of long median spines, a longer pair of submedian spines, and 

 a pair of short outer spines. 



Male. — The males exhibit the usual differences from the females in 

 being more slender, in the longer antennular flagella, and in the abdominal 

 appendages. 



Dimensions. — Female, length 62.6 mm., length of carapace and 

 rostrum 24 mm., of rostrum 1 1 mm. 



Distribution. — From the north coast of Unalaska eastward and south- 



ward to Point Sur, California, 178 to 636 fathoms. Taken by the 



Albatross at the following stations : 



North of Unalaska, 399 and 350 fathoms, stations 3329, 3331. 



Off Davidson Bank, 280 fathoms, station 3337. 



South of Sannak Islands, 483 fathoms, station 3210. 



Clarence Strait, 322 fathoms, station 3077. 



Off Queen Charlotte Sound, British Columbia, 204 fathoms, station 



2861. 

 Off Tahwhit Head, Washington, 178 fathoms, station 3076 (type locality). 

 Off Destruction Island, Washington, 516 fathoms, station 3343. 

 Off Sea Lion Rock, Washington, 636 and 477 fathoms, stations 3070, 



3073- 

 Off Cascade Head, Oregon, 345 fathoms, station 3347. 



Off Heceta Bank, Oregon, 277 fathoms, station 2890. 



Off Point Arena, California, 455 and 239 fathoms, stations 3348, 3349. 



South of Farallone Islands, California, 391 and 217 fathoms, stations 



3104,3105. 

 Off Pigeon Point, 296 fathoms, station 31 12. 

 Off Monterey Bay, 418-581 fathoms, stations 3126, 3127, 3670. 

 Monterey Bay, 278 fathoms, station 3669. 

 Off Point Sur, 298 fathoms, station 3187. 



Affinities. — Resembles the preceding species, S. macilenta, but differs 

 notably in the much larger and more reniform eyes, the longer rostrum, 

 of which the upper limb is narrowed at its base and the lower limb is 

 less deep, in the larger dorsal spines and the shorter scale. From S. 

 bispinosa at once distinguished by the absence of a supraorbital spine, 

 of the long, slender process of the rostrum and of the spine at the middle 

 of the carapace. The sixth segment of the abdomen is longer and more 

 slender than in S. bispinosa. 



