136 RATHBUN 



ing in two spines. Two other spines are placed at the posterior margin 

 of this segment, one on each side. Fifth segment furnished with a sharp 

 spine on the posterior margin near the median line ; also a small spine 

 on the lateral surface. Lateral faces of the first five segments sculptured 

 by two irregular transverse furrows, sixth segment laterally with an 

 indistinct longitudinal ridge. Pleura of first to fourth segments tri- 

 angular, inferior angles blunt, without spines. Sternal crest low, dentate, 

 terminating anteriorly in a spine. 



Dimensions. Female, length 36.7 mm., length of carapace 11.5 mm., 

 width of carapace between tips of antero-lateral spines 10.4 mm. 



Distribution. Bering Sea, Aleutian Islands, and Alaska Peninsula, 35- 

 150 fathoms. Taken by the Albatross at the following stations: 

 Off Pribilof Islands, 54 and 150 fathoms, stations 3552, 3486. 

 Pumicestone Bay, Unalaska, and vicinity, 35 and 59 fathoms, stations 



3322, 3319. 



Off North Head, Akutan Island, 56 and 72 fathoms, stations 2841, 2842. 

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

 Northwest of Unimak Island, 43 fathoms, station 3262. 

 Portlock Bank, 51 fathoms, station 2857. 



Marmot Isle, Kadiak, 45 fathoms (Sharp). 



Genus Nectocrangon Brandt. 



KEY TO THE SPECIES OF NECTOCRANGON. 



A. Carapace with only two median spines behind the anterior margin. 

 B. Carinae of sixth segment of abdomen not terminating in a small 



sharp tooth or spine lar. 



B'. Carinae ,of sixth segment terminating in a small sharp tooth or 



spine. 

 C. All the abdominal segments carinated. 



D. Eyes with low tubercle. Spines of carapace appressed ; those 

 on anterior margin short. Hand elongate, about five times 



as long as wide dentata. 



D'. Eyes with elongated sharp tubercle. Spines of carapace sub- 

 erect ; those on anterior margin long, slender. Hand 

 shorter, only three and a half to four times as long as wide 



ovifer. 

 C'. The first and second abdominal segments not carinated 



calif orniensis. 



A'. Carapace with three or four median spines behind the anterior mar- 

 gin. 

 B. Carinse of sixth segment of abdomen terminating posteriorly in a 



small spine alaskensis. 



B'. Carinae of sixth segment of abdomen not terminating posteriorly 



in a small spine. 



C. First to fourth segments of abdomen carinated . . . crassa. 

 C'. First to fourth segments of abdomen not carinated . . levior. 



