CRUSTACEA OF THE PRIRILOF ISLANDS. 557 



Inner antenmv about two-thirds length of rostrum. Scale of outer antennsie about 

 seven-eighths length of rostrum. Maxillipeds reaching a little over one-half length 

 of rostrum. 



Abdomen with the fourth, lifth, and posterior half of the third segment carinated, 

 the carina of each segment prolonged in a slender, sharp spine; carina of third segment 

 with a subterminal hump; posterolateral angle of lifth segment armed with a spine; 

 posterior margin of the sixth segment armed with a median and lateral spine, also a 

 spinule at the inferior angle. 



Dimensions of female. — Length of carapace, to orbit, 12 mm. ; length to tip of ros- 

 trum, 19.6 mm.; length of body from tip of rostrum to tij) of telson, 74.5 mm. 



Type locality.— hat. 56° 18' N., long. 169° 38' W.; 86 fathoms, station 3497. 



Type.— JJ. S. Nat. Mus., No. 22828. 



Spirontocaris camtschatica (Stimpson). 20 fathoms; at station 3438, Albatross. 

 Spirontocaris macilenta (Krijyer). 39 fathoms; station 3511. 

 Spirontocaris avina, sp. uov. 



Carapace with one anterior spine, below the eye; lower angle with a minute spinule. 

 Anterior half of carapace dorsally carinated; a small spine at the anterior fifth; in 

 front of this spine arises a thin arcuate crest which forms the chief part of the rostrum. 

 Eostrum short, extending beyond the carapace about one third of its length, but not 

 reaching the penult joint of the autenuular peduncle ; its lamellate crest, half of which 

 is above the carapace, is armed with about thirteen small crowded spines; extremity 

 beak-like, straight, slightly deflexed, acute, unarmed above, one or two teeth near the 

 end below. Antennulfe extending considerably beyond the antennal scale. Antennal 

 peduncle a little shorter than antennular peduncle; scale extending two-thirds its 

 length beyond the rostrum. Maxillipeds slightly longer than antennal scale. Legs 

 long and weak. 



Abdomen smooth, not carinate; third segment produced over the fourth, posterior 

 margin convex; posterior angle of fourth segment armed with a spinule; of fifth and 

 sixth with a spine. 



Dimensions of female. — Length of carapace, to orbit, 9 mm. ; length of rostrum 

 beyond posterior line of orbit, 3 mm.; length of body 35 mm. 



Type locality.— 'Sorth of Unalaska, lat. 54° 00' 45" N., long. 166° 53' 50" W.; 351 

 fathoms, station 3330. 



Types.— \J. S. Nat. Mus., No. 22829. 



Spirontocaris polaris (Sabine). St. Paul Island (Brandt) ; William Palmer, June 21, 1890. 

 Pandalus borealis KriJyer. 36 to 121 fathoms; very abundant; taken at 34 stations by the Albatross. 

 Pandalus montagui Leach. 25 to 121 fathoms; taken at 22 stations* less abundant than the last. 

 Pandalus dapifer Murdoch. 36 to 50 fathoms-; at 3 stations. 

 Rocinela belliceps (Stimpsou). St. Paul Island; F. W. True. 

 Arcturus beringanus Benedict. 32 fathoms ; U. S. Fish Commission. 

 Idotea ochotensis Brandt. Seal stomach. St. Paul Island; F.A.Lucas. 

 Synidotea biscuspida (Owen). 49 to 62 fathoms ; U. S. Fish Commission. 

 Synidotea nebulosa Benedict. 32 fathoms; U. S. Fish Commission. 

 Anonyx nugax (Phipps). Seal stomach. St. Paul Island; F.A.Lucas. 

 Amphipoda of family Lysianassidae. Seal stomach. St. Paul Island ; F. A. Lucas. 

 Branchipus sp. St. George Island; F.A.Lucas. 



