556 THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Pagurus rathbuni Benedict. 47 to 65 fathoms ; U. S. Fish Commission. 

 Pagurus splendescens Owen. 41 to 62 fathoms ; U. S. Fish Commission. 

 Pagurus trigonocheirus (Stimpson). 26 to 57 fathoms; U. S. Fish Commission. 



Pagurus undosus Benedict. 20 fathoms; IT. S. Fish Commission. St. Paul Island; Palmer and Elliott. 

 Crangon communis, sp. nov. 40 to 121 fathoms ; taken at 31 stations by the IT. S. Fish Commission 

 steamer Albatross. 



Allied to C. crangon (L.). The most noticeable differences are as follows: Two 

 median spines on the carapace, considerably in front of the middle; rostrum longer, 

 more slender and spatnlate; eyes larger; first to fifth abdominal segments each with a 

 transverse posterior smooth flattened crest; third to fifth segments with a similar 

 median longitudinal crest; sixth segment with two prominent blunt longitudinal keels. 



Dimensions of female. — Length of carapace from tip of rostrum, 16 mm.; width, 

 11 mm.; length of body from tip of rostrum to tip of telson, (14 mm. 



Type locality.— Lat. 57° 4' 20" N., long. 170° 52' 30" W.; 51 fathoms, station 3441 



Types.— V. S. Fat. Mus., No. 2282G. 



This species is one of the most abundant shrimps in Bering Sea. It can not be 

 confused with C. intermedia Stimpson, in wliich the posterior of the median spines is 

 at the middle of the carapace, and in which the first two abdominal segments have a 

 median carina. 



Crangon Intermedia Stimpson. 32 to 34 fathoms; at 3 stations of the Albatross. 

 Sclerocrangon sharpi Ortmann. .54 fathoms; Albatross. 

 Nectocrangon lar (Owen). 33 to 368 fathoms; 36 stations of the Albatross. 

 Nectocrangon crassa, sp. nov. 17 to 31 fathoms; at 6 stations of the Albatross. 



Allied to K. alasJcensis Kingsley in having three spines on the median line of the 

 carapace and a smaller spine or spinule Just behind the rostrum. The carapace differs 

 from that of N. alaslcensis in being shorter and broader. All the abdominal segments 

 are sculptured and keeled; the first to fifth have a blunt median keel, very short and 

 hump-like in the first and second segments; the first three segments have transverse 

 sulci; the keel of the fifth segment disappears toward the posterior margin; the sixth 

 segment is much shorter than in N. alasJcensis ; its double keel is not continued to 

 the posterior margin, and this margin is devoid of the sharp spines present in N. 

 alaslcensis. 



Dimensions of female. — Length of carapace, 13 Tum. ; width, 10.5 mm.; length of 

 body from tip of rostrum to tip of telson, 4S.5 mm. 



Type locality.— hut. 57° 4' N., long. 170° 24' W, ; 2(5 fiithoms, station 3557. 



Types.— U. S. Nat. Mus., No. 22827. 



Spirontocaris spinus (Sowcrby). 41 to 121 fathoms; at 13 stations of the Albatross. 

 Spirontocaris gaimardii (Milne-Edwards). 20 to 368 fathoms; at 17 stations. 

 Spirontocaris gibba (Kriiyer). 50 to 52 fathoms; at 2 stations. 



Spirontocaris barbata, sp. nov. 



Carapace with two spines on the anterior margin, one below the eye, the other 

 at the middle of the antenna. Dorsal carina extending to the posterior third of 

 the carapace. Itostrum about one-third longer than the carapace; uj^per margin 

 straight, armed with five teeth, one of which is on the carapace proper; distal two- 

 fifths of upper margin unarmed; extremity acute; lower lind) of slight deptli and 

 tapering from near the base to the tip, armed with about nine small teeth and 

 denticles, diminishing in size and distance apart, toward the ti]) of the rostrum. 



