82 RATHBUN 



shorter than the uropods and is armed with three pairs of lateral 

 spinules. 



Male.— The thickened portion of the outer antennular flagellum reaches 

 to the end or a little beyond the end of the antennal scale. 



Dimensions.— $ , approximate length 6i mm., length of carapace and 

 rostrum 22 mm., of rostrum 12.5 mm. 



Distribution. — Yxoxci the Aleutian Islands to Washington. Taken by 

 the Albatross at the following stations : 

 Unimak Pass, 34 fathoms, station 3220. 

 Northeast of Amak Island, 19 fathoms, station 3274. 

 Northeast of Cape Leontovich, 22 fathoms, station 3275. 

 North of Bird Island, Shumagins, 21 fathoms, station 2850. 

 Off Cape Flattery, Washington, 40 fathoms, station 2873. 

 Strait of Fuca, 48 fathoms, stations 2864, 3465. 

 Admiralty Inlet, Puget Sound, 40 fathoms, station 2865 (type locality). 



A single specimen was taken by Dr. Dall at Port Levashef, Unalaska, 

 and another at Granite Cove, Port Althorp, Chichagof Island. 



Variations. — Three teeth on the dorsal carina is the rule in this 

 species ; in more than two hundred specimens handled, there was one in 

 which the anterior of the three teeth was absent, another in which the 

 posterior tooth was absent, and two cases in which there were 4 teeth 

 instead of 3. 



Distinguished from nearly related species by the fewer dorsal teeth 

 and by the groove on either side of the third segment of the abdomen. 



SPIRONTOCARIS BARBATA Rathbun. 



Spirontocaris barbata Rathbun, The Fur Seals and Fur-Seal Islands of the 

 North Pacific Ocean, iii, 556, 1899. 



Anterior two thirds of carapace carinated. Rostrum from one third 

 to one fourth longer than the carapace, and also a little longer than the 

 antennal scale ; nearly straight and horizontal ; upper limb very narrow, 

 widening a trifle in front of eye, then diminishing to the tip, and armed 

 with 5 to 7 spines, one of which is on the carapace; anterior tooth at 

 about anterior third of rostrum; lower limb broader, gradually dimin- 

 ishing forward from a point in front of the eye, armed with about 10 to 

 20 teeth and denticles, of which the posterior three or four are of fair 

 size, the remainder very small and decreasing toward the tip, where they 

 are almost indistinguishable; tip acute. Antennal and pterygostomian 

 spines well and equally developed, the latter unusually high in position. 



Antennular peduncle reaching two fifths the length of the antennal 

 scale ; outer basal spine reaching to about the end of the first segment ; 

 second segment one and a half times as long as third ; outer flagellum 



