EXPEDITION TO POINT BARROW, ALASKA. 



149 



36. DULICHIA ARCTICA Murdoch. 

 (Plaloll.lig.3.) 



Year. 



1881 



Name. 

 Duliehia arctica, Miin)m-li 



Citation*. 



Proc.U.S.Nat.Mns., vii, 



DESCRIPTION. Head slightly produced, forming an obtuse angle. First epimeron produced 

 into a sharp spine projecting forward, the rest unarmed. Body smooth. Basa of second gnatho- 

 pods dilated and armed with two teeth; hand large, snbtriangidar, and armed on the edge with 

 two long, stout teeth. Last three pairs of pereiopods not specially long; third joint as long as the 

 fourth and fifth together. Second pair of saltatory feet with outer raiuus nearly twice as long an 

 the peduncle; inner a little longer. Eyes small, round, and black. Color grayish. 



Dredged in rather small numbers off the station in 5 fathoms on a muddy bottom. 



Museum numbers, 7890, 7900. 



PHYLLOPODA. 



37. LEPIDURUS GLACIALIS (Kr.) Baird. 



Tear. 



1847 



1852 



1678 



Name. 



Citations. 



Apus nlacifilif, Kro'yer i Nat. Tids.. ii R.. ii, p. 431 ; Voy., pi. 40, fig. 1. 



Lepidurue glacialii' VzirA ' Monograph of the family Apodidn-. Proo. Zoo. Soc. Lond., pt. , 



p. 0; Anmilosa, pi. xxii, fig. 2. 



Ltpiiuria glatiaiit, Packard Phyllopods of N.America. Report of U. S. Geological and Geo- 

 graphic..] Survey of the Territories, pt.i,p.310. 



This species has been kindly identified by Dr. A. S. Packard, jr., of Brown University, who 

 examined our specimens and compared them with a specimen from Greenland. 



It was abundant on the pools on the tundra, where it lurked in the mud and alga-, but 

 appeared slightly capricious in its distribution, as it was not found in every pool. They lived until 

 the pools froze up in the autumn. 



They were especially abundant in the pool near the station from which we obtained our drink- 

 ing water. In 1882 they were observed for the first time on July 8, but the next year they were 

 ten, days later in appearing, and seemed scarce and sluggish. 



The species has been obtained in Greenland and also near Cape Kruserfstern, Alaska. 



38. BRANCHINECTA PALUDOSA (Mull.) Verrill. 



This species was very abundant in the fresh-water pools all over the tundra, lirst appearing 

 about the middle of .lune in the small pools made by the melting snow along the edge of the tun- 

 dra at- the crown of the beach. 



