NO. I POINT BARROW AMPHIPODA — SHOEMAKER 29 



Gnathopod i rather short and stout; second joint as long as the 

 fifth and sixth combined; fifth joint about two-thirds as long as the 

 sixth and a little wider; sixth joint about twice as long as wide and 

 tapering distally, hind margin with a few slender spines ; seventh joint 

 over half the length of the sixth, inner margin bearing a row of very 

 fine teeth and a larger distal tooth. Gnathopod 2, second joint as long 

 as the fifth and sixth combined ; fifth joint half the length of the 

 sixth and produced below into a narrow lobe; sixth joint oval, palm 

 oblique, shorter than the hind margin of the joint and defined by a 

 spine, below which on the inner surface is another spine. Peraeopod 4 

 a little longer than 5, second joint not greatly expanded, twice as long 

 as wide, with a rather shallow distal lobe; fourth joint expanded, 

 with lower distal lobe reaching the end of the fifth joint; seventh 

 joint stout and a little over half the length of the sixth. Peraeopod 5 

 much like 4, but the second joint is shorter and broader. Telson 

 reaching a little beyond the end of the peduncle of uropod 3, about 

 two-thirds as wide as long, without marginal spines, and with sides 

 converging to a narrow rounding apex. Length 3 mm. 



Type. — A female, U.S.N.M. No. 95192, taken 5 miles off Point 

 Barrow, Alaska, in 184 feet of water, August 30, 1949, by George E. 

 MacGinitie. 



PROBOLOIDES NORDMANNI (Stephensen) 



Figure 10, a-k 



Metopa nordmanni Stephensen, 1931, p. 187, fig. 55. — Gurjanova, 1935a, p. 73. 



Material collected. — In 150 feet, August 23, 1948, i specimen. In 

 80 to 125 feet, September 8 to 15, 1948, 3 specimens. In 125 feet, 

 4 to 5 miles out, September 9, 1948, i specimen. In 184 feet, 5 miles 

 out, August 30, 1949, 3 specimens. In 217 feet, 7.5 miles out, Sep- 

 tember 6, 1949, 2 specimens. B51-23, near Point Barrow, dredged 

 in 6 to 50 m., July 29, 1951, i specimen. 



Stephensen described this species from a single female that was 

 taken in northern Stromfjord, which is on the lower part of the 

 west coast of Greenland. His specimen measured about 5 mm., while 

 the specimens from Alaska are about 4 mm. A male has been figured 

 here, the proportions of the appendages of which vary somewhat 

 from those of the female. The mouthparts of the original female 

 were not dissected out, but the specimens from Alaska have a 2-jointed 

 palp to the first maxilla and a 3- jointed palp to the mandible, which 

 place the species in the genus Proholoides. In the male the antennae 

 are longer. Gnathopod i in the male is proportionately shorter, the 

 fourth joint not equaling half the length of the fifth, whereas in the 



