NO. I POINT BARROW AMPHIPODA — SHOEMAKER 35 



Family ACANTHONOTOZOMATIDAE 



ACANTHONOTOZOMA SERRATUM (Fabricius) 



Acanthonotozoma serratus Sars, 1893, p. 374, pi. 131, fig. i. — Stebbing, 1906, p. 

 318. — Stephensen, 1938, p. 186. 



Material collected. — In 125 feet, September 9, 1948, 2 specimens. 

 In 216 feet, October 6, 1949, i specimen. In 175 feet, October 14, 

 1949, 16 specimens. 



Acanthonotozoma serratum has been taken at Spitzbergen; Kara 

 Sea; Nova Zembla; Norway; Skagerrak; Iceland; East and West 

 Greenland; Baffin Bay; Port Burwell, Ungava; Labrador; Bay of 

 Fundy ; Mount Desert Island, Maine ; and off Cape Ann, Mass. It is 

 now for the first time recorded from Alaska. 



This species is quite variable. Sars figures the second joint of the 

 last three peraeopods with the lower posterior angle acutely produced. 

 Specimens from the east coast of North America have this lower 

 posterior angle quadrate and bluntly rounding. The specimens from 

 Point Barrow also do not have this angle produced but more or less 

 quadrate and bluntly rounding. 



Cape Ann is the most southern record for this species, which 

 reaches a length of 12 mm., and has been recorded as low as 753 m. 



ACANTHONOTOZOMA INFLATUM (Kroyer) 



Vertumnus in flatus Goes, 1866, p. 523, pi. 38, fig. 11. 



Acanthonotozoma inflatum Stebbing, 1894, P- 32, fig. 6; 1906, p. 219. — Stephen- 

 sen, 1931, p. 211; 1938, p. 188, fig. 22; 1944b, p. 61. 



Material collected. — In 150 feet, August 23, 1948, 5 specimens. In 

 420 feet, 7 miles out, August 9, 1949, 2 specimens. In 213 feet, 

 4 miles out, October 6, 1949, i specimen. In 216 feet, 4^ miles out, 

 October 6, 1949, i specimen. In 152 feet, 3.5 miles out, October 14, 

 1949, I specimen. In 175 feet, 4 miles out, October 14, 1949, 20 

 specimens. 



Acanthonotozoma inflatum, as with the preceding species, is quite 

 variable in some of its characters. Stebbing's figure (1894, fig. 6) 

 shows the lower posterior angle of the second joint of the last three 

 peraeopods sharply produced. Goes's figure (1866, pi. 38, fig. 11) 

 shows the second joint with an evenly rounding lower posterior 

 margin. The specimens of this species from the east coast of America 

 have the lower posterior corner of the second joint about quadrate 

 and narrowly rounding. The specimens taken at Point Barrow re- 

 semble Goes's figure, but have the lower posterior border of the 

 second joint broadly rounding without any angle whatever. 



