42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



low, backward-pointing ridges at the lower end of the segments just 

 above the coxal plates. 



The waters around Alaska and Bering Sea are inhabited by an 

 assortment of forms which appear to be varieties of the typical 

 panopla. E. Gurjanova (1938, p. 313, fig. 28) has figured and de- 

 scribed one of these varieties, which she has named variety ohtusiros- 

 tris. The animal she has figured is an extreme case, having the 

 rostrum decidedly truncate. This is a character which varies from 

 the extreme to almost no truncation at all. There are forms possessing 

 carinae and teeth in a number of different arrangements and com- 

 binations. A form has been here figured with an extreme assortment 

 of teeth, knobs, and ridges, which is being named Pleustes panopla, 

 var. angulata (fig. 14, b). 



Type. — U.S.N.M. No. 92422. This specimen, a female, measuring 

 about 10 mm., with fully developed marsupial plates, was taken by 

 the Fisheries steamer Albatross, at station 4804 (46° 42' N., 151° 

 47' E.) at 229 fathoms, June 24, 1906. Gurjanova (1938, p. 313, 

 fig. 27) has figured a variety which is much like the one here figured ; 

 however, she identified it as Pleustes cataphractus Stimpson. It is 

 difficult to decide where varieties end and species begin in such cases 

 as these. 



Pleustes panopla reaches a length of 27 mm. and occurs from the 

 littoral down to about 1026 m. 



PLEUSTES MEDIA (Goes) 



Paramphithoe media Goes, 1866, p. 523, pi. 38, fig. 13. — Boeck, 187 i, p. 176. 



Pleustes medius Boeck, 1876, p. 302. — Stebbing, 1906, p. 311. — Shoemaker, 

 1930b, p. 307, fig. 38. — Gurjanova, 1935a, p. 76. — Frost, 1936, p. 6. — Stephen- 

 sen, 1938, p. 250. fig. 27. 



Material collected. — In 420 feet, 7 miles out, August 9, 1949, 3 

 specimens. In 217 feet, 7.5 miles out, September 6, 1949, i specimen. 

 In 295 feet, 5 miles out, October 6, 1949, i specimen. 



Pleustes media was described from Spitzbergen in 1866. It was 

 next recorded from the White Sea by Jarzynsky in 1870. In 1930 a 

 single specimen was taken in the Gulf of St. Lawrence by the Cheti- 

 camp Expedition. In 1935 Gurjanova recorded it from the Kara Sea. 

 A single specimen was recorded from the Newfoundland waters by 

 Nancy Frost in 1936. 



Five specimens of this rarely seen amphipod were taken in the 

 offshore waters at Point Barrow in 1949. There are in the United 

 States National Museum two specimens of Pleustes media taken by 

 the Fisheries steamer Albatross in 1885, one at station 2461 (45° 4/ 



