128 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



Genus AMBLYOPS G. O. Sars 

 Amllyops G. O. Sars, 1869, p. 328 ; 1872b, p. 3. 



AMBLYOPS ABBREVTATA (G. O. Sars) 



Figure 44 



Pseudomma abbreviatum G. O. Sars, in M. Sars, 1869, p. 262 {nomen nudum). 

 Amblyopsis abbreviata G. O. Sars, 1869, p. 328. 

 Amblyops abbreviata G. O. Sars, 1872b, p. 5, pi. 6. 



Occurrence. — East coast of United States : U. S. Fish Commission 

 locality 344, off Cape Cod, 130 fathoms, September 10, 1879, 1 male ; 

 Fish Hawk stations 952, latitude 39°55' N., longitude 70°28' W., 396 

 fathoms, August 23, 1881, 1 female ; 997, latitude 39°42' N., longitude 

 7l°32' W., 335 fathoms, September 8, 1881, 2 females; 998, latitude 

 39°43' N., longitude 71°32' W., 302 fathoms, September 8, 1881, 17 

 females, 10 males; 1029, latitude 39°57'6" N., longitude 69°16' W., 458 

 fathoms, September 14, 1881, 1 male; Albatross station 2046, 3 males, 

 2 females; 2192, 1 male. West coast of United States: Albatross 

 station 4753, 1 male, 1 female, 13 mm. Japan : Albatross stations 

 4781, 1 female, 17 mm. ; 4800, 1 male, 14 mm. 



Distribution. — The present series of records represent the first from 

 the American coasts and the first of the species from the Pacific Ocean. 

 Inasmuch as former collections were from the Irish and Norwegian 

 coasts of the North Atlantic, the present series provides a further 

 example of an Arctic-boreal species, which is circumpolar in distribu- 

 tion and has penetrated into the boreal area of both the Atlantic and 

 Pacific Oceans. 



Remarks. — The last three records listed above are from stations in 

 the Pacific Ocean. The specimens from these stations agree with the 

 typical form in the proportions of the body, the antennal scale, and 

 the telson. The antennal scale (fig. 44, d) even has the accessory spine 

 at the inner base of the terminal spine of the outer border. The telson 

 (fig. 44, e) has a slightly greater number of spines on the lateral mar- 

 gins, 28 to 32 as against about 25 in the typical form, but this small 

 difference is well within the limits of individual variation. They 

 differ in that the process on the anterior median border of the eye is 

 longer and more acute in lateral view (fig. 44, b) especially in the male 

 The anterior border of the ocular plate is also microscopically spinulose 

 especially at the outer corner (fig. 44, a-b), but examination of At- 

 lantic specimens reveals the fact that they also are microscopically 

 spinulose, though the spinules are very much smaller and finer than 

 in the Pacific specimens. I give figures (fig. 44, a-f) of the Pacific 

 specimens to illustrate these small differences. I do not consider the 



