g 2 CRUSTACEA MALACOSTRACA. 



that I have examined the gills in many of my specimens and found them agreeing with the formula 

 given by Smith (1. c., p. 86). 



78, Sergestes arcticus Kroyer. 



1856. Sergestes arcticus Kroyer, Overs. Kgl. Danske Vid. Selsk. Forh. i 1855, p. 27. 

 ! 1859. — Kroyer, Kgl. Danske Vid. Selsk. Skrifter, 5. R., Naturv. og mathem. Afd., B. 4, 



1859, p. 240; Tab. Ill, Fig. 7 a — g, Tab. V, Fig. 16. 

 1875. Meyeri Metzger, Jahresber. Comrn. zur wiss. Untersuch. der Deutschen Meere in Kiel fiir 



die Jahre 1872, 1873, p. 302, Tab. VI, Fig. 7. 

 1882. arcticus S. I. Smith, Bull. Mus. Comp. Zool., Vol. X, No. 1, p. 96, PI. XVI, fig. 4. 



: 886. — — S. I. Smith, Rep. Comm. Fish and Fisher, f. 1885, p. 696, PL XX, figs. 1, 2. 



1888. — magnificus Chun, Bibliotheca Zool., B. 1, p. 33, Taf. IV, Fig. 4 & 5. 



! 1897. arcticus H. J. Hansen, Proc. Zool. Soc, London f. 1896, p. 949, 954 — 56. 



1903. — H. J. Hansen, Proc. Zool. Soc. Lond. f. 1903, p. 60, PL XII, figs. 1 a— 1 c. 



Occurrence. The "Ingolf" has taken this species four times. 

 West of Iceland: St. 12: 64 38' N. L,., 32 37' W. L., 1040 fm., temp. 0-3°; 2 spec. 



_ - - - 9:64° 18' 27 00' - 295 - - 5-8°; 3 - 



South- — - 67: 6i°3o' — 22 30' — 975 — — 3'o°; 1 — 



North of the Fseroes: St. 140: 63 29' N. L,., 6°57'W. L., 780 fm., temp. -=-0-9°; 1 spec. 

 Kroyer's original specimen was taken at West Greenland at "6o° odd N. L,.", from which it 

 may be concluded that it was taken in the Davis Straits. In 1903 and especially in 1904 the "Thor" has 

 frequently taken this species, at 15 stations in all, in at least almost all cases with the young-fish 

 trawl fai above the bottom. A short account of these catches may be given here. To the west of 

 Iceland it was taken at 65° 20' N. L., 27° i2 I /V W. L., young-fish trawl, 870 meters wire out, and at 

 65° 00' N. Iv., 28 10' W. L., 1000 meters wire out. South of Iceland it was taken a number of times at 

 places between 22°23'W. L. and i7°o8'W. L., the latitude varying between 63 15' and 6i I / 2 °; the 

 length of wire out was in two cases only 100 meters, in other cases 750 — 800 and 1800 meters. Two 

 of the "Thor's" stations lie north of the Fseroes (length of wire out, 1200 and 1500 meters), two of 

 them were south-west of these islands (wire out in the one case, 820 meters). 



Distribution. The species is noted from two places in the Irmiuger Sea at 6o c N. L,., to the 

 south-west and west of West Iceland, likewise from two places west of the Orkney Isles, being taken 

 all four times in a vertical net (Ortmami). On the west coast of Norway it goes north at least as far 

 as Trondhjem Fjord (G. O. Sars). Further, it is common off; the east coast of America between 41 35' N. L. 

 and 33 42' N. L. in depths from 139 to 2516 fm. It is known from the western half of the Mediter- 

 ranean; in the Atlantic it goes south to Montevideo and to 38 5' S. B., 12 E. L. (Hansen), lastly 3 of 

 the specimens taken by the "Challenger" south of Australia, at 47° 25' S. L., 130 22' E. L., 2150 fm., 

 belong to this species (Hansen). 



At a number of the "Thor's" stations, namely, where 800 meters wire at least were used and 

 where consequently the young-fish trawl was in a depth of at least 150—200 fm., specimens were 

 taken which were adult or of considerable size; the largest was taken where 1500 to 1800 meters wire 



