PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 445 
lamellxe of the uropods are about as long as the sixth somite, oblong- 
elliptical, about four times as long as broad, and the terminal spine of 
the outer margin about a fourth of the way from the tip to the base. 
The inner lamella is a little shorter, and proportionally very slightly 
narrower. ‘The bases of the first pair of abdominal legs are connected 
_ by a very large and complex sexual appendage, nearly twice as long as 
the bases themselves. 
The only specimen seen is from station 878 (142 fathoms), and gives 
the following measurements : 
mm 
Length from tip-of rostrum to tip of telson.:.-...... 2.22.2 --...2-e25 1. ee 61.0 
Henetnor carapax and /restram.\. 2.0) widest wilek. ve acd peesidee -leintn ote « BOO 
Peete enOcney ty yori shtick - Bs te- stitmee sq seckieetnecianclas cewamecs Jose vamees «ERO 
OSE RIN: CH a CEES CES Ae en Sen Be] Se eee ys ee Be a ee ee 6.5 
este MEDIAL OMIM AD SCAG) Fo = be c/o aii, Goainis sisi ase eae sigh cis Scie sine peers sews 11.0 
MeO SIXih ADCOMINAL SOMILG: .. 222. 5.526 soccer o-nel-nee + se oeee eemeteee 10.6 
ae EMPERECH MU Per coerce ents Seine e he ok s citate Stews. co 2. ite cheat J ee 
Sergestes arcticus Kréyer, Oversigt danske Vidensk. Selsk. Forhandl. Kjébenhaven, 
1855, p. (6); Monograph. Sergestes, Vidensk. Selsk. Skr., v, naturvidensk. 
mathem. Afh., iv, pp. 240, 276, pl. 3, figs. 7, pl. 5, figs. 16, 1856. 
Stations 880, 881, 891, 893, 894; 252 to 500 fathoms; thirty speci- 
mens, most of them in good condition, and several about 60"" in length. 
Sergestes, sp. 
Station 893; 372 fathoms; three specimens, over 60°" in length. The 
species is different from any described by Kroyer. 
SCHIZOPODA. 
Thysanopoda Norvegica Sars. 
Stations 879, 880; 225 and 252 fathoms. 
Lophogaster, sp. 
Station 870; 155 fathoms. A species very distinct from L. typicus 
Sars. 
Boreomysis arctica G. O. Sars, Christianiafjordens Dybvandsfauna, p. 26, 1869 
(extr. Nyt Magazin for Naturvidenskberne); Christiania Videnskabs-Sels- 
kabs Forhandlinger, 1871, p. 264 (21).—Metzger, Jahresbericht der Comm. 
wissensch. Untersuchung der deutschen Meere fiir 1872, 1873, Nordsee, p. 
288, 1875.—Mysis arctica Kroyer, Et Bidrag til Kundskab om Krebsdyrfami- 
lien Mysidx, Naturhistorisk Tidsskrift, III, i, pp. 34, 42, pl. 1, fig. 5, 1861. 
Station 891; 500 fathoms. 
Pseudomma roseum G. 0. Sars, Christiania Videnskabs-Selskabs Forhandlinger, 
1869, p. 154 (10); Carcinologiske Bidrag til Norges Fauna, Mysider, part i, p. 
54, pl. 4, 1870; Hardangerfjordens Fauna, Christiania Videnskabs-Selskabs 
Forhandlinger, 1871, p. 263 (20); Archiv for Mathematik og Naturvidenskab, 
Kristiania, ii, p. 344, 1877.—Metzger, Jahresbericht der Comm. zur wissensch. 
Untersuchung der deutschen Meere fiir 1872, 1878, Nordsee, p. 288, 1875.— 
Whiteaves, Report on further Deep-Sea Dredging Operations in the Gulf of 
St. Lawrence [in 1873], p. 16, [1874?].—Smith, Trans. Conn. Acad., v, p. 98, 
1879. 
Station 891; 500 fathoms. 
