PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 445 



lainelloe 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 

 b}^ 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. 



Lengtli from tip of rostrum to tip of telson 61. 



Length of carapax and rostrum 20,0 



Length of rostrum 5. 6 



Breadth of carapax 6. 5 



Length of antennal scale 11.0 



Length of sixth abdominal somite 10. 6 



Length of telson 8.2+ 



Sergestes arcticus Kroyer, Oversigt dansko Vidensk. Selsk. Forhandl. Kjobenhaven, 

 1855, p. (6); Monograph. Sergestes, Vidensk. Selsk. Skr., v, naturvidensk. 

 mathem. Af h., iv, pp. 240, 27G, pi. 3, figs. 7, pi. 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 CO""" 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. — Mijsis arctica Kroyer, Et Bidrag til Kundskab ocn Krebsdyrfami- 

 lien Mysidse, Naturhistorisk Tidsskrift, III, i, pp. 34, 42, pi. 1, fig. 5, 1861. 



Station 891 ; 500 fathoms. 



Pseudomma roseum G. O. Sars, Christiania Videnskabs-Selskabs Forhandlinger, 

 1869, p. 154 (10) ; Carcinologiske Bidrag til Norges Fauna, Mysider, part i, p. 

 54, pi. -4, 1870; Hardangerfjordens Fauna, Christiania Videnskabs-Selskabs 

 Forhandlinger, 1871, p. 263 (20); Archiv for Mathematik og Naturvidenskab, 

 Kristiania, ii, j). 344, 1877. — Metzger, Jahresbericht der Comm. zur wissensch. 

 Untersuchung der deutschen Meere fiir 1872, 1873, Nords?e, \}. 288, 1875. — 

 Whiteaves, Report on further Deep-Sea Dredging Operations in the GuK of 

 St. Lawrence [in 1873], p. 16, [1874?].— Smith, Trans. Conn. Acad., v, p. 98, 

 1879. 



Station 891; 500 fathoms. 



