122 

 LUOIFERID^. 



LUCIFER ACESTRA, Dana. 



Lucifer acesti-a, Dana, U. S. Expl. Esped. Crust., i, 671, pi. 44, f. 9. 



Locality : North Pacific Ocean. 



Male caught June 28, 1873, in latitude 30° north, longitude l46o 

 west; female, May 9, 1873, in latitude 40 north, longitude 127° west. 



After an examination of the genus Sergia there is no longer any 

 doubt in my mind, that the place for Lucifer is with the lower Macroura 

 rather than with the Schizopoda. The propriety of even elevating it to 

 the dignity of a separate family is questionable. 



I make the following addition to the characters already pointed out 

 as distinguishing the sexes of this species. In the females the extrem- 

 ity of the internal margin of .the outer caudal lamella projects beyond 

 the apex of the spine at the extremity of the external margin ; in the 

 male this margin is not produced at all, but is truncated. The trun- 

 cated surface is rounded, and slopes forward and inward from the base 

 of the spine. 



EUPHAUSID^. 



EUPHAUSIA GIBBOSA, n. sp. 



Carapace short rostrate ; rostrum broad, triangular, on a lower level 

 than the superior surface of the carapace ; the superior surface behind 

 the rostrum gibbous, elevated slightly above the rest of the surface. 

 Inner antennae three-jointed, about three times as long as the eye; the 

 first joint as long as the second and third together; its apex above pro- 

 duced into a long spine, which reaches half the length of the following 

 joint, and directed upward and somewhat forward ; the apex of second 

 joint also produced, but spine shorter and directed more forward; second 

 and third joints subequal; a tuft of long hairs at the apex of the last joint; 

 the flagellum long, and with antenna about as long as the body. The an- 

 tennary scale oblong, as long as the base of the antenna; the apex fur- 

 nished with long, curved cilia ; flagellum of the outer antenna about as 

 long as that of the inner pair. The feet slender; the last three joints 

 longer than the one nest preceding ; the penult and antepenult sub- 

 equal; the ultimate a little more than half the length of the penult; 

 the setoe long and plumulose ; the palpus about one-third the length of 

 the leg, those on the anterior legs longer. Branchise ramose. The 



