Planche 1 issued from : O. Tanaka in Publ. Sero Mar. Biol. Lab., 1960, VIII (1). [p.98, Fig.88].
Male (from Suruga Bay, Japan, from haul 0-1000 m): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment with P5 and urosome (lateral left side); d, rostrum (anterior aspect); e, Mx2; f, Mxp; g, P1; h, P2; i, endopod of P3; j, P4; k, distal joint of left P5.

Nota: Head and 1st thoracic segment fused, 4th and 5th separate (5th short and truncated in dorsal aspect).
Rostrum with a wide base to which 2 slender filaments attached.
The abdominal segments and caudal rami in the proportions 16 : 24 : 24 : 20 : 4 : 12 = 100.
Caudal rami parallel, longer than wide.
Mx1 with 7 long and 2 short setae on the outer lobe; 5 setae on the exopodite; 7 setae on the endopodite; 5 setae on the 2nd basal segment.
Mx2 has a denticulated spine on the 5th lobe, the distal segment of endopodite with long vermiform setae.
Mxp slender, 1st basal segment with 2 long vermiform filaments and a short bud-like filament.
P5 slender and composed of 5 segments on each side; distal segment of right leg slender and long; terminal segment of left leg short, and truncated at the distal margin which is furnished with 2 apical spines of equal lengths, and short hairs on the outer margin.

Planche 2 Issued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XXXVII, figs.10-18].
Female: 10, habitus (dorsal); 11, idem (lateral left side); 12, Mx2; 13, Mxp; 14, P1; 15, P2; 16, P3 (exopod missing); 17, P4; 18, P5.

Planche 3 issued from : O. Tanaka in Publ. Sero Mar. Biol. Lab., 1960, VIII (1). [p. 98].
Male: Proportional lengths of segments of A1.

Nota: A1 reaches back to the distal margin of the 2nd abdominal segment; segments 8 to 12 and 13-14 fused, segmets 20-21 fused on the right side.