Planche 1 issued from : G.O. Sars in An Account of the Crustacea of Norway, with short descriptions and figures of all the species, 1921 a, 8. [Pl. X, 1].
Male (from Norway). gen.sv, genital segment (ventral).

Nota: Ventral face of the cephalic segment forming anteriorly a rather prominent gibbous convexity, but without any distinctly marked oral tubule.
Eye inconspicuous.
A1 5-segmented, about equalling in length 2/3 of the cephalic segment; the last segment very movably articulated to the preceding one, and somewhat knife-shaped, with the inner edge divided at the extremity into 5 small recurved denticles
P5 wholly absent.
Abdomen 4-segmented, the 1st of which is produced below to a sub-clavate copulative appendage provided at the end on each side with a short auriculiform lobe.
Caudal rami comparatively small and somewhat divergent, each having the form of a rounded oval lamella edged with 5 subequal setae.