Procerite

Merocerite or second joint also furnished with a few yellow hairs, like the carpocerite; terminal filament or procerite a little shorter than the carapace, multiarticulate and provided with long yellow verticilated hairs.

a third, fourth, and fifth joints, narrower than the preceding, and called respectively the ischiocerite, merocerite and carpocerite, and articulated with the last an extremely long many-jointed flagellum or procerite.

In this genus, the basicerite, ischiocerite, and merocerite are much thicker and stronger than the corresponding joints of any of the other appendages; and in the closely allied Scyllarus, the facial region of which is, on the whole, similarly constructed, these joints become extremely expanded and flattened, and are succeeded by no procerite.

There is a large tuft of tactile setæ at the base of the procerite, and a few are continued from that point down the outer margin of the carpocerite; but all the setæ below that point on the upper surface are fringing setæ, as that part is covered by the antennules and the squame.