NEW GENUS OF COPEPOD CRUSTACEAN. 465 
The fifth appendages (first maxillipedes) are three-jointed, 
the terminal joint being a curved claw. ‘They are the smallest 
of the three pairs of clawed appendages. 
The sixth appendages (second maxillipedes) are the longest of 
the head appendages. There are four segments, the terminal 
one having the form of a sharp claw and being incompletely 
divided across. 
The four pairs of thoracic appendages are biramous, but very 
small. The outer ramus is two-jointed, the proximal being 
larger than the distal joint. The jointing is not well marked in 
the two posterior pairs. Three or four short sete occur at the 
tip of each outer ramus. 
The inner rami, which arise from a basal ridge at a little 
distance from the outer rami, are also two-jointed. In the first 
thoracic appendages the distal joint is larger than the proximal 
and bears a few sete. There is a papilla on the basal segment 
of the appendage lying to the inner side of the inner ramus. 
In the secoud pair the distal joint is larger than the proximal 
znd has no sete. In the third and fourth pairs the terminal 
joint is much smaller than the proximal and is incompletely 
divided from it. It has no sete. 
The genus falls naturally within the family Ascomyzontide. 
Jt differs from Nicothoé, Aud., in having the mouth set on 
a conical projection. It resembles Ascomyzon, Thorell, and 
Uperogcos, Hesse, in having five joints to the second cephalic 
appendages, and differs from Asterocheres, Boeck, which has four 
joints, and from Dyspontius, Thorell, Artotrogus, Boeck, Platy- 
thorax, Hesse, and Ceratrichodes, Hesse, which have three. 
It differs from Uperogcos and resembles Ascomyzon in that the 
oral cone is long and the second cephalic appendages are not 
antenniform; but it differs from: Ascomyzon in that the first 
cephalic appendages are of moderate length and indistinetly 
segmented, whereas in Ascomyzon they are long and 20-jointed. 
The extreme reduction of the four pairs of thoracic appen- 
dages is doubtless intimately associated with the swelling of the 
thorax, and is probably not shared by the male. 
