W. H. Leigh-Sharpe 
125 
Generic characters. 
Female. Cephalothorax distinctly separated from the trunk, long, vermi¬ 
form, slender, arched posteriorly to the body axis, and unprovided with a 
dorsal carapace. No abdominal appendages, or anal laminae; the abdomen 
reduced to an unpaired genital process ventral to the anus. ls£ antennae, 
three jointed. 2nd antennae , uniramose, turned inwards towards each other 
across the frontal margin of the head, and often meeting and even overlapping 
in the middle line. 1st maxillae, bipartite with a palp. 2nd maxillae, entirely 
fused, very short (sometimes absent in some spp.). Maxillipedes, stout with 
terminal claw, usually with an accessory claw on the inner margin. 
Male. Cephalothorax and trunk fused and folded together ventraliy into 
an unsegmented Cyprian ovoid, without distinction of parts. No dorsal 
carapace or abdominal appendages. ls£ antennae two jointed. 2nd antennae, 
uniramose and three jointed. ls£ maxillae, bipartite, without palp. 2nd 
maxillae and maxillipedes close to mouth tube, and strongly clawed. Between 
the maxillipedes in the median line, a short rounded mediative process 
homologous with the paired structures similarly situated in the males of 
Lernaeopoda. All the appendages point diagonally and forwards. 
Specific characters. 
Female. Cephalothorax much longer than the trunk but not deflected 
backwards so as to touch it. The base of the neck differentiated into a 
globular swelling, where it is distinctly separated from the trunk. Trunk 
definitely longer than wide. 2nd maxillae short, completely fused, ending in 
a disc not quite on the body to which is attached a horn-coloured spherical 
bulla. The mandibles are entirely dissimilar from those figured of other 
species. Ovisacs long, nearly twice as long as the trunk. Genital process 
present. 
There is no species hitherto described which combines all these characters, 
C. uncinata (0. F. Muller), which is also found on Gadoid fishes perhaps 
approximating most nearly, but that not very closely. The American species 
C. inna Wilson, likewise parasitic on Gadoids, approaches the present species 
in those points in which it differs most from C. uncinata. 
The following table gives a comparison between these three species: 
Cephalothorax 
Head 
Base of neck 
Trunk 
C. sciathcrica 
Much longer than trunk 
Not enlarged 
Differentiated 
Nearly spherical, but a 
little longer than wide 
Short, with a flat disc as 
well as a spherical 
bulla 
C. uncinata 
The same length or but 
little longer than the 
trunk 
Not enlarged 
Not differentiated 
Wider than long 
C. i r ina 
Longer than the trunk 
Not enlarged 
Not differentiated 
Much longer than wide 
Moderately short, bulla 
small and clavate 
2nd maxillae 
Short, bulla spherical 
