154 BRITISH COPEPODA. 
Zaus spinosus, Claus. Die frei-lebenden Copepoden, p. 146, 
taf. xxli, fig. 25; taf. xxiii, figs. 1—10 (1863). 
— _ Boeck. Oversigt Norges Copepoder, p. 40 (1864). 
Cephalothorax much expanded, the posterior lateral 
angles of the various segments produced and overlap- 
ping; abdomen considerably narrowed and constricted 
at the base; margins of the first body-segment beset 
with a few short rigid projecting sete; integument 
simple, not pitted nor perforated. Anterior antenne 
slender, shorter than first body-segment, 9-jointed; first 
joint short, third much the longest, second and fourth 
shorter and nearly equal; last five joints minute; the 
whole limb clothed with rather short setz: posterior 
antennee (fig. 3) 2-jointed, the first jomt bearing a 
small 2-jomted inner branch; the second terminating 
in four geniculated setz and three spines, each of 
which bears a brush-like appendage composed of 
radiating tactile (P) filaments (fig. 4). Mandibles 
(fig. 5) small; palp composed of a basal joint and two 
small setiferous branches. Maxille and first pair of 
foot-jaws small. Second pair of foot-jaws (fig. 7) 
small, the hand quadrate and bearing two small and 
thick, crooked claws. Tirst pair of feet (fig. 8) 2- 
branched, inner branch short, terminal joint very 
small and bearing one or two claws, one of which is 
minute ; outer branch 3-jointed, the median joint small 
and indistinctly separate ; last joint dilated at the apex, 
and bearing four slender falciform claws, the inner mar- 
gins of which are beset with comb-like rows of minute 
sete. The three following pairs of feet are 2-branched, 
each branch being 3-jointed, the terminal joint of each 
