154 BRITISH COPEPODA. 



Zaus spinosus, Claus. Die frei-lebenden Copepoden, p. 146, 



taf. xxii, fig. 25 ; taf. xxiii, figs. 110 (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 set 83 ; integument 

 simple, not pitted nor perforated. Anterior antennas 

 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 setae : posterior 

 antennae (fig. 3) 2- jointed, the first joint bearing a 

 small 2- jointed inner branch ; the second terminating 

 in four geniculated setae and three spines, each of 

 which bears a brush-like appendage composed of 

 radiating tactile (?) filaments (fig. 4). Mandibles 

 (fig. 5) small ; palp composed of a basal joint and two 

 small setiferous branches. Maxillae 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. First 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 

 setae. The three following pairs of feet are 2-branched, 

 each branch being 3-jointed, the terminal joint of each 



