ZAUS. 153 



The form of the lower foot-jaw and the 8-jointed an- 

 terior antenna separate this species distinctly from H. 

 chelifer. In other respects the two are closely similar, 

 H. flexus being, however, much more sparingly pro- 

 vided with spines and cilia. This general resemblance 

 may lead to the suspicion that the one is perhaps only 

 an immature form of the other, and but for the totally 

 different form of the lower foot- jaw, one might very 

 readily be led to adopt that view. In some of the 

 localities mentioned above, the species occurred in 

 tolerable abundance. 



Genus 29. ZAUS, Goodsir (1845). 



Body broad and depressed; head distinct from 

 cephalothorax ; rostrum broad and truncate. Anterior 

 antennae 9-jointed ; posterior 2-jointed, inner branch 

 slender, 2-jointed. Mandibles small, palp slender, 

 2-branched. First pair of feet 2-branched ; outer 

 branch indistinctly 3-jointed, the median joint very 

 short ; inner branch 2-jointed, short, last joint rudi- 

 mentary ; ovisac large, adpressed, single. In other 

 respects like Harpacticus. 



1. ZAUS SPINATUS, Goodsir. PI. LXVI, figs. 1 9. 



Zaus spinatus, Goodsir. " On several new species of Crustaceans 

 allied to Saphirina;" Ann. and Mag. Nat. 

 Hist., vol. xvi, p. 326, pi. xi, figs. 18 (1845), 



