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. fleeus 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 
antennze 9-jointed ; posterior 2-jointed, inner branch 
slender, 2-jomted. 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 jot rudi- 
mentary ; ovisac large, adpressed, single. In other 
respects lke Harpacticus. 
1. Zaus spinatus, Goodsiv. Pl. 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, pl. xi, figs. 1—8 (1845), 
