156 BRITISH COPEPODA. 
2. Zaus Goopsiri, Brady. Pl. LXVI, fig. 1O—138. 
Zaus ovalis, Claus. Die frei-lebenden Copepeden, p. 146, tab. xxii, 
fig. 18, and tab. xxiii, figs. 11—18 (1863). 
Body elongated, depressed, sub-pyriform, first seg- 
ment about one third the length of the animal; 
rostrum large, much broader than long, slightly 
rounded in front ; abdomen narrower than the cephalo- 
thorax. Anterior antennz slender and tapering, 
9-jointed; first, second, and third joints longest and 
sub-equal, fourth and sixth much shorter and nearly 
equal, the rest minute; the male anterior antenna (fig. 
11) is stouter, less tapered, and more profusely setose at 
the apex, the fifth and sixth joints small and con- 
stricted, the seventh somewhat swollen, but not 
vesiculated. Posterior antenne and mouth-organs not 
materially different from those of Z. spinatus. Swim- 
ming feet also like those of Z. spinatus, except that 
the terminal claws of the inner branch of the first pair 
are much more slender and longer (fig. 12). Outer 
segment of the fifth pair of feet in the female (fig. 13) 
elongated, subovate, margins hispid, apex bearing five 
plumose setze; inner segment almost obsolete, bearing 
four sete, one of which is long and plumose; in the 
male, the inner portion is entirely wanting. The 
abdomen gradually tapers backwards, and the posterior 
angles of its first two segments, as well as all those of 
the cephalothorax, are much produced and acutely 
