G. M. Tuousox.—On the New Zealand Copepoda. 103 
Genus Xouthous, n. gen, 
Body conical, rounded in front. Anterior antenne 7-jointed, geniculate 
in the male; posterior pair with a small 3-jointed secondary branch. Man- 
dibles with a large 2-branched palp. Anterior foot-jaws small, posterior 
rather large and bearing an elongated claw. First pair of feet with the 
inner branch 2-jointed; outer 8-jointed. Next three pairs with both | 
branches 8-jointed ; fifth pair 2-jointed. 
Perhaps this genus should only rank as a sub-genus of Dactylopus, to 
which it is most nearly allied, but besides being very different in its general 
appearance, it differs in the structure of the mandibles, and of the first and 
fifth pairs of feet. 
1. Xouthous nove-zealandia, n. sp. Pl. X., figs. 8-15. 
Body rather short, narrowing posteriorily ; abdomen not very distinctly 
separated from thorax. When seen laterally, the body is flat on the ventral, 
but convexly arched along the dorsal surface. Head merged with first 
segment of thorax. The integument is very dense and opaque, except at 
two spots in the front of the thorax, where it. becomes diaphanous, and pre- 
sents the appearance of two lateral eyes. A red spot at each of these 
lateral eye-spots probably marks a rudimentary eye, while the median eye 
appears to be wanting: if present, it would be useless, on account of the 
opacity of the carapace. The anterior antenne are much shorter than the 
cephalothorax and lie in a groove on its under surface; in the male they 
are strongly geniculated and swollen, and the terminal joints act like an 
opposable thumb or claw; in the female, they are stout at the base and taper 
to the extremity. 
The posterior antenne are strongly developed, as large as the anterior, 
and bear a small, 3-jointed, secondary branch, which is terminated by two 
long slender sete. Mandible-palp forming a two-branched appendage, the 
larger branch bearing two stout plumose spines and two terminal sete. 
Maxille small, (?) palp apparently slender, and bearing two long sete. 
Anterior foot-jaws small, bearing several marginal setose processes. Pos- 
terior pair 2-jointed, terminated by a strong claw; basal joint with a strong 
spine. First pair of feet with inner branch elongated, 2-jointed, first joint 
large, broad at the base and bearing a very long seta, second very short and 
narrow, carrying two long sete, which are jointed near their apex ; outer 
branch 3-jointed, considerably shorter than first joint of inner. Second and 
third pairs of feet with both branches 8-jointed, inner branch the longer, 
the individual joints broader and less setose than those of the outer. 
Fourth pair of feet with both branches 9-jointed, subequal. Fifth pair 
9-branched, outer branch 2-jointed (?), terminal joint bearing five subterminal 
spine-like sete ; inner branch subquadrate, with five sete on its lower margin: 
similar in both sexes. Caudal sete very short. 
