NEW ZEALAND COPEPODA. 39 
dorsal margin; surfaces of the shell variously sculptured, punc- 
tate, papillose, reticulated, or transversely rugose; ventral surface 
produced laterally into a prominent, rounded or spinous ala ; 
posterior margin produced into a more or less distinct but obtuse 
beak ; hinge formed by 2 small terminal teeth on the right, and 
by a minutely crenated median bar on the left valve. Muscle- 
spots usually 4, linear-oblong, arranged in an obliquely transverse 
row just above the middle of the ventral margin. Anterior- 
antenne shortly setiferous, and composed of 5 joints; the pen- 
ultimate joint elongated, and bearing on the middle of the 
anterior margin 2 hairs; posterior antennz distinctly 5-jointed, 
flagellum long. Mandibles of moderate size; palp 3-jointed, 
branchial appendage bearing 2 very small sete. Terminal lobes 
of first pair of maxilla long or narrow ; branchial plate bearing 
on its external margin two non-ciliated setz, which are directed 
downwards, and arise from a separate lobe. Feet long and 
slender, with slender terminal claws. Abdomen ending in a 
long, narrow process ; postabdominal lobes bearing 3 short hairs. 
Copulative organs of the male armed behind with 3 spiniform 
processes, one of which is 3-furcate; eyes wanting. 
1. Cytheropteron wellingtoniense, G. L. Brady.—Shell, seen from 
the side, flexuous in outline, subrhomboidal, highest in the middle, 
height equal to nearly two-thirds of length, anterior extremity 
depressed, rounded off, posterior wider, looking obliquely downward, 
produced in the middle into ashort, broad, and obtuse beak, dorsal 
margin boldly and evenly rounded, ventral convex, sinuated in 
front and behind the middle; seen from above, the outline is 
subovate, widest behind the middle, where the latter alz project 
only very slightly ; from this point the lateral margins slope with 
a gentle curve towards the anterior extremity, which is obtuse 
and slightly mucronate, more abruptly and almost in a straight 
line to the hinder extremity, which is acuminate ; width equal 
to the height ; the end view is equilaterally triangular, the angles 
rounded, and the lateral margins rather boldly curved, ventral line 
nearly straight. The shell is almost smooth, but marked on parts 
of its surface with closely set minute puncta, the ventral surface 
is indented longtitudinally along the median line, and bears also 
a few curved striz-; the lateral alze are curved, scarcely angular, 
and but slightly prominent. Length 1-43rd inch. 
(To be continued.) 
