A TRIP.TO LAKE »HAUROTO. I19 
which is obliquely truncate, and set in a pectinate manner with 
slender teeth ; palp large and elongated, almost straight, bearing 
on its inner side very numerous long, pectinately-arranged sete, 
which stretch backwards as in the feet of the Sidide. First 
pair of jaws bearing at the base a very large branchial plate, 
which is beset with numerous ciliated marginal sete, incisive 
portion divided into 3 setiferous lobes; palp very large, scarcely 
articulated ; the posterior margin slightly lobated, inner margin 
pectinately setose, like the mandibular -palp, but smaller, 
Second pair of jaws membranaceous, bearing, like the preceding 
pair, a branchial plate, but smaller and narrower ; distal portion 
subovate, beset with a few ciliated sete, and in the male 
furnished with a very large and_ strongly hatchet-shaped 
appendage adapted for prehension. Third pair of jaws, in the 
female, rudimentary, forming a simple setiferous lobe; in the 
male, strong, distinctly jointed, and subcheliform. Abdomen 
beset behind with several bundles of long sete for supporting 
the ova. Postabdominal lamine narrow, slightly dilated at the 
apex, and armed before and behind with several marginal sete 
or spines. Copulative organs of the male very large and 
narrow. 
1. Cytherella polita, G. S. Brady.—Shell of the female, as 
seen from the side, subelliptical, height equal to about % of the 
length ; extremities nearly equal and well-rounded, dorsal 
margin forming a regular flattened arch, ventral nearly straight ; 
seen from above, the outline is ovate-cuneate, widest near the 
hinder extremity, obtusely pointed in front, broadly rounded 
behind, width equal to half the length ; end view broadly oval. 
Surface of the shell perfectly smooth and polished. Length 1-31 
inch. 7 
(Also found in West Indies and mouthof Rio de la Plata, in 
13 fathoms.) 
All the species described in this paper were obtained during 
the stay of the “Challenger” in Wellington Harbour. 
eee OUP AK E PAU ROTO 
({ilustrated by accompanying sketch-map). 
SCO OO 
BY) MR. ROBT. PAULIN. 
es 
Very few residents in, or visitors to New Zealand, have heard 
of the lake described in this paper; and yet most of those who 
are acquainted with the map of the South Island know that in 
its south-west corner is a sort of terra incognita, containing 
among other problematical places a lake, usually named Howloko, 
