298 Transactions.—Zoology. 
upper portion of body and tail; cleft of mouth very oblique. A single 
dorsal, which, like the anal, is composed of stout spinous rays connected at 
their mid-length by a membrane having a breadth of one-third of their 
length, leaving apertures between the base of the rays. Caudal forked, 
ventrals slender; a single series of minute teeth in the jaws, finely 
pectinate ; branchiostegals four; air-bladder large. 
Discus aureus, sp. n 
B.4, D.26, A.21, V.T, Q/10/5 EJ 
The greatest height of body is two-thirds of length, and is vertical to the 
origin of the dorsal and ventrals; head equal to half height; snout equal to 
half, and interorbital space equal to one quarter 
greatest diameter of orbit, which is equal to 
half length of head; a depression extends down 
the snout; greatest thickness of body above 
the pectorals, and equal to greatest diameter 
of orbit; the upper maxillary extends to the 
vertical, below the centre of the eye; colour 
silvery, with minute bronze spots, with a dorsal margin of a similar 
colour, extending from behind the orbit, where the depth equals half 
orbit, to the caudal; pectorals yellowish brown, others dirty white. 
Total length, 23in. 
Four specimens cast up on Hokitika beach. 
Arr. XXVIIL — Notes on the Genus Callorhynchus, with a Description of an 
undescribed New Zealand Species. By W. Corzwso, F.L.S. 
Plate XVII. 
[Read before the Hawke Bay Philosophical Institute, 12th August, 1878.] 
Ix a “Catalogue of the Fishes of New Zealand with Diagnoses of the 
Species," compiled by Captain Hutton and printed for the Colonial Museum 
in 1872, only one species of the genus Callorhynchus 1s mentioned as belong- 
ing to our seas—C. antarcticus ; but, as I take it, there are several other 
species, two of which I have seen, viz., C. australis, Hobson, and an 
undescribed one, which I believe to be a species nova (C. dasycaudatus, 
mihi), of which I shall give a fair diagnostic and specific outline in this 
paper. 
It was in December, 1844, that I first saw this fish. I was leaving 
Poverty Bay in a brig, bound for this place, when, on passing the heads, 
we saw some Maori canoes fishing, one of which paddled alongside and sold 
us some of their fish they had just taken ; among them was one that I had 
