304 Transactions.—Zoology. 
and probably attracted by the radiated heat; and the extremely ragged 
state of the wings of so many specimens may possibly be accounted for by 
the sharp edges of the stones cutting them as the butterflies are driven 
along by the strong winds. 
I am indebted to my friend, Mr. J. D. Enys, of Castle Hill Station, for 
the first specimens that came into my possession. 
I have already recorded the discovery of this species (‘‘ Trans. N.Z. 
Inst.,” Vol. IV., p. 217), and named it “ Pluto,” at the same time placing 
it in the genus Brebia, but having since ascertained that such name had 
been previously appropriated to another butterfly, I have substituted the 
specific name of “ Othello,’ and finding that Professor Westwood dis- 
tinguishes the genus Oreina from Frebia, and other genera of the family 
by the former having none of the nervures of the wings dilated, I have now 
placed this species under that genus. 
Art. XXXVII.—On the Mollusca of Auckland Harbour. 
By T. F. Cuaezseman, F.L.S. 
[Read before the Auckland Institute, 14th June, 1875.) 
Tue publication of Captain Hutton’s excellent catalogue of the Marine 
Mollusea of New Zealand has afforded me an opportunity of naming the 
shells which, for some years past, I have collected in and about Auckland 
Harbour. While engaged in this work, it occurred to me that a list of the 
species noticed, together with a few cursory remarks, might be of some 
value as a contribution towards the question of the geographical range of 
our shells ; a point on which very little appears to be known. With this 
view I have prepared the following sketch, which I have now the pleasure 
to submit to the notice of the Institute. : 
For the purposes of this paper, I shall consider Auckland Harbour to 
extend in a northerly and easterly direction as far as Rangitoto and Brown’s 
Island, and to be bounded on the west by a line drawn from Kauri Point to the 
mouth of the Whau River. From the great irregularity in the coast line— 
large bays and inlets stretching back for considerable distances—it is diffi- 
cult to estimate the area with any approach to exactness, but it is probably 
not less than eighteen square miles. The depth is nowhere very great: an 
irregularly shaped depression between the North Head and the Bean Rock 
Lighthouse exceeds fifteen fathoms, and off Stokes’ Point a narrow channel, 
with a depth of from twelve to thirteen fathoms extends for a considerable 
distance. No part of Rangitoto Channel, however, exceeds eight fathoms, 
and the broadest part of the harbour—that between the Tamaki Heads 
x 
E 
