( 333 ) 
XVIII.—The Marine Mollusca of the Scottish National Antarctic Expedition, By 
James Cosmo Melvill, M.A., D.Sc., F.L.S., and Robert Standen, Assistant 
Keeper, Manchester Museum. Communicated by Dr W. 8. Bruce. (With 
One Plate.) 
(MS. received April 24,1912. Read June 3, 1912. Issued separately August 26, 1912.) 
PAARL I 
Brine A SUPPLEMENTARY CATALOGUE. 
Since we had the pleasure of working out the Mollusca obtained by the Scottish 
National Antarctic Expedition, Dr W. 8. Bruce has kindly transmitted to our care 
some additional material, overlooked in the first instance, and taken (a) from deposits 
from jars in which Sponges were placed ; (b) from Ale and other growths, principally 
coming from Scotia Bay ; and (c) from a new species of Cephalodiscus. 
Of these the last, when macerated out and closely examined, produced the most 
prolific and interesting results; but, notwithstanding this fact, the condition of many 
of the specimens extracted leaves much to be desired, so fragmentary and useless for 
scientific purposes was a very large proportion found to be. A certain few, however, 
are happily in better condition and recognisable, and, of these, we find several to have 
been described by Dr Hermann Srrepet of Hamburg in 1908, the year subsequent 
to our first paper upon the subject being published. 
Others remain, of which over twenty do not appear to be represented in the collec- 
tions to which we could obtain access, nor mentioned in any of the treatises yet published 
on the Antarctic fauna. We are therefore emboldened to consider them new to science 
in the accompanying supplementary catalogue. 
We include afresh in the list of species obtained by this expedition those already 
catalogued in our first paper, thus rendering it as complete as possible, and signalise 
with an asterisk (*) those which are amongst the addenda now chronicled. 
We would thank Mr Epcar Suir, I.8.0., for having examined some of the material, 
and likewise would express our indebtedness to the Rev. Lewis J. SHACKLEFORD, Messrs 
B. R. Lucas and J. Witrrip Jackson, F.G.S8., for having aided us in the difficult task 
of extracting such small and fragile objects from the mass in which they were too often 
almost hopelessly embedded. Mr T. Irepats has also kindly drawn up the description 
of a new species of Chetopleura for this paper. 
We would only add that we have extended the Bibliographical Catalogue of the 
Antarctic Mollusean Fauna from 1907 to 1912 at the end of this enumeration. 
TRANS. ROY. SOC. EDIN., VOL. XLVIII., PART II. (NO. 18). \ 51 
