PRESIDENT’S ADDRESS—SECTION C. 65 
II. Laren Tertrary.—No new European elements appear, 
though Ostrea Angas: and Saxicava australis may possibly be 
of European origin. 
III. Miocene.—Sazicava australis and Limopsis aurita are 
the only named species which are European ; the latter is a very 
questionable identification (see post). 
IV. Eocunse.—The possible European identities, recent or 
fossil, which have been named are Aturia zic-zac, Xenophora 
agglutinans, Limopsis aurita, and Saxicava arctica. M‘Coy, 
in describing the Australian Auturia, indicated certain differential 
characters from A. zie-zac, and apphed the varietal name, «aus- 
tralis, to it. Subsequent studies by Mr. Newton show that the 
Australian fossil is more related to A. Parkinsoni than to 
A, zic-zac, and that it is a distinct species. The Australian Xeno- 
phora has been shown by Cossmann, and afterwards by Harris 
(Austral. Tert. Moll., Brit. Mus. publication, 1897), to be distinc- 
tive, though trivially, but consistently, from X. agglutinans of 
the European Eocene. Limopsis aurita, so determined by 
M‘Coy is, on the authority of M. Cossmann, not that species at 
all; I regard it as a varietal form of LZ. ensolita, common to the 
Eocene of Southern America, New Zealand, and Australia. The 
community of species is thus reduced to the protean shell, 
Sazxtcava arctica, which embodies the characters of many sub- 
species ranging from the Eocene to the present day, and which 
by a little elasticity in the application of our methods for 
specific determination, might reasonably be regarded as species, 
though falling within the range of variation, as regards shape, 
ornament, and size, presented by the living S. arctica. 
V. Creractous.—The only specific identities, if at all, are 
restricted to one or two species of /noceramus. 
VI. Jurassic.—Mr. Charles Moore (Journ. Geol. Soc., vol. 
xxvi., 1870), in his elaboration of the Jurassic fauna of West 
Australia, admitted many species of mollusca common to Eng- 
land and this antipodean development. My many years’ intimacy 
with the late Mr. Moore, and from actual knowledge of the Aus- 
tralian material which he possessed have compelled me, since my 
advent in Australia, to express publicly that Mr. Moore had not 
been critical enough in his comparisons to permit of the applica- 
tion of the names of so many European species to the Australian 
constituents of the Jurassic fauna. This exercise of caution has 
been justified by the results of the subsequent treatment of the 
Cephalopoda by Mr. Crick (Geol. Mag., 1894), in which all the 
European names of the Ammontidee are set aside, and in some 
cases the similitudes are referred to different genera. 
It does not necessarily follow that a re-examination of the 
assumed identical species of the other mollusca would share the 
E 
