496 Dr. J. Allan Thomson—On the Terebratellide. 
of Mte. Cantomoro, Penna, and Scaletta extend south-east, towards 
Varese-Ligure, to Mte. Quatese, Cavallone, Setterano, and Carignone, 
all at about 1,300 metres altitude, in three more or less parallel zones 
with intervening strata of argillaceous schist containing abundant 
lenticular intercalations of diabasic breccia, of which extensive 
agglomerations also appear on the northern flanks of Mte. Penna. 
The diabasic zones obviously represent original submarine lava 
streams flowing in the planes of the plastic sedimentary strata in 
which the débris became infolded and cemented to breccia. 
ConcLusion. 
The phenomena presented by the ophiolithic and sedimentary 
groups of Eastern Liguria are substantially the same as those of 
the Triassic Voltri and the Sestri and Isoverde Eocene groups west 
of Genoa. Both regions afford striking evidence of intense folding, 
crushing, contortion, and brecciation which the sedimentary and 
the ophiolithic rocks of submarine eruptive origin during their 
contemporaneous uprise and subsequent settling experienced alike. 
There is no tangible evidence of these groups being transported areas, 
while everything points to their emergence and location in situ.! 
The effects of repeated earth-movements, including those of a seismic 
character, are strikingly evidenced by the frequently cataclastic 
condition of the Ligurian littoral from the coast to the crest of the 
Apennines, and the compression of the region during its uprise and 
settlement must have been all the greater considering that it lies in 
the contracted semicircular curve of the Gulf of Genoa. 
III.—On tae CrasstFicatTion oF THE J'EREBRATELLID®. 
By J. ALLAN THomson, M.A., D.Sc., F.G.S., Director of the Dominion 
Museum, Wellington, New Zealand. 
Inrropuctron. 
\HE observations presented by Mr. J. Wilfrid Jackson (1916) ? on 
my paper on ‘‘ Brachiopod Morphology”, published in this 
Magazine in 1915, are very welcome as furnishing many important 
details omitted by Davidson and other writers in the description of 
species. The error into which I fell as regards the types of folding 
of Dallina and Dalinella illustrates the danger of relying on figures 
when specimens are not available, but it was worth while making 
such an error when the correction of it brought forward so many 
useful observations on other points, particularly on the prevalence of 
microscopically some of the ophiolithic rocks on the north of the Apennines : 
“Sopra alcune roccie serpentinose dell’Apennino Bobbiese,’’ Boll. R. Com. 
geol., 1881, p. 58 et seq. ; also D. Zaccagna, Relazione, 1902; ibid., 1903, p. 39. 
' Further east towards Spezia the Mesozoic and Tertiary sedimentary strata 
exhibit an abnormal superposition which has always been regarded as an 
extensive inverted fold, but may be the effect of an overthrust. In the 
ophiolithie areas of Eastern Liguria, on the other hand, the Hocene sedimentary 
sequence is normal. 
2 References are given in the list of papers at the end of this article, and are 
indicated in the text by the author’s name and date. 
